International Journal of Mining Science and Technology最新文献_第6页

Dynamic multifractal characteristics and damage evolution of granite pegmatite with varying biotite content based on acoustic emission monitoring 基于声发射监测的不同黑云母含量花岗岩伟晶岩动态多重分形特征及损伤演化

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-12-01 DOI: 10.1016/j.ijmst.2025.09.012

Shuowei Liu , Jianjun Zhao , Bin Shi , Qiyi Lai , Qingmiao Li , Jianxian He , Xiao Zhao , Jie Deng , Xuejin Ying

Biotite content critically influences rock mechanical behavior and threatens underground engineering stability. Uniaxial compression tests with acoustic emission (AE) monitoring were conducted on granite pegmatite samples having varying biotite content. Peak frequency distribution analysis, rise angle-average frequency (RA-AF) analysis, multifractal theory, and a dynamic multifractal algorithm were applied to explore the relationship between damage evolution and AE characteristics. Results indicate that increased biotite content reduces uniaxial compressive strength and elastic modulus, enhances plastic deformation, and increases the proportion of shear cracks. The segmented evolution of the dynamic multifractal parameter

{Δ α}_{m}

is biotite-dependent. Oscillations during the elastic phase signify localized shear crack initiation and propagation; their attenuation in the plastic phase reflects frictional closure along biotite cleavage planes, promoting elastic energy storage and delaying release. AE-based damage models and time-varying signals characterize rock damage progression. Stress concentrations around biotite minerals foster localized shear band formation, leading to concentrated shear failure at lower damage levels. Higher biotite content accelerates crack propagation, while smooth cleavage planes lower the fracture energy threshold, reducing strength and stiffness. These findings enhance understanding of biotite-influenced progressive rock damage and underpin stability monitoring and early-warning systems for underground engineering.

黑云母含量对岩石力学行为有重要影响，威胁地下工程的稳定。对不同黑云母含量的花岗伟晶岩样品进行了声发射监测的单轴压缩试验。应用峰值频率分布分析、上升角-平均频率（RA-AF）分析、多重分形理论和动态多重分形算法探讨损伤演化与声发射特征之间的关系。结果表明：增加黑云母含量降低了单轴抗压强度和弹性模量，增强了塑性变形，增加了剪切裂缝的比例；动态多重分形参数Δαm的分段演化依赖于黑云母。弹性阶段的振荡表明局部剪切裂纹的萌生和扩展；它们在塑性阶段的衰减反映了沿黑云母解理面的摩擦闭合，促进了弹性能的储存和延迟释放。基于ae的损伤模型和时变信号表征了岩石损伤过程。黑云母矿物周围的应力集中形成局部剪切带，导致较低损伤水平的集中剪切破坏。较高的黑云母含量加速了裂纹扩展，而光滑的解理面降低了断裂能阈值，降低了强度和刚度。这些发现增强了对黑云母影响的岩石渐进损伤和地下工程基础稳定性监测预警系统的认识。

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引用次数: 0

Effect of reservoir temperature and water driving pressure on dynamic behavior of geothermal reservoirs under production loads 采油负荷下储层温度和水驱压力对地热储层动态特性的影响

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-12-01 DOI: 10.1016/j.ijmst.2025.09.004

