Engineering Geology最新文献_第7页

A novel hybrid hydraulic fracturing phase-field model for porous media

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2025-01-21 DOI: 10.1016/j.enggeo.2025.107932

Feng Zhu , Hongxiang Tang , Degao Zou , Xue Zhang , Yonghui Li

This study proposes a novel 2D hybrid hydraulic fracturing phase-field model for simulating the complex fracturing processes in porous media. By coupling Reynolds flow with the cubic law in fractures and Darcy's flow in the low-permeability surrounding reservoir, the fracture-reservoir fluid governing equations are established. To simulate hydraulic fractures, an energy functional for fluid-driven fracture propagation in porous media was developed within a hybrid framework. The proposed functional is based on the interactions between the fluid, fractures, and the surrounding matrix, addressing key issues, such as nonphysical fractures under compression and fracture healing, while maintaining displacement field linearity. Additionally, the proposed functional considers not only the effect of pore water outside the fractures but also the work done by the injection fluid on the internal fracture walls. The fracture width, stress degradation function, fluid leak-off, and strain energy are critical links in hydromechanical–fracture coupling. The above coupled model was discretized using isogeometric analysis and iteratively solved with a staggered scheme. Six 2D examples were used to evaluate the model's validity, computational capability, and hydraulic fracturing behaviour. The results showed that the proposed model can reasonably capture the highly nonlinear hydraulic fracturing process in shale reservoirs, including matrix deformation, fracture propagation, injection fluid flow inside fractures, pore water seepage outside fractures, and fluid leak-off.

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引用次数: 0

Evolutionary characteristics and correlations between deformation energy and strain in anthracite coal during stress wave-induced catastrophes

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2025-01-21 DOI: 10.1016/j.enggeo.2025.107931

Li Zhang , Tingjiang Tan , Enyuan Wang , Yubing Liu , Dong Chen

Understanding the deformation evolution process, as well as the energy storage and transformation behavior of coal under the influence of stress waves, is essential to promote technological progress and safety improvement in mining, underground engineering, and energy utilization. With the SHPB system, dynamic impact tests were conducted on anthracite coal under varying impact loads in this study. The deformation parameter characteristics of anthracite coal were examined regarding the storage and transformation patterns of deformation energy. Further analysis was performed on the attenuation laws of stress waves in the time and frequency domains. Besides, the correlation characteristics of strain and deformation energy in the stress wave disaster-causing mechanism were investigated, revealing that maximum and residual strain exhibited a notable linear relationship with impact load, with growth rates of 0.209 % and 0.212 %, respectively. Parameters ε_b and ε_h followed a down-concave exponential growth pattern and an up-concave exponential decrease pattern, respectively. W_d and W_s presented a notable linear strain rate effect, with growth rates of 2.44 and 2.30, respectively, and a significant linear energy effect, with growth rates of 0.46 and 0.44, respectively. W_b and W_h demonstrated a down-concave exponential growth pattern and an up-concave exponential decrease. The reflection and transmission effects of the stress wave in the time domain displayed clear linear growth and attenuation trends with the impact load, characterized by a growth rate of 0.020 and an attenuation rate of 0.015, respectively. Furthermore, an approximate linear increase appeared on the spectrum amplitudes of the incident, reflection, and transmission waves, with growth rates of 0.035, 0.032, and 0.0074, respectively.

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引用次数: 0

Liquefaction hazard mapping in DMDP area of Bangladesh: A comprehensive assessment using SCPT data and multiple severity indices

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2025-01-21 DOI: 10.1016/j.enggeo.2025.107928

