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Durability of MICP-reinforced calcareous sand in marine environments: Laboratory and field experimental study 海洋环境中micp增强钙质砂的耐久性:实验室和现场实验研究
Pub Date : 2023-06-01 DOI: 10.1016/j.bgtech.2023.100018
Yujie Li , Yilong Li , Zhen Guo , Qiang Xu

As eco-friendly methods, microbial induced carbonate precipitation (MICP) method was used to reinforce the calcareous sand in the South China Sea in this paper. The durability characteristics and deterioration mechanism of MICP-reinforced calcareous sand under various environment factors were investigated synthetically based on the unconfined compressive strength, mass loss rate and microscopic morphology in laboratory and field experimental study. Results show that, the unconfined compressive strength value of the sample is only 35.19 % of the initial strength, while the mass loss rate is about 6.69 % after 30-days of field marine environment erosion. MICP-reinforced calcareous sand shows the strongest resistance to temperature cycles, followed by dry-wet cycles, coupling effect of temperature and dry-wet cycle and salt spraying with drying cycles. MICP-reinforced calcareous sand exhibits the worst resistance to the field marine conditions, but the integrity of the sample could still be maintained after 30-days of field tests. The deterioration mechanism of MICP-reinforced calcareous sand is consistent under the various environmental cycles. First, the weakly cemented calcium carbonate crystals on the sample surface fall off, and then the hard-shell layer on the sample surface became weaker under various erosion. Finally, the internal cemented structure of the sample was gradually destroyed. The results indicated the utilization value of the MICP method in ocean engineering, but it is necessary to enhance the performance of the MICP-reinforced calcareous sand to ensure its protective effect after a certain environmental impact cycle.

采用微生物诱导碳酸盐沉淀法(MICP)对南海钙质砂进行了生态修复。通过室内和现场试验研究,从无侧限抗压强度、质量损失率和微观形貌等方面综合研究了MICP增强钙质砂在各种环境因素下的耐久性特征和劣化机理。结果表明,经过30天的野外海洋环境侵蚀,样品的无侧限抗压强度值仅为初始强度的35.19%,而质量损失率约为6.69%。MICP增强钙质砂对温度循环的抵抗力最强,其次是干湿循环、温度与干湿循环的耦合效应以及盐雾与干燥循环。MICP增强钙质砂对现场海洋条件的抵抗力最差,但经过30天的现场测试,样品的完整性仍然可以保持。MICP增强钙质砂在不同环境循环下的劣化机理是一致的。首先,样品表面的弱胶结碳酸钙晶体脱落,然后样品表面的硬壳层在各种侵蚀下变得较弱。最后,样品的内部胶结结构逐渐被破坏。结果表明,MICP方法在海洋工程中具有一定的应用价值,但在一定的环境影响循环后,有必要提高MICP增强钙质砂的性能,以确保其保护效果。
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引用次数: 4
Improving hydro-mechanical behavior of loess by a bio-strategy 利用生物策略改善黄土的水力学行为
Pub Date : 2023-06-01 DOI: 10.1016/j.bgtech.2023.100024
Chaosheng Tang , Xiaohua Pan , Yaojia Cheng , Xinlun Ji

Loess is widely distributed all over the world, covering about 10% of the land surface on earth. China is one of the countries with the most serious loess soil erosion in the world, especially the loess plateau. This is mainly related to the poor water stability and mechanical properties of the loess. A new coupling method of bio-cementation (Microbially Induced Calcite Precipitation: MICP) and sand additive to improve the hydro-mechanical behavior of loess was proposed. The feasibility, coupling improvement mechanism and the effects of sand content, bio-cement treatment cycle and cementation solution (CS) concentration were investigated through a series of tests. The results indicated that the proposed method was effective to improve the water stability and structure strength of loess. The coupling improvement performance were positively related to the sand content. When the sand content was 40%, compared to bio-cement treatment, the coupling treatment was 9 times deeper in treatment depth, 3.5 times stronger in peak structure strength, and the sum slaking rate was less than half. The coupling improvement mechanism can be attributed to the form of the double layers including hard crust and cemented layer. With the addition of sand, the thickness, structure strength and water stability of the double layers increased. The main reason is that there were more interfacial voids between sand particles and loess particles, increasing the permeability of loess and treatment depth, forming more amount of calcium carbonates. Based on the experimental condition in this study, 1.0 M of CS concentration was the optimal spaying strategy to improve the hydro-mechanical properties of loess.