Yide Guo , Cheng Zhai , Xibing Li , Ming Tao , Linqi Huang , Yangchun Wu

The safe and efficient development of geothermal energy is a key driver of the energy revolution and environmental governance in this century. To understand the effect of water driving pressure on drilling safety and hydraulic fracturing efficiency during the development of geothermal energy under varying reservoir temperatures, dynamic compression tests were conducted on granite samples subjected to thermal treatment (25, 100, 200, 300, 400 and 600 °C) and subsequent forced water absorption (0, 4, 8, 12 MPa) using a split Hopkinson pressure bar system. The results indicate that a higher water driving pressure exacerbates the deterioration of dynamic compressive strength with increasing temperature, while it enhances the rate dependence of dynamic compressive strength, except at 600 °C. The dynamic increase factor (DIF) of dynamic compressive strength vs. strain rate is determined by both temperature and water driving pressure. A prediction model for the deterioration of dynamic compressive strength considering reservoir temperature and water driving pressure is proposed for geothermal reservoirs. While the splitting failure of samples remains unchanged, crack density increases with increasing temperature and water driving pressure, exhibiting multiscale failure cracks parallel to the loading direction. The structure effective strength model, the wing-crack propagation model, the effect of pore water pressure on dynamic stress intensity factor, and the dynamic response of forced absorbed water can collectively reveal the response mechanisms of dynamic strength. Based on the experimental findings, implications for safe and productive geothermal energy development are discussed, with particular attention to the effect of drilling fluid leakage on wellbore stability and the impact of residual fracturing fluid after backflow on repeated fracturing. This study has important reference value for understanding dynamic wellbore stability under drilling disturbance loads and for the design of repeated dynamic hydraulic fracturing schemes in geothermal energy development.

安全高效地开发地热能是本世纪能源革命和环境治理的关键驱动力。为了解不同储层温度条件下水驱压力对地热能源开发过程中钻井安全性和水力压裂效率的影响，采用分离式霍普金森压杆系统，对花岗岩试样进行了25、100、200、300、400和600℃的热处理和0、4、8、12 MPa的强制吸水试验。结果表明：除600℃外，较高的水驱压力加剧了动抗压强度随温度升高的劣化，增强了动抗压强度的速率依赖性；动态抗压强度随应变速率的动态增长因子（DIF）由温度和水驱动压力共同决定。提出了考虑储层温度和水驱压力的地热储层动态抗压强度劣化预测模型。试样的劈裂破坏保持不变，但裂纹密度随温度和水驱动压力的升高而增大，呈现平行于加载方向的多尺度破坏裂缝。结构有效强度模型、翼裂扩展模型、孔隙水压力对动应力强度因子的影响以及强制吸水水的动态响应可以共同揭示动强度的响应机理。在此基础上，讨论了地热能源安全高效开发的意义，重点讨论了钻井液泄漏对井筒稳定性的影响以及返排后残余压裂液对重复压裂的影响。该研究对于认识钻井扰动载荷下井筒动态稳定性，以及地热能开发中重复动态水力压裂方案的设计具有重要的参考价值。

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引用次数: 0

Viscoelasticity-enhanced stability and ice-breaking performance of submerged water jet at long standoff distances 粘弹性增强水下射流远距离稳定性和破冰性能

IF 11.8 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-11-27 DOI: 10.1016/j.ijmst.2025.10.012

Hongwei Zhang, Binbin Ge, Zhaolong Ge, Qiuxu Hu, Jinming Cui, Sen Wen, Qinglin Deng

引用次数: 0

A sediment sampling system for monitoring plume redeposition from deep-sea polymetallic nodule mining 用于监测深海多金属结核开采羽流再沉积的沉积物采样系统

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-11-01 DOI: 10.1016/j.ijmst.2025.08.010

Jiale Wu , Jiawang Chen , Xinghui Tan , Kaichuang Wang , Jianling Zhou , Zhangyong Jin , Congchi Huang , Yuan Lin , Chunsheng Wang , Junyi Yang , Shiquan Lin

The spatiotemporal characterization of plume sedimentation and microorganisms is critical for developing plume ecological monitoring model. To address the limitations of traditional methods in obtaining high-quality sediment, a novel sampling system with 6000 m operational capability and three-month endurance was developed. It is equipped with three sediment samplers, a set of formaldehyde preservation solution injection devices. The system is controlled by a low-power, timing-triggered controllers. To investigate low-disturbance rheological mechanisms, gap controlled rheological tests were conducted to optimize the structural design of the sampling and sealing assembly. Stress-controlled shear rheological tests were employed to investigate the mechanisms governing yield stress in sediments under varying temperature conditions and boundary roughness. Additionally, the coupled Eulerian-Lagrangian (CEL) method and sediment rheological constitutive models were employed to simulate tube-soil interaction dynamics and sediment disturbance. The radial heterogeneity of sediment disturbance and friction variation of the sampling tube were revealed. The tube was completely “plugged” at a penetration depth of 261 mm, providing critical data support to the penetration depth parameters. The deep-sea pressure test and South China Sea field trials demonstrated the system’s capability to collect and preserve quantitative time-series sediment samples with high fidelity.