Md. Hossain Safayet, Ashna Tasnim, Mehedi A. Ansary

Only a small number of studies in the past have used a substantial amount of data to assess the liquefaction risk in Dhaka, the capital of Bangladesh. Dhaka falls within a moderate seismic zone. Due to the extensive number of development projects in this area, it has become crucial to identify high-risk regions with good precision. This study is an attempt to develop a liquefaction potential map for the Dhaka Metropolitan Development Plan (DMDP), having an area of 1530 sq. km based on an ample number of SCPT data using BI-14 triggering methodology and three severity indices (LPI, LPI_ISH, LSN). Micro-zoned PGA value of a 475-year return period, combining soil type and deposit, has been used to analyze a 400 SCPT dataset by Horizon software, recently developed by Geyin and Maurer. This study has produced four maps based on the LPI, LPI_ISH, LSN indices and a combination of LPI and LPI_ISH to evaluate the seismic risk intensity across the DMDP area. Depending on cumulative frequency curves, a zonation-based analysis has been developed using two dominant soil deposits to enhance the applicability of the result. For Zone 1 (Floodplain Deposit), 79 %, 68 %, 63 % and 77 % of the area have been marked as susceptible to liquefaction by LPI, LPI_ISH, LSN and combined index respectively. In Zone 2 (Madhupur Clay Deposit), assessments indicated that 65 %, 36 %, 38 % and 55 % of the area are prone to liquefaction susceptibility. This study has anticipated to provide policymakers with valuable insights regarding urban planning, development, expansion, implementation of safety measures, and production of risk management plans.

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引用次数: 0

Experimental investigation on swelling and gas breakthrough properties of GMZ bentonite considering alkaline solution effects

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2025-01-21 DOI: 10.1016/j.enggeo.2025.107933

Lin-Yong Cui , Wei-Min Ye , Qiong Wang , Yong-Gui Chen , Bao Chen , Yu-Jun Cui

The degradation of concrete elements during the construction and operation of a repository can produce hyperalkaline groundwater, which may compromise the mechanical integrity and gas tightness of the engineering barrier system. Most of the previous studies focused on influences of the alkaline solutions on swelling and permeability characteristics of bentonite, but failed to address the gas migration behaviors in the bentonite specimen. In this study, a series of NaOH solutions (0.01, 0.1, 0.5 and 1 M) injection and subsequent gas injection/breakthrough experiments were carried out on the compacted bentonite specimens with 1.7 g/cm³ dry density. During the test, swelling pressure, saturated permeability, gas breakthrough pressure and effective gas permeability were recorded. After the gas injection test, the bentonite specimen was submitted for the mercury intrusion porosimeter (MIP) and scanning electron microscopy (SEM) tests to analyze microstructural and morphological changes of the specimen. Results show that, during the solution infiltration test, the axial pressure became gradually stabilized when a constant or steady-state flow condition was reached. With the increase of NaOH solution concentrations, the swelling pressure decreased while the saturated permeability increased. Before occurrence of the gas breakthrough, the effective gas permeabilities are in an order of magnitude varying between 10⁻²⁴ and 10⁻²² m², and show an increasing trend as NaOH solution concentrations increased. Montmorillonite minerals dissolution leads to a decrease of the strongly adsorbed water on the surface of clay minerals and a decrease of the swelling pressure. Consequently, gas can easily move in the bentonite specimen by capillary displacement or formation of the dilatant pathways at a lower injection pressure, eventually threatening the long-term safety and performance efficiency of a deep geological repository.

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引用次数: 0

Analysis on the failure mechanism and entire evolution process of toppling bank slope under heavy rainfall utilizing material point method

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2025-01-21 DOI: 10.1016/j.enggeo.2025.107935