黄土广泛分布于世界各地,约占地球表面的10%。中国是世界上黄土水土流失最严重的国家之一,尤其是黄土高原。这主要与黄土的水稳定性和力学性能较差有关。提出了一种新的生物胶结(微生物诱导煅烧沉淀:MICP)与加砂剂相结合的方法,以改善黄土的水力力学性能。通过一系列试验,研究了掺砂量、生物水泥处理周期和胶结液浓度对复合改性的可行性、耦合改性机理及效果。结果表明,该方法对提高黄土的水稳定性和结构强度是有效的。耦合改善性能与含砂量呈正相关。当含砂量为40%时,与生物水泥处理相比,耦合处理的处理深度深9倍,峰值结构强度强3.5倍,总崩解率不到一半。耦合改善机制可归因于包括硬壳和胶结层的双层形式。随着砂的加入,双层的厚度、结构强度和水稳定性都有所提高。主要原因是砂粒与黄土颗粒之间存在较多的界面空隙,增加了黄土的渗透性和处理深度,形成了较多的碳酸钙。根据本研究的实验条件,1.0 M的CS浓度是改善黄土水力学性能的最佳喷洒策略。
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引用次数: 1
Coupled experimental assessment and machine learning prediction of mechanical integrity of MICP and cement paste as underground plugging materials 地下封堵材料MICP与水泥浆力学完整性的耦合实验评价与机器学习预测
Pub Date : 2023-06-01 DOI: 10.1016/j.bgtech.2023.100020
Oladoyin Kolawole , Rayan H. Assaad , Matthew P. Adams , Mary C. Ngoma , Alexander Anya , Ghiwa Assaf

Compromised integrity of cementitious materials can lead to potential geo-hazards such as detrimental fluid flow to the wellbore (borehole), potential leakage of underground stored fluids, contamination of water aquifers, and other issues that could impact environmental sustainability during underground construction operations. The mechanical integrity of wellbore cementitious materials is critical to prevent wellbore failure and leakages, and thus, it is imperative to understand and predict the integrity of oilwell cement (OWC) and microbial-induced calcite precipitation (MICP) to maintain wellbore integrity and ensure zonal isolation at depth. Here, we investigated the mechanical integrity of two cementitious materials (MICP and OWC), and assessed their potential for plugging leakages around the wellbore. Further, we applied Machine Learning (ML) models to upscale and predict near-wellbore mechanical integrity at macro-scale by adopting two ML algorithms, Artificial Neural Network (ANN) and Random Forest (RF), using 100 datasets (containing 100 observations). Fractured portions of rock specimens were treated with MICP and OWC, respectively, and their resultant mechanical integrity (unconfined compressive strength, UCS; fracture toughness, Ks) were evaluated using experimental mechanical tests and ML models. The experimental results showed that although OWC (average UCS = 97 MPa, Ks = 4.3 MPa·√m) has higher mechanical integrity over MICP (average UCS = 86 MPa, Ks = 3.6 MPa·√m), the MICP showed an edge over OWC in sealing microfractures and micro-leakage pathways. Also, the OWC can provide a greater near-wellbore seal than MICP for casing-cement or cement-formation delamination with relatively greater mechanical integrity. The results show that the degree of correlation between the mechanical integrity obtained from lab tests and the ML predictions is high. The best ML algorithm to predict the macro-scale mechanical integrity of a MICP-cemented specimen is the RF model (R2 for UCS = 0.9738 and Ks = 0.9988; MAE for UCS = 1.04 MPa and Ks = 0.02 MPa·√m). Similarly, for OWC-cemented specimen, the best ML algorithm to predict their macro-scale mechanical integrity is the RF model (R2 for UCS = 0.9984 and Ks = 0.9996; MAE for UCS = 0.5 MPa and Ks = 0.01 MPa·√m). This study provides insights into the potential of MICP and OWC as near-wellbore cementitious materials and the applicability of ML model for evaluating and predicting the mechanical integrity of cementitious materials used in near-wellbore to achieve efficient geo-hazard mitigation and environmental protection in engineering and underground operations.