烟柱沉积和微生物的时空特征是建立烟柱生态监测模型的关键。为了解决传统方法在获取高质量沉积物方面的局限性，开发了一种具有6000米操作能力和3个月续航时间的新型采样系统。配有沉积物取样器3台，甲醛保存液注入装置1套。该系统由低功耗定时触发控制器控制。为了研究低扰动流变机理，进行了间隙控制流变试验，以优化采样和密封组件的结构设计。采用应力控制剪切流变试验研究了不同温度条件和边界粗糙度下沉积物屈服应力的控制机制。此外，采用欧拉-拉格朗日（CEL）耦合方法和泥沙流变本构模型模拟管土相互作用动力学和泥沙扰动。揭示了沉积物扰动的径向非均质性和采样管的摩擦变化。钻进深度为261mm时，管柱完全“堵塞”，为钻进深度参数提供了关键数据支持。深海压力测试和南海现场试验表明，该系统能够高保真地收集和保存定量时间序列沉积物样品。

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引用次数: 0

A PCM-based active temperature-preserved coring method for deep sea natural gas hydrate 基于pcm的深海天然气水合物主动保温取心方法

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-11-01 DOI: 10.1016/j.ijmst.2025.08.012

Han Wu , Yunqi Hu , Chenghang Fu , Ling Chen , Zhiqiang He , Meng Xu , Heping Xie

Natural gas hydrate (NGH) has a bright future as a clean energy source with huge reserves. Coring is one of the most direct methods for NGH exploration and research. Preserving the in-situ properties of the core as much as possible during the coring process is crucial for the assessment of NGH resources. However, most existing NGH coring techniques cannot preserve the in-situ temperature of NGH, leading to distortion of the physical properties of the obtained core, which makes it difficult to effectively guide NGH exploration and development. To overcome this limitation, this study introduces an innovative active temperature-preserved coring method for NGH utilizing phase change materials (PCM). An active temperature-preserved corer (ATPC) is designed and developed, and an indoor experimental system is established to investigate the heat transfer during the coring process. Based on the experimental results under different environment temperatures, a heat transfer model for the entire ATPC coring process has been established. The indoor experimental results are consistent with the theoretical predictions of the heat transfer model, confirming its validity. This model has reconstructed the temperature changes of the NGH core during the coring process, demonstrating that compared to the traditional coring method with only passive temperature-preserved measures, ATPC can effectively reduce the core temperature by more than 5.25 °C. With ATPC, at environment temperatures of 15, 20, 25, and 30 °C, the duration of low-temperature state for the NGH core is 53.85, 32.87, 20.32, and 11.83 min, respectively. These findings provide new perspectives on temperature-preserving core sampling in NGH and provide technical support for exploration and development in NGH.

天然气水合物作为一种储量巨大的清洁能源，有着广阔的发展前景。取心是天然气水合物勘探和研究最直接的方法之一。在取心过程中尽可能地保留岩心的原位性质对天然气水合物资源的评价至关重要。然而，现有的天然气水合物取心技术大多不能保持天然气水合物的原位温度，导致获得的岩心物性发生畸变，难以有效指导天然气水合物勘探开发。为了克服这一限制，本研究引入了一种利用相变材料（PCM）的天然气水合物有效保温取心方法。设计并研制了主动保温罩（ATPC），建立了室内实验系统，对取心过程中的传热进行了研究。根据不同环境温度下的实验结果，建立了ATPC取心全过程的传热模型。室内实验结果与传热模型的理论预测一致，证实了模型的有效性。该模型重构了天然气水合物取心过程中岩心温度的变化，结果表明，与传统的被动保温取心方法相比，ATPC可有效降低岩心温度5.25℃以上。采用ATPC，在环境温度为15、20、25和30℃时，天然气水合物岩心低温状态持续时间分别为53.85、32.87、20.32和11.83 min。这些发现为天然气水合物保温岩心取样提供了新的思路，为天然气水合物勘探开发提供了技术支持。

