水力耦合作用下玄武岩启裂机制与临界水压研究

doi:10.16285/j.rsm.2022.0672

岩土力学 ›› 2023, Vol. 44 ›› Issue (S1): 83-90.doi: 10.16285/j.rsm.2022.0672

水力耦合作用下玄武岩启裂机制与临界水压研究

朱泽奇^{1, 2}，田铠玮¹，徐启钟³，崔岚^{1, 2}，盛谦^{1, 2}

1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，湖北武汉 430071； 2. 水下隧道技术国家地方联合工程研究中心，湖北武汉 430071；3. 沈阳工业大学建筑与土木工程学院，辽宁沈阳 110870

收稿日期:2022-05-07 接受日期:2022-06-30 出版日期:2023-11-16 发布日期:2023-11-16
作者简介:朱泽奇，男，1980年生，博士，副研究员，主要从事岩石力学与试验方面的研究。
基金资助:
国家自然科学基金联合基金重点项目（No. U21A20159）

Research on crack initiation mechanism and critical water pressure of basalt under hydraulic coupling

ZHU Ze-qi^{1, 2}, TIAN Kai-wei¹, XU Qi-zhong³, CUI Lan^{1, 2}, SHENG Qian^{1, 2}

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. National and Local Joint Engineering Research Center for Underwater Tunnel Technology, Wuhan, Hubei 430071, China; 3. College of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, Liaoning 110870, China

Received:2022-05-07 Accepted:2022-06-30 Online:2023-11-16 Published:2023-11-16
Supported by:
This work was supported by the Key Program of Joint Funds of National Natural Science Foundation of China (U21A20159).

摘要/Abstract

摘要： 为了研究岩石在水力耦合作用下的启裂机制，针对溪洛渡玄武岩开展了水力耦合三轴试验与声发射测试。试验结果表明：玄武岩峰值强度随着围压的增大而增大，表现出典型的硬脆性行为；当围压保持不变时，其峰值强度随初始水压增大而逐渐降低，同时硬脆性减弱。声发射测试结果表明：玄武岩在水力耦合作用下的裂纹启裂为张拉破坏，在裂纹稳定扩展阶段以张拉破坏为主，以剪切破坏为辅，且这些破坏均主要发生在岩石中部；在裂纹非稳定扩展的峰后阶段，岩石破裂以剪切破坏为主。在玄武岩启裂机制认识的基础上，基于单一圆孔理论推导得到水力耦合条件下岩石裂纹启裂的临界水压破坏准则，并将其引入玄武岩水力耦合三轴试验数值仿真，分析了玄武岩水力耦合破坏过程与水压分布规律，验证了临界水压破坏准则的合理性，对于水力耦合作用下岩石破坏过程研究具有较好的参考价值。

关键词: 水力耦合, 玄武岩, 声发射, 临界水压, 破坏准则

Abstract: In order to study the crack initiation mechanism of rock under hydraulic coupling, hydraulic coupling triaxial test and acoustic emission test were carried out on Xiluodu basalt. The test results show that the peak strength of basalt increases with the increase of confining pressure, showing a typical hard brittle behavior. When the confining pressure remains unchanged, the peak strength decreases gradually with the increase of initial water pressure, and the hard brittleness decreases at the same time. The acoustic emission test results show that the crack initiation of basalt under hydraulic coupling is tensile failure, which is mainly tensile failure and supplemented by shear failure in the stable crack propagation stage, and these failures mainly occur in the middle of the rock. In the post peak stage of unstable crack propagation, the rock fracture is mainly characterized by shear failure. Based on the understanding of crack initiation mechanism, the critical hydraulic failure criterion of rock crack initiation under hydraulic coupling condition is derived with the help of the single circular hole theory, which is then introduced into the numerical simulation of basalt hydraulic coupling triaxial test. The hydraulic coupling failure process and water pressure distribution law of basalt are analyzed. The rationality of the critical hydraulic failure criterion is verified, and it has a good reference value for the study of rock failure process under hydraulic coupling.

Key words: hydraulic coupling, basalt, acoustic emission, critical water pressure, failure criterion

中图分类号: TU 453

朱泽奇, 田铠玮, 徐启钟, 崔岚, 盛谦, . 水力耦合作用下玄武岩启裂机制与临界水压研究[J]. 岩土力学, 2023, 44(S1): 83-90.

ZHU Ze-qi, TIAN Kai-wei, XU Qi-zhong, CUI Lan, SHENG Qian, . Research on crack initiation mechanism and critical water pressure of basalt under hydraulic coupling[J]. Rock and Soil Mechanics, 2023, 44(S1): 83-90.

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水力耦合作用下玄武岩启裂机制与临界水压研究

Research on crack initiation mechanism and critical water pressure of basalt under hydraulic coupling

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