胶结材料的完整性受损可能导致潜在的地质灾害,如有害流体流到井筒(钻孔)、地下储存流体的潜在泄漏、含水层的污染,以及其他可能影响地下施工作业期间环境可持续性的问题。井筒胶结材料的机械完整性对于防止井筒失效和泄漏至关重要,因此,必须了解和预测油井水泥(OWC)和微生物诱导的方解石沉淀(MICP)的完整性,以保持井筒完整性并确保深度的分层隔离。在这里,我们研究了两种胶结材料(MICP和OWC)的机械完整性,并评估了它们堵塞井筒周围泄漏的潜力。此外,我们应用机器学习(ML)模型,通过采用人工神经网络(ANN)和随机森林(RF)两种ML算法,使用100个数据集(包含100个观测值),在宏观尺度上提升和预测近井机械完整性。分别用MICP和OWC处理岩石试样的断裂部分,并使用实验力学试验和ML模型评估其最终的机械完整性(无侧限抗压强度,UCS;断裂韧性,Ks)。实验结果表明,尽管OWC(平均UCS=97MPa,Ks=4.3MPa·√m)比MICP(平均UCS=86MPa,Ks=3.6MPa·√米)具有更高的机械完整性,但MICP在密封微裂缝和微泄漏路径方面显示出优于OWC的优势。此外,对于具有相对更大机械完整性的套管水泥或水泥地层分层,OWC可以提供比MICP更大的近井筒密封。结果表明,从实验室测试中获得的机械完整性与ML预测之间的相关性很高。预测MICP胶结试样宏观力学完整性的最佳ML算法是RF模型(UCS的R2=0.9738,Ks=0.9988;UCS的MAE=1.04 MPa,Ks=0.02 MPa·√m)。同样,对于OWC胶结试样,预测其宏观力学完整性的最佳ML算法是RF模型(UCS的R2=0.9984,Ks=0.9996;UCS的MAE=0.5 MPa,Ks=0.01 MPa·√m)。本研究深入了解了MICP和OWC作为近井胶结材料的潜力,以及ML模型在评估和预测胶结材料力学完整性方面的适用性用于近井筒,在工程和地下作业中实现有效的地质灾害缓解和环境保护。
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引用次数: 1
Enhancing biomineralization process efficiency with trained bacterial strains: A technical perspective 提高生物矿化过程效率与训练菌株:技术观点
Pub Date : 2023-06-01 DOI: 10.1016/j.bgtech.2023.100017
Chang Zhao , Vahab Toufigh , Jinxuan Zhang , Yi Liu , Wenjun Fan , Xiang He , Baofeng Cao , Yang Xiao

Microorganisms have been essential in the natural world for millions of years, contributing significantly to environmental interaction. It has been disoverd that some bacteria are potential in geotechnical and environmental engineering due to their outstanding ability of biomineralization. Therefore, how to train bacteria as special and professional “workers” for biomineralization is increasingly a key topic in related research fields. This article briefly introduces the methods that are commonly utilized to improve the environmental adaptability and mineralization efficiency of bacteria, including microbial domestication, microbial mutation breeding, microbial targeted screening, and bio-stimulation, which make great implications to advance the field of biomineralization.

