基于能量守恒确定岩体结构面的抗剪强度

doi:10.13722/j.cnki.jrme.2019.0623

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摘要结构面是决定岩体力学性质的关键因素，确定其强度特性具有重要意义。基于能量守恒原理和莫尔–库仑强度准则，推导得出了岩体结构面抗剪强度的计算公式，通过室内直剪试验对其可行性进行验证，并与以往结构面强度准则进行对比，依据实际岩体构造提出了结构面抗剪强度的测试方法。研究表明：(1) 岩体结构面在剪切过程中发生了摩擦、剪断、剪胀/缩等行为，遵循能量守恒定律，利用能量守恒原理和莫尔–库仑强度准则可以计算得到结构面的抗剪强度。(2) 结构面形态特征对其抗剪强度有重要的影响，主要表现为起伏度、起伏角以及凸起部分所占比例。二维条件下，以长度为衡量标准，三维条件下，需要考虑凹凸区域所占面积比例。(3) 通过测量结构面形态和结构面壁的强度参数，简化测试方法，可以间接计算出其抗剪强度。研究结果对岩体结构面强度测试和岩体稳定性评价具有一定的意义。

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	杨烜宇1
	王闫超1
	李景皓2
	张必昌1

关键词 ：岩石力学, 能量守恒, 结构面, 抗剪强度, 强度准则

Abstract：Structural plane is the key factor to determine the mechanical properties of rock mass. The shear strength of the structural plane of rock mass is calculated based on the principle of energy conservation and Mohr-Coulomb strength criterion，and its feasibility is verified by the laboratory direct shear test，which is compared with the structural plane strength criterion proposed by previous research. And the testing method of the shear strength of the structural plane is proposed according to the actual rock mass structure. The following concussions can be obtained by the research. (1) The shear strength of the structural plane of the rock mass can be calculated by using the principle of energy conservation and Mohr-Coulomb strength criterion. (2) The morphological characteristics of the structural plane have an important influence on its shear strength，which is mainly manifested as the undulation degree，undulation angle，roughness and the proportion of the raised part. In the two-dimensional condition，the length is taken as the measurement standard，and in the three-dimensional condition，the proportion of the concave and convex region in the area should be considered. (3) The shear strength can be calculated indirectly and simply by measuring the morphological of the structural plane and the strength parameters of the structural plane wall.

Key words： rock mechanics energy conservation structural plane shear strength strength criterion

引用本文:

杨烜宇1，王闫超1，李景皓2，张必昌1. 基于能量守恒确定岩体结构面的抗剪强度[J]. 岩石力学与工程学报, 2020, 39(S1): 2674-2682.
YANG Xuanyu1，WANG Yanchao1，LI Jinghao2，ZHANG Bichang1. A method to determine the shear strength of structural plane based on energy conservation. , 2020, 39(S1): 2674-2682.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0623 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/IS1/2674

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