Chao Su , Ailan Che , Jifang Zhou , Guoquan Xie

The Yalong River hydropower base is located on the eastern margin of Tibet Plateau, where the toppling slopes are widely distributed. The toppling slopes are susceptible to sliding during rainfall, posing a significant safety risk to hydroelectric generating. Examining the kinematic properties and disaster effects of potential landslides is crucial for assessing risks and the safety management of reservoirs, as well as understanding the failure mechanism of toppling slopes. Tiangeng slope is a toppling bank slope situated in the middle reaches of Yalong River, and its deformation mode is representative of the region. To facilitate disaster mitigation and early warning in reservoir area, the Tiangeng slope is analyzed by the integration of field monitoring and material points method (MPM). Additionally, the MPM results are compared with the finite element method (FEM), thereby confirming the reliability of MPM. The essential information such as slope deformation trend and potential sliding surface are obtained by field monitoring, which provides a basis for establishing the numerical model. The MPM is an efficient numerical technique for examining geotechnical nonlinear large deformation issues. The MPM is utilized to investigate the entire evolution process of slope failure under rainfall, emphasizing the post-landslide stage. The results show that the slope exhibits typical toppling-slip deformation, with the principal failure characteristic being creep-tension cracking. The potential slope failure exhibits retrogression and traction characteristics, comprising four distinct stages and a maximum runout distance of 202.9 m.

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引用次数: 0

Submarine gravity flows and their interaction with offshore pipelines: A review of recent advances

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2025-01-21 DOI: 10.1016/j.enggeo.2025.107914

Zhiguo He , Samuel Ukpong Okon , Peng Hu , Haoyang Zhang , Ita Ewa-Oboho , Qian Li

The increase in offshore exploration for oil and natural gas has raised concerns about the safety of pipelines in the face of submarine slides, debris flow, and high-density turbidity currents. These submarine gravity flows constitute significant marine geohazards as they undermine the structural integrity of offshore pipelines, underscoring the importance of understanding the complexities of the dynamic interaction process. We herein present a comprehensive review of the complex interactions between submarine gravity flows and offshore pipelines. Emphasis is on the influence of pipeline characteristics, environmental factors, and flow properties on the impact force exerted on the offshore pipeline and the overall interaction process. Recent literature indicates that implementing modified pipeline designs, such as streamlined shapes and advanced design materials, can effectively minimize drag and lift forces, thus potentially reducing the risk of damage by submarine gravity flows. This underscores the need to combine sophisticated engineering designs and durable materials to protect offshore pipelines. This paper provides an in-depth understanding of the interaction between submarine gravity flows and pipeline infrastructures, suggesting the implementation of real-time monitoring technologies, novel pipeline materials, and the adoption of innovative designs that can withstand adverse seafloor environments and effectively mitigate the risk of sediment-induced damage in landslide-prone regions. The article summarizes existing knowledge on mitigative technologies and recommends areas for further investigation to improve the safety and durability of submarine pipelines.

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引用次数: 0

Enhancing long-term prediction of non-homogeneous landslides incorporating spatiotemporal graph convolutional networks and InSAR

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2025-01-18 DOI: 10.1016/j.enggeo.2025.107917

Zongzheng Li, Jianping Chen, Chen Cao, Wen Zhang, Kuanxing Zhu, Ji Bai, Chenyang Wu

Accurately predicting landslides is critical for effective warning and management, but remains challenging due to unpredictable triggering events and the spatial heterogeneity of soil and slope structures. Existing prediction methods often rely on point-sampled data, neglecting the heterogeneity in landslide evolution. To address this, we propose integrating Spatiotemporal Graph Convolutional Networks (STGCN) with Synthetic Aperture Radar Interferometry (InSAR) to capture the spatiotemporal characteristics of landslide events. The STGCN processes spatial features through its Graph Neural Network (GNN) layer and analyzes temporal dynamics using the Gated Recurrent Unit (GRU) layer. This allows for a more precise extraction of displacement features associated with landslides. An application of this approach in the Sela Mountain region of the Jinsha River on the Tibetan Plateau (China) demonstrated that the STGCN model significantly improves prediction accuracy compared to traditional deep learning models, with Mean Squared Error (MSE) and Mean Absolute Error (MAE) reduced to 25.51 and 2.34, respectively. This represents a 35 % and 50 % improvement over the best-performing traditional model in similar tests. Notably, this method, notably the first to incorporate the direction of material migration in landslide predictions, effectively addresses the challenge of spatial heterogeneity and expands the predictive framework from merely temporal to both spatial and temporal dimensions. Our findings highlight that this integrated approach provides a powerful tool for more accurate and comprehensive landslide prediction.