数百万年来,微生物在自然界中一直是必不可少的,对环境相互作用做出了重大贡献。一些细菌由于其突出的生物矿化能力,在岩土工程和环境工程中具有潜在的应用前景。因此,如何将细菌培养成特殊的、专业的生物矿化“工人”,越来越成为相关研究领域的关键课题。本文简要介绍了提高细菌环境适应性和矿化效率的常用方法,包括微生物驯化、微生物突变育种、微生物靶向筛选和生物刺激,这些方法对推进生物矿化领域具有重要意义。
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引用次数: 2
Influence of size and concentration of carbonate biomineral on biocementation and bioclogging for mitigating soil degradation 碳酸盐生物矿物的大小和浓度对缓解土壤退化的生物胶结和生物堵塞的影响
Pub Date : 2023-06-01 DOI: 10.1016/j.bgtech.2023.100021
Surabhi Jain, Sarat Kumar Das

Microbially induced carbonate precipitation (MICP) is a promising technique to enhance the geotechnical properties of geomaterial either by strengthening via biocementation or reducing the hydraulic conductivity via bioclogging. This rate of modification mainly depends on the amount, and nature of biomineral precipitated and it is influenced by various environmental, chemical, and microbial factors. Given this, the present study aims to investigate the effect of biochemical conditions such as concentration of biomass and chemical reagents on the amount and nature of biomineral and its impact on the strength and permeability of biomodified sand. For this, the two microbes i.e., Sporosarcina pasteurii and isolated Proteus species at three different initial concentrations and chemical reagents by varying 0.1–1 molar of urea and calcium were considered. The amount and microstructural behavior of biomineral in different biochemical conditions concluded that the governing mechanism differs for both biocementation and bioclogging under identical MICP treatment. The strength enhancement or biocementation is dependent on the size of the biomineral precipitated whereas the reduction in permeability or bioclogging is mainly dominated by the amount of biomineral. The optimum value of biochemical conditions i.e., 108 cells/ml of biomass and 0.25 M concentration of cementation reagents was chosen to further evaluate the effect of equal MICP treatment on the biocementation and bioclogging of sands having different grain sizes. The study infers that not the absolute size of the biomineral but the relative size of soil grain and biomineral influence the linkage between the soil particles and hence affect the strength of biomodified soil.

微生物诱导碳酸盐沉淀(MICP)是一种很有前途的技术,可以通过生物胶结强化或通过生物测井降低导水率来提高岩土材料的岩土性能。这种改性率主要取决于沉淀的生物矿物的数量和性质,并受到各种环境、化学和微生物因素的影响。鉴于此,本研究旨在研究生物量和化学试剂浓度等生物化学条件对生物矿物数量和性质的影响及其对生物改性砂强度和渗透性的影响。为此,考虑了两种微生物,即巴氏孢子虫和分离的变形杆菌,在三种不同的初始浓度和化学试剂下,通过改变0.1–1摩尔的尿素和钙。生物矿物在不同生化条件下的数量和微观结构行为表明,在相同的MICP处理下,生物胶结和生物测井的控制机制不同。强度增强或生物胶结取决于沉淀的生物矿物的大小,而渗透率或生物测井的降低主要由生物矿物的量决定。选择生物化学条件的最佳值,即108个细胞/ml的生物质和0.25M浓度的胶结试剂,以进一步评估同等MICP处理对具有不同粒度的砂的生物胶结和生物测井的影响。该研究推断,不是生物矿物的绝对大小,而是土壤颗粒和生物矿物的相对大小影响土壤颗粒之间的联系,从而影响生物改性土壤的强度。
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引用次数: 3
Recent development on optimization of bio-cementation for soil stabilization and wind erosion control 生物胶结土稳定与风蚀防治优化研究进展
Pub Date : 2023-06-01 DOI: 10.1016/j.bgtech.2023.100022
Jia He, Yang Liu, Lingxiao Liu, Boyang Yan, Liangliang Li, Hao Meng, Lei Hang, Yongshuai Qi, Min Wu, Yufeng Gao