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引用次数: 0

Multi-scale damage and fracture analysis and statistical damage constitutive model of shallow coral reef limestone based on digital core 基于数字岩心的浅层珊瑚礁灰岩多尺度损伤断裂分析及统计损伤本构模型

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-11-01 DOI: 10.1016/j.ijmst.2025.06.010

Yingwei Zhu , Xinping Li , Zhengrong Zhou , Dengxing Qu , Fei Meng , Shaohua Hu , Wenjie Li

Coral reef limestone (CRL) constitutes a distinctive marine carbonate formation with complex mechanical properties. This study investigates the multiscale damage and fracture mechanisms of CRL through integrated experimental testing, digital core technology, and theoretical modelling. Two CRL types with contrasting mesostructures were characterized across three scales. Macroscopically, CRL-I and CRL-II exhibited mean compressive strengths of 8.46 and 5.17 MPa, respectively. Mesoscopically, CRL-I featured small-scale highly interconnected pores, whilst CRL-II developed larger stratified pores with diminished connectivity. Microscopically, both CRL matrices demonstrated remarkable similarity in mineral composition and mechanical properties. A novel voxel average-based digital core scaling methodology was developed to facilitate numerical simulation of cross-scale damage processes, revealing network-progressive failure in CRL-I versus directional-brittle failure in CRL-II. Furthermore, a damage statistical constitutive model based on digital core technology and mesoscopic homogenisation theory established quantitative relationships between microelement strength distribution and macroscopic mechanical behavior. These findings illuminate the fundamental mechanisms through which mesoscopic structure governs the macroscopic mechanical properties of CRL.

珊瑚礁灰岩（CRL）是一种独特的海相碳酸盐岩地层，具有复杂的力学性质。本研究通过实验测试、数字核心技术和理论建模相结合的方法研究了CRL的多尺度损伤与断裂机制。在三个尺度上表征了两种具有不同介观结构的CRL类型。宏观上，CRL-I和CRL-II的平均抗压强度分别为8.46和5.17 MPa。细观上，crl - 1具有小尺度的高连通孔隙，而crl - 2具有较大的层状孔隙，但连通性较差。微观上，两种CRL基质在矿物组成和力学性能上表现出显著的相似性。开发了一种新的基于体素平均的数字核心尺度方法，以促进跨尺度损伤过程的数值模拟，揭示了CRL-I的网络渐进破坏与CRL-II的方向脆性破坏。基于数字核技术和细观均质化理论的损伤统计本构模型建立了微单元强度分布与宏观力学行为之间的定量关系。这些发现阐明了细观结构支配CRL宏观力学性能的基本机制。

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引用次数: 0

Mechanism of low-disturbance and high-pressure-retaining sampling of seafloor sediments at 10000-meter depth and its laboratory experiment and on-site sea trials 海底沉积物万米低扰动高压取样机理及室内实验和现场海试

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-11-01 DOI: 10.1016/j.ijmst.2025.06.001