{"title":"Enhancing long-term prediction of non-homogeneous landslides incorporating spatiotemporal graph convolutional networks and InSAR","authors":"Zongzheng Li, Jianping Chen, Chen Cao, Wen Zhang, Kuanxing Zhu, Ji Bai, Chenyang Wu","doi":"10.1016/j.enggeo.2025.107917","DOIUrl":"10.1016/j.enggeo.2025.107917","url":null,"abstract":"<div><div>Accurately predicting landslides is critical for effective warning and management, but remains challenging due to unpredictable triggering events and the spatial heterogeneity of soil and slope structures. Existing prediction methods often rely on point-sampled data, neglecting the heterogeneity in landslide evolution. To address this, we propose integrating Spatiotemporal Graph Convolutional Networks (STGCN) with Synthetic Aperture Radar Interferometry (InSAR) to capture the spatiotemporal characteristics of landslide events. The STGCN processes spatial features through its Graph Neural Network (GNN) layer and analyzes temporal dynamics using the Gated Recurrent Unit (GRU) layer. This allows for a more precise extraction of displacement features associated with landslides. An application of this approach in the Sela Mountain region of the Jinsha River on the Tibetan Plateau (China) demonstrated that the STGCN model significantly improves prediction accuracy compared to traditional deep learning models, with Mean Squared Error (MSE) and Mean Absolute Error (MAE) reduced to 25.51 and 2.34, respectively. This represents a 35 % and 50 % improvement over the best-performing traditional model in similar tests. Notably, this method, notably the first to incorporate the direction of material migration in landslide predictions, effectively addresses the challenge of spatial heterogeneity and expands the predictive framework from merely temporal to both spatial and temporal dimensions. Our findings highlight that this integrated approach provides a powerful tool for more accurate and comprehensive landslide prediction.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"347 ","pages":"Article 107917"},"PeriodicalIF":6.9,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temperature anomaly as an indicator of groundwater flow prior to the shaft sinking with the use of artificial ground freezing

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2025-01-18 DOI: 10.1016/j.enggeo.2025.107916

Zenon Pilecki , Krzysztof Krawiec , Elżbieta Pilecka , Stanisław Nagy , Tomasz Łątka

The study aimed to evaluate hydrogeological conditions for shaft sinking using artificial ground freezing in complex geological formations of the Upper Silesian Coal Basin (USCB) in Poland. Temperature logging was conducted to a depth of 460 m in five boreholes positioned around the freezing cylinder and four boreholes along the radius extending beyond the freezing cylinder. An effective borehole temperature acquisition system was created using autonomous sensors. A novel approach was developed for the quantitative assessment of temperature anomalies, enhancing data processing and interpretation. Two types of temperature anomalies–negative and positive–have been defined related to groundwater convection. The locations of temperature anomalies strongly correlate with the hydrogeological and lithological data obtained at the stage of preliminary geological recognition. Negative anomalies indicated increased temperature in aquifers, including fractured and tectonically disturbed zones. Positive anomalies indicated decreased temperature in zones of poorly permeable rocks. The study revealed that temperature anomalies not influenced by the geothermal gradient are almost half the size of those influenced by the geothermal gradient. The findings provide more effective insights into the applications of borehole temperature measurements to better monitor the freezing process. In the stage of shaft sinking, the research contributed to modifying the freezing technology and strengthening the shaft lining.