This paper reviews and analyzes recent research development on bio-cementation for soil stabilization and wind erosion control. Bio-cement is a type of cementitious materials by adopting natural biological processes for geotechnical and construction applications. Bio-cementation is usually achieved through microbially- or enzyme-induced carbonate precipitation (MICP or EICP). The use of soybean urease can be a cost-effective solution for carbonate precipitation and bio-cementation, which is named SICP. The produced calcium carbonate can cement soil particles and bring considerable strength improvement to soils. In this paper, the mechanisms and recent development on the technology optimization are reviewed first. The optimization of bio-cementation involves 1) altering the treatment materials and procedures such as using lysed cells, low pH, the salting-out technique; and 2) using cheap and waste materials for bio-cement treatment and bacterial cultivation. The objectives are to improve treatment uniformity and efficiency, use bio-cement in more scenarios such as fine-grain soils, and reduce costs and environmental impacts, etc. Studies on the mechanical behaviour and wind erosion performances of bio-cemented soil show that the wind erosion resistance can be improved significantly through the bio-cement treatment. In addition, the use of optimized method and additives such as xanthan gum and fibers can further enhance the strength, treatment uniformity or ductility of the bio-cemented soils. Attention should be paid to wind forces with saltating particles which have much stronger destructive effect than pure wind, which should be considered in laboratory tests. Field studies indicate that bio-cement can improve soil surface strength and wind erosion resistances effectively. Besides, local plants can germinate and grow on bio-cemented soil ground with low-concentration treatments.

本文综述和分析了近年来生物胶结技术在土壤稳定和风蚀治理方面的研究进展。生物水泥是一种采用天然生物工艺在岩土工程和建筑工程中应用的胶凝材料。生物胶结通常通过微生物或酶诱导的碳酸盐沉淀(MICP或EICP)实现。大豆脲酶是一种经济高效的碳酸盐沉淀和生物胶结解决方案,被称为SICP。生产的碳酸钙可以水泥化土壤颗粒,并显著提高土壤强度。本文首先对技术优化的机理和最新进展进行了综述。生物胶结的优化包括1)改变处理材料和程序,如使用裂解细胞、低pH、盐析技术;和2)使用廉价和废弃的材料进行生物水泥处理和细菌培养。其目的是提高处理的均匀性和效率,在细粒土等更多场景中使用生物水泥,降低成本和环境影响等。对生物水泥土的力学性能和风蚀性能的研究表明,通过生物水泥处理可以显著提高其抗风蚀性。此外,使用优化的方法和添加剂,如黄原胶和纤维,可以进一步提高生物水泥土的强度、处理均匀性或延展性。应注意带有跳跃颗粒的风力,这种风力的破坏力比纯风强得多,应在实验室测试中予以考虑。现场研究表明,生物水泥能有效提高土壤表面强度和抗风蚀能力。此外,当地植物可以在低浓度处理的生物水泥地面上发芽和生长。
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引用次数: 2
A critical review of biomineralization in environmental geotechnics: Applications, trends, and perspectives 环境岩土工程中生物矿化的评述:应用、趋势和前景
Pub Date : 2023-03-01 DOI: 10.1016/j.bgtech.2023.100003
Yu Zhang , Xinlei Hu , Yijie Wang , Ningjun Jiang

In this review paper, the applications of biomineralization in environmental geotechnics are analyzed. Three environmental geotechnics scenarios, namely heavy metal contamination immobilization and removal, waste and CO2 containment, and recycled use of industrial byproducts, are discussed and evaluated regarding current trends and prospects. The biomineralization process, specifically the Microbially Induced Carbonate Precipitation (MICP) technology, is an effective solution for immobilizing heavy metals through co-precipitation with calcium carbonate, with successful results in cleaning up contaminated soils. The nature of biomineralization enhances earth material strength and decreases permeability, making it suitable for waste and CO2 containment. Additionally, using industrial byproducts in MICP technology can improve the physical, mechanical, and hydraulic properties of earth materials, making it a potential solution for efficient waste utilization. In conclusion, the applications of biomineralization in environmental geotechnics hold great promise for solving various environmental problems. However, further research is needed to better understand the control and consistency of biomineralization processes, the durability of biominerals, the scale of applications, and environmental concerns.