Guangping Liu, Shanqiang Jiang, Yongping Jin, Buyan Wan, Liang Liu, Youduo Peng

Obtaining high-quality 10000-meter-deep seafloor sediment samples is the prerequisite and foundation for conducting deep-sea geological and environmental scientific research. The bottom structure of the deep seafloor is complex, and the physical and mechanical properties and disturbance resistance of sediments of different lithologies vary greatly, so the sediment sampler inevitably disturbs the sediments during the sampling process and affects the quality of the sediment samples. A new type of deep-sea sediment pressure retaining sampler is introduced, the force state and elastic–plastic state of the sampler destroying sediments are analyzed, the radial disturbance model of sediment coring based on the spherical cavity expansion theory is established, and the radius of sediments undergoing plastic deformation around the spherical holes is used as an index for evaluating the radial disturbance of sediments. The distribution of stress and strain fields in the sediments during the expansion of the spherical cavity and the influencing factors of the radius of the radially disturbed region (plastic region) are analyzed using an arithmetic example, and the influence law is analyzed. A sediment disturbance experimental platform was built indoors to simulate the sediment coring process. The radial stress field and pore water pressure of the sediment during the coring process were monitored by sensors arranged inside the sediment, and the results of indoor tests verified the correctness of the perturbation theory model. The sampler was carried aboard the deep-sea manned submersible FENDOUZHE and conducted on-site tests at depths of 9298.4 and 9142.8 m in the Kuril-Kamchatka Trench. Pressure-preserved sediment samples were retrieved, with preservation rates of 94.21% and 92.02%, respectively, which are much higher than the current technical indicator of 80% of pressure-holding ratio for deep-sea sediments. The retrieved sediments have obvious stratification characteristics and little disturbance.

获得高质量的万米深海底沉积物样品是开展深海地质环境科学研究的前提和基础。深海海底底部结构复杂，不同岩性沉积物的物理力学性能和抗扰性差异较大，因此沉积物取样器在取样过程中不可避免地会对沉积物产生扰动，影响沉积物样品的质量。介绍了一种新型深海保压取样器，分析了取样器破坏沉积物的受力状态和弹塑性状态，建立了基于球形孔洞膨胀理论的沉积物取心径向扰动模型，并以球形孔洞周围沉积物发生塑性变形的半径作为评价沉积物径向扰动的指标。通过算例分析了球腔膨胀过程中沉积物中应力场和应变场的分布以及径向扰动区（塑性区）半径的影响因素，并分析了影响规律。在室内搭建泥沙扰动实验平台，模拟泥沙取心过程。通过设置在沉积物内部的传感器对取心过程中沉积物的径向应力场和孔隙水压力进行监测，室内试验结果验证了微扰理论模型的正确性。采样器由深海载人潜水器“分斗浙”号携带，在千岛-堪察加海沟9298.4米和9142.8米深度进行了现场测试。测得压力保存沉积物样品，保存率分别为94.21%和92.02%，远高于目前深海沉积物保压率80%的技术指标。回收的沉积物具有明显的分层特征，扰动较小。

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引用次数: 0

Coupling effect of size and strain rate on uniaxial compressive properties of coral reef limestone 尺寸和应变速率对珊瑚礁灰岩单轴压缩特性的耦合效应

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-11-01 DOI: 10.1016/j.ijmst.2025.07.009

Hongya Li, Linjian Ma, Mingyang Wang, Jiawen Wu, Jiajun Deng, Zeng Li

As the main geomaterials for coral reefs oil or gas extraction and underground infrastructure construction, coral reef limestone demonstrates significantly distinct mechanical responses compared to terrigenous rocks. To investigate the mechanical behaviour of coral reef limestone under the coupling impact of size and strain rate, the uniaxial compression tests were conducted on reef limestone samples with length-to-diameter (L/D) ratio ranging from 0.5 to 2.0 at strain rate ranging from 10⁻⁵·s⁻¹ to 10⁻²·s⁻¹. It is revealed that the uniaxial compressive strength (UCS) and residual compressive strength (RCS) of coral reef limestone exhibits a decreasing trend with L/D ratio increasing. The dynamic increase factor (DIF) of UCS is linearly correlated with the logarithm of strain rate, while increasing the L/D ratio further enhances the DIF. The elastic modulus increases with strain rate or L/D ratio increasing, whereas the Poisson’s ratio approximates to a constant value of 0.24. The failure strain increases with strain rate increasing or L/D ratio decreasing, while the increase in L/D ratio will inhibit the enhancing effect of the strain rate. The high porosity and low mineral strength are the primary factors contributing to a high RCS of 16.7%–64.9% of UCS, a lower brittleness index and multiple irregular fracture planes. The failure pattern of coral reef limestone transits from the shear-dominated to the splitting-dominated failure with strain rate increasing or L/D ratio decreasing, which is mainly governed by the constrained zones induced by end friction and the strain rate-dependent crack propagation. Moreover, a predictive formula incorporating coupling effect of size and strain rate for the UCS of reef limestone was established and verified to effectively capture the trend of UCS.