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引用次数: 0

Research and monitoring on the water-heat-gas behavior and frost heaving characteristics of coarse-grained fillers under unidirectional freezing conditions

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2025-01-16 DOI: 10.1016/j.enggeo.2025.107915

Haihua Zhang , Haojin Zhang , Zhenghao Liu , Xianfeng Ma , Jiangu Qian

Gaseous water migration is a crucial factor in the development of frost heaving in coarse-grained fillers. The goal is to study the gaseous water migration and frost heaving characteristics of coarse-grained fillers. Based on the law of light reflection and refraction, Polymer optical fiber (POF) sensors are proposed to monitor the light intensity in the fillers during the freezing process, so that the intrinsic correlation between the light intensity and the phase transition and migration of water can be analyzed. A series of unidirectional experiments was conducted by using a gaseous water migration system alongside POF sensors. The experimental results show that particle size and initial water content profoundly influence the freezing depth and the volume of gaseous water migration. Larger particle sizes and lower initial water contents enhance gaseous water migration. Fine-grained induced early deformation, and the soil skeleton caused continuous frost heaving, with both mutually constraining each other. By harnessing the data from POF sensor monitoring to forge a light intensity-inflow relationship model, it is found that the study could grasp the phase change and gaseous water migration in real-time. The results of gaseous water migration in coarse-grained fillers provided a valuable supplement to traditional frost heaving theory.

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引用次数: 0

Experimental analysis on breaching mechanism of earth-rock dam induced by landslide generated waves 滑坡产生的波浪诱发土石坝溃坝机理的实验分析

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2025-01-12 DOI: 10.1016/j.enggeo.2025.107913

Zhen-han Du , Jia-Wen Zhou , Shi-Chen Zhang , Qi-Ming Zhong , Hai-Bo Li , Yu-Xiang Hu , Cong-Jiang Li , Jie-Yuan Zhang

High earth-rock dams and large reservoirs have been widely constructed in mountainous river valleys. These areas contain a significant number of potential landslide areas, which can be triggered by external factors, such as earthquakes, heavy rainfall, or water level fluctuations. The impact of landslide-generated waves can lead to the breaching and failure of earth-rock dams. To investigate the breaching mechanisms of earth-rock dams and the erosion patterns caused by landslide-generated waves, a series of integrated physical experiments was conducted to simulate the process of wave-dam breach scenarios. The wave climbing process in front of a dam and the erosion characteristics of different types of waves were analysed. Critical criteria for wave-induced dam erosion and breaches were also proposed. The breaching process was examined under the influence of various factors. The results indicate that the dam breach can be divided into three stages under the impact of landslide-generated waves: surge run-up overtopping stage, surge impact erosion stage, and conventional overtopping erosion stage. When a wave climbing height in front of the dam is higher than the dam height (R_i^⁎ > (h_d)_i-1), the dam crest is continuously eroded; when the average water level in front of the dam is greater than the height of the dam after erosion (h_i > (h_d)_i), the earth-rock dam breaks. The erosion of the dam body induced by waves was more severe under identical hydraulic conditions than dam breaches under natural overtopping. This results in faster breach development, earlier breach initiation, higher peak discharge, longer breach duration, and greater overall risk.

高土石坝和大型水库在山区河谷中广泛建设。这些地区包含大量潜在的滑坡区，可能由地震、强降雨或水位波动等外部因素引发。滑坡波的冲击可导致土石坝的溃坝和破坏。为研究土石坝溃决机制和滑坡波侵蚀模式，进行了一系列综合物理实验，模拟了滑坡波坝溃决情景的过程。分析了坝前波浪爬升过程和不同类型波浪的侵蚀特性。还提出了波浪引起的大坝侵蚀和决口的关键准则。考察了各种因素影响下的破壁过程。结果表明：溃坝溃坝在滑坡波作用下可分为3个阶段：涌升冲顶阶段、涌冲冲蚀阶段和常规冲顶侵蚀阶段；当坝前爬波高度高于坝高时(Ri >；（hd）i-1)，坝顶持续受到侵蚀；当坝前平均水位大于冲刷后坝高时(hi >；（hd）i)，土石坝决堤。相同水力条件下，波浪对坝体的侵蚀比自然漫顶条件下的溃坝更为严重。这导致了更快的破坏发展，更早的破坏开始，更高的峰值流量，更长的破坏持续时间，更大的整体风险。

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引用次数: 0