本文分析了生物矿化在环境岩土工程中的应用。讨论并评估了三种环境岩土工程方案,即重金属污染的固定和去除、废物和二氧化碳的控制以及工业副产品的回收利用,以了解当前的趋势和前景。生物矿化过程,特别是微生物诱导碳酸盐沉淀(MICP)技术,是通过与碳酸钙共沉淀固定重金属的有效解决方案,在清理污染土壤方面取得了成功。生物矿化的性质提高了土壤材料的强度并降低了渗透性,使其适合于废物和二氧化碳的控制。此外,在MICP技术中使用工业副产品可以改善土壤材料的物理、机械和水力性能,使其成为高效废物利用的潜在解决方案。总之,生物矿化在环境岩土工程中的应用对解决各种环境问题具有很大的前景。然而,还需要进一步的研究来更好地了解生物矿化过程的控制和一致性、生物矿物的耐久性、应用规模和环境问题。
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引用次数: 15
Inorganic ionic polymerization: A bioinspired strategy for material preparation 无机离子聚合:一种生物启发的材料制备策略
Pub Date : 2023-03-01 DOI: 10.1016/j.bgtech.2023.100004
Jian Zhang, Weifeng Fang, Zhaoming Liu, Ruikang Tang

Bioinspired materials with excellent properties have attracted intense interests of scientists, and the methodology for rationally design of these materials is crucially important. This review briefly introduces our recent achievements on inorganic ionic polymerization for bioinspired material preparation. The inorganic ionic polymerization realized the assembly of inorganic ions in a way similar to the polymerization in polymer chemistry, overcoming the limitation by classical nucleation pathway. It enabled the moldable construction of inorganic minerals and even the reconstruction of enamel tissue, which commonly only achieved by biomineralization. In the presence of organic molecules, the inorganic ionic polymerization could participate in the organic polymerization, resulting in hybrids with molecular-scaled organic-inorganic homogeneity. And furthermore, under the regulation of bio-inspired molecules, the condensed state of the assembled inorganic ions could show unusual behaviors: such as adding the flexibility to commonly fractal inorganic minerals, and flowability to solid mineral particles. It enabled the production of flexible mineral materials as plastic substitute, and the extrusion forming of moldable minerals under room temperature. The inorganic ionic polymerization demonstrated a promising way to synthesize inorganics in a more rational way, which may shed light on more advanced bio-inspired and biomimetic material.

具有优异性能的仿生材料引起了科学家的极大兴趣,合理设计这些材料的方法至关重要。本文简要介绍了近年来无机离子聚合制备仿生材料的研究进展。无机离子聚合以类似于聚合物化学中聚合的方式实现了无机离子的组装,克服了经典成核途径的限制。它能够塑造无机矿物,甚至重建牙釉质组织,而这通常只能通过生物矿化来实现。在有机分子存在的情况下,无机离子聚合可以参与有机聚合,产生具有分子尺度有机-无机均匀性的杂化物。此外,在仿生分子的调控下,组装的无机离子的凝聚态可能表现出不同寻常的行为:例如为常见的分形无机矿物增加了灵活性,为固体矿物颗粒增加了流动性。它能够生产作为塑料替代品的柔性矿物材料,并在室温下挤出成型可成型矿物。无机离子聚合为以更合理的方式合成无机物提供了一种很有前途的方法,这可能为更先进的仿生生物材料提供线索。
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引用次数: 1
Challenges of rock drilling and opportunities from bio-boring 岩石钻探的挑战和生物钻孔带来的机遇
Pub Date : 2023-03-01 DOI: 10.1016/j.bgtech.2023.100009
Yumeng Zhao, Sheng Dai