珊瑚礁灰岩作为珊瑚礁油气开采和地下基础设施建设的主要岩土材料，其力学响应与陆源岩石有着明显的差异。为了研究尺寸和应变速率耦合影响下珊瑚礁灰岩的力学行为，对长径比（L/D）为0.5 ~ 2.0、应变速率为10−5·s−1 ~ 10−2·s−1的珊瑚礁灰岩试样进行了单轴压缩试验。结果表明：随着L/D比的增大，珊瑚礁灰岩的单轴抗压强度（UCS）和残余抗压强度（RCS）呈减小趋势；UCS的动态增加因子（DIF）与应变速率的对数呈线性相关，而L/D比的增加进一步提高了DIF。弹性模量随应变率或L/D比的增大而增大，泊松比接近于恒定值0.24。破坏应变随应变速率的增大或L/D比的减小而增大，而L/D比的增大会抑制应变速率的增强作用。孔隙率高、矿物强度低是导致岩石破碎强度RCS值高（16.7% ~ 64.9%）、脆性指数低、破碎面多且不规则的主要原因。珊瑚礁灰岩的破坏模式随着应变率的增大或L/D比的减小，由剪切为主向劈裂为主过渡，主要受端部摩擦形成的约束区和应变率相关的裂纹扩展控制。建立并验证了考虑尺寸和应变速率耦合效应的礁灰岩单轴蠕变预测公式，可有效捕捉单轴蠕变趋势。

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引用次数: 0

Comparative modelling of retrogressive landslide runout: 2D and 3D random large-deformation analyses using coupled Eulerian-Lagrangian method 退行性滑坡跳变的比较建模：基于耦合欧拉-拉格朗日方法的二维和三维随机大变形分析

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-11-01 DOI: 10.1016/j.ijmst.2025.10.002

Xuejian Chen , Shunping Ren , Xingsen Guo , Yueying Wang , Fei Liu , Hoang Nguyen , Rita Leal Sousa

Retrogressive landslides in sensitive clays pose significant risks to nearby infrastructure, as natural toe erosion or localized disturbances can trigger progressive block failures. While prior studies have largely relied on two-dimensional (2D) large-deformation analyses, such models overlook key three-dimensional (3D) failure mechanisms and variability effects. This study develops a 3D probabilistic framework by integrating the Coupled Eulerian–Lagrangian (CEL) method with random field theory to simulate retrogressive landslides in spatially variable clay. Using Monte Carlo simulations, we compare 2D and 3D random large-deformation models to evaluate failure modes, runout distances, sliding velocities, and influence zones. The 3D analyses captured more complex failure modes—such as lateral retrogression and asynchronous block mobilization across slope width. Additionally, the 3D analyses predict longer mean runout distances (13.76 vs. 11.92 m), wider mean influence distance (11.35 vs. 8.73 m), and higher mean sliding velocities (4.66 vs. 3.94 m/s) than their 2D counterparts. Moreover, 3D models exhibit lower coefficients of variation (e.g., 0.10 for runout distance) due to spatial averaging across slope width. Probabilistic hazard assessment shows that 2D models significantly underpredict near-field failure probabilities (e.g., 48.8% vs. 89.9% at 12 m from the slope toe). These findings highlight the limitations of 2D analyses and the importance of multi-directional spatial variability for robust geohazard assessments. The proposed 3D framework enables more realistic prediction of landslide mobility and supports the design of safer, risk-informed infrastructure.

