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A laboratory acoustic emission experiment and numerical simulation of rock fracture driven by a high-pressure fluid source

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第1期8卷 27-34页

作者： Xinglin Lei takahiro funatsu Shengli Ma Liqiang Liu Geological Survey of Japan National Institute of Advanced Industrial Science and Technology State Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Western Australian School of Mines Curtin University

In order to improve our understanding of rock fracture and fault instability driven by high-pressure fluid sources, the authors carried out rock fracture tests using granite under a confining pressure of 80 MPa with fluid injection in the laboratory. Furthermore, we tested a number of numerical models using the FLAC;modeling software to find the best model to represent the experimental results. The high-speed multichannel acoustic emission（AE） waveform recording system used in this study made it possible to examine the total fracture process through detailed monitoring of AE hypocenters and seismic *** experimental results show that injecting high-pressure oil into the rock sample can induce AE activity at very low stress levels and can dramatically reduce the strength of the rock. The results of the numerical simulations show that major experimental results, including the strength, the temporal and spatial patterns of the AE events, and the role of the fluid can be represented fairly well by a model involving（1） randomly distributed defect elements to model pre-existing cracks,（2） random modification of rock properties to represent inhomogeneity introduced by different mineral grains, and（3）macroscopic inhomogeneity. Our study, which incorporates laboratory experiments and numerical simulations, indicates that such an approach is helpful in finding a better model not only for simulating experimental results but also for upscaling purposes.

关键词： Laboratory experiment Acoustic emission(AE) Fracture Numerical simulation Fluid injection

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Analysis of the Factors for Displacement of Earth Retaining Wall with Twin-Stepped Construction

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World Journal of Engineering and Technology 2019年第1期7卷 114-121页

作者： Seiya Sakuma Kazuki Maehara takahiro funatsu Akihiro Hamanaka Takashi Sasaoka Hideki Shimada Department of Earth Resources Engineering Faculty of Engineering Kyushu University Fukuoka Japan

The demand for specific earth retaining wall method is increasing, along with the advancement and overcrowding of underground space use, such as the?presence of close structures, in an urban area. The method is named stepped-twin?retaining wall. The feature of this method is to have inner and outer retaining walls and excavate the ground by two-step in order to minimize the effect of the excavation on neighboring existing structures. However, the design of the earth retaining wall is currently carried out by individual engineers based on their own experience. Therefore, it is crucial that the standard method of retaining wall using a two-step construction is established. As the first step toward the standardization, evaluation of factors affecting the ground behavior of the earth retaining wall was carried out. In particular, we picked up four major considerable factors, which are horizontal distance between the outer and inner walls, depth of outer wall embedment, mechanical properties of soil. The evaluation was done by using two dimensional FEM analysis and the results were summarized to make clear the effect of each factor.

关键词： Excavation Behavior Earth Retaining Wall Finite Element Method

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与日本中部以北松代震群(1965-1967年)相关的地壳中部流体：地球化学反演

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世界地震译丛 2017年第1期48卷 13-31页

作者： Yasuko Okuyama takahiro funatsu Takashi Fujii Naohiko Takamoto Toshiyuki Tosha 仵柯田(译) 孙凤霞(校) 杜建国(校) 朱玉萍(复校) 不详中国地质大学(北京)地球科学与资源学院中国地震局地震预测研究中国地震局地球物理研究所

日本中部长野县北部的松代地区,1965~1967年经历了一场与地面隆起、地下水上涌有关的严重震群。对该震群区域的地表水和地下水地球化学以及同位素地球化学做了调查研究,从盐泉、淡水、浅井和沿松代断层带7口深井(井深最大可达600m)采集... 详细信息

日本中部长野县北部的松代地区,1965~1967年经历了一场与地面隆起、地下水上涌有关的严重震群。对该震群区域的地表水和地下水地球化学以及同位素地球化学做了调查研究,从盐泉、淡水、浅井和沿松代断层带7口深井(井深最大可达600m)采集了水样。该断层带深井水样分析结果表明,水中溶解的Na,K,Al,Cl,Br,B及SiO_4含量与δD,δ^(18) O,δ^(13)C值呈线性增长。氢、氧同位素比率表明井水是地表水和富同位素重水(如"安山岩型水",Giggenbach,1992)的混合物。假定同位素重水中的δD与"安山岩型水"相似,根据井水的分析数据可以恢复深部卤水的地球化学特征。恢复的深部卤水组分富含Na,Ca,Cl以及HCO_3,并且总溶解固体量与海水相近。估计恢复组分的水位于断层带深处(深度>3km)。现有数据显示松代断层带地球化学体系自该震群结束后从未改变,恢复的水组分与触发震群的卤水相似。恢复水的盐度没有来源于海洋板块俯冲脱水的深部卤水的高,深部卤水的Cl含量是海水的两倍。相对于海水,低盐度比是火山区域中部地壳流体的特性之一。

关键词：震群松代地下水地壳流体稳定同位素

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