Drilling plays a significant role in the history of human civilization. The exploration of greater depths, extreme environments, or hazardous areas calls for more energy-efficient and high levels of autonomous drilling technologies with reduced cost and improved safety. Meanwhile, nature presents numerous biological boring examples that can be a source of inspiration to renovate our current drilling technologies. This paper reviews both man-made and biological drilling strategies and quantifies their performance by the dimensionless specific drilling energy and the rate of penetration. The results highlight that rotary drilling (including tunnel boring machines) remains the most popular method for subsurface drilling due to its advanced technical status and fewer environmental concerns. For harder rocks, the specific energy of rotary drilling increases dramatically, while percussion drilling requires nearly the same if not lower specific energy but with compromised bit durability that can significantly slow down the drilling operation. Innovative drilling technologies developed and tested in the laboratory still demand improved energy efficiency and penetration rate to be competitive. Bio-boring by natural organisms mostly outperforms man-made drilling technologies in terms of energy efficiency, penetration rate, or both. Studying the underlying mechanisms of bio-boring and translating such knowledge into developing innovative drilling technologies are of significance to subsurface construction and exploration.

钻井在人类文明史上发挥着重要作用。对更大深度、极端环境或危险区域的勘探需要更节能、更高水平的自主钻井技术,以降低成本和提高安全性。与此同时,大自然提供了许多生物无聊的例子,这些例子可以成为我们更新当前钻井技术的灵感来源。本文综述了人工和生物钻井策略,并通过无量纲比钻井能量和渗透率来量化它们的性能。研究结果表明,旋转钻井(包括隧道钻机)由于其先进的技术地位和较少的环境问题,仍然是最受欢迎的地下钻井方法。对于较硬的岩石,旋转钻井的比能显著增加,而冲击钻井需要几乎相同的比能(如果不是更低的话),但钻头耐久性受损,这会显著减慢钻井操作。实验室开发和测试的创新钻井技术仍然需要提高能源效率和渗透率才能具有竞争力。天然生物钻孔在能源效率、渗透率或两者方面大多优于人工钻孔技术。研究生物钻孔的潜在机制,并将这些知识转化为开发创新的钻井技术,对地下施工和勘探具有重要意义。
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引用次数: 4
Applications of microbial-induced carbonate precipitation: A state-of-the-art review 微生物诱导碳酸盐沉淀的应用:最新进展
Pub Date : 2023-03-01 DOI: 10.1016/j.bgtech.2023.100008
Yuze Wang , Charalampos Konstantinou , Sikai Tang , Hongyu Chen

Microbial-Induced Carbonate Precipitation (MICP) is a naturally occurring process whereby bacteria produce enzymes that accelerate the precipitation of calcium carbonate. This process is facilitated through various bacterial activities, including ureolysis, sulfate reduction, iron reduction, and denitrification. The application of MICP has been widespread in a range of engineering fields, such as geotechnical, concrete, environmental, and oil and gas engineering for soil stabilization, concrete remediation, heavy metal solidification, and permeability control. Numerous review papers have been published that summarize the mechanisms and properties associated with different MICP applications. The purpose of this review paper is to provide a comprehensive summary of the various engineering applications of MICP, along with the mechanisms, materials, and engineering properties associated with each application. By comparing the similarities and differences in MICP research progress across different engineering fields, this review aims to increase understanding of MICP, stimulate new research ideas, and accelerate the development of MICP techniques.

微生物诱导碳酸盐沉淀(MICP)是一种自然发生的过程,细菌通过该过程产生加速碳酸钙沉淀的酶。这一过程是通过各种细菌活动促进的,包括尿素解、硫酸盐还原、铁还原和反硝化。MICP的应用已广泛应用于一系列工程领域,如用于土壤稳定、混凝土修复、重金属固化和渗透性控制的岩土、混凝土、环境和石油天然气工程。已经发表了许多综述论文,总结了与不同MICP应用相关的机制和特性。本文的目的是全面总结MICP的各种工程应用,以及与每种应用相关的机制、材料和工程特性。通过比较不同工程领域MICP研究进展的异同,本综述旨在增加对MICP的理解,激发新的研究思路,加快MICP技术的发展。
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引用次数: 15
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Biogeotechnics
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