在敏感粘土中，退行性滑坡对附近的基础设施构成重大风险，因为自然的趾部侵蚀或局部扰动可能引发渐进式块体破坏。虽然之前的研究主要依赖于二维（2D）大变形分析，但这些模型忽略了关键的三维（3D）破坏机制和变异性效应。本文将耦合欧拉-拉格朗日（CEL）方法与随机场理论相结合，建立了一个三维概率框架，用于模拟空间可变粘土中的退行性滑坡。使用蒙特卡罗模拟，我们比较了2D和3D随机大变形模型，以评估失效模式、跳动距离、滑动速度和影响区域。三维分析捕获了更复杂的破坏模式，如横向倒退和沿坡宽的异步块体移动。此外，与2D分析相比，3D分析预测的平均跳动距离更长（13.76米对11.92米），平均影响距离更宽（11.35米对8.73米），平均滑动速度更高（4.66米对3.94米/秒）。此外，由于坡宽的空间平均，3D模型表现出较低的变异系数（例如，跳动距离为0.10）。概率危害评估显示，2D模型明显低估了近场破坏概率（例如，距离坡脚12 m处48.8% vs 89.9%）。这些发现突出了二维分析的局限性，以及多向空间变异性对稳健的地质灾害评估的重要性。提出的3D框架能够更真实地预测滑坡的流动性，并支持设计更安全、风险知情的基础设施。

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引用次数: 0

Synergistic exploitation of gas hydrates through surface seawater injection coupled with depressurization: Application and optimization in the South China Sea 海面注海水联合降压协同开采天然气水合物：在南海的应用与优化

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-11-01 DOI: 10.1016/j.ijmst.2025.08.003

Yuxuan Li , Zhaobin Zhang , Rick Chalaturnyk , Shouding Li , Jianming He , Hang Bian , Xiao Li , Cheng Lu , Xuwen Qin

This study proposes and systematically evaluates an optimized integration of warm surface seawater injection with depressurization for the long-term exploitation of marine natural gas hydrates. By employing comprehensive multiphysics simulations guided by field data from hydrate production tests in the South China Sea, we pinpoint key operational parameters—such as injection rates, depths, and timings—that notably enhance production efficiency. The results indicate that a 3-phase hydrate reservoir transitions from a free-gas-dominated production stage to a hydrate-decomposition-dominated stage. Moderate warm seawater injection supplies additional heat during the hydrate decomposition phase, thereby enhancing stable production; however, excessively high injection rates can impede the depressurization process. Only injection at an appropriate depth simultaneously balances thermal supplementation and the pressure gradient, leading to higher overall productivity. A “depressurization-driven sensible-heat supply window” is introduced, highlighting that timely seawater injection following initial depressurization prolongs reservoir dissociation dynamics. In this study area, commencing seawater injection at 170 d of depressurization proved optimal. This optimized integration leverages clean and renewable thermal energy, providing essential insights into thermal supplementation strategies with significant implications for sustainable, economically feasible, and efficient commercial-scale hydrate production.

本研究提出并系统评价了面向海洋天然气水合物长期开发的暖面海水注入与降压一体化优化方案。通过在南海水合物生产测试现场数据的指导下，采用全面的多物理场模拟，我们确定了关键的操作参数，如注入速度、深度和时间，这些参数显著提高了生产效率。结果表明，三相水合物储层由游离气为主的生产阶段过渡到水合物分解为主的阶段。注入中温海水可在水合物分解阶段提供额外热量，从而提高稳定产量；然而，过高的注入速度会阻碍降压过程。只有在适当的深度注入，才能同时平衡热补充和压力梯度，从而提高整体产能。介绍了“降压驱动的显热供应窗口”，强调在初始降压后及时注入海水延长了储层分离动力学。在本研究区，在降压170 d时开始注入海水是最优的。这种优化的集成利用了清洁和可再生的热能，为热补充策略提供了重要的见解，对可持续、经济可行和高效的商业规模的水合物生产具有重要意义。

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