基于有效受剪面积的节理面吻合度量化方法研究

doi:10.16285/j.rsm.2022.0092

岩土力学 ›› 2023, Vol. 44 ›› Issue (S1): 249-258.doi: 10.16285/j.rsm.2022.0092

基于有效受剪面积的节理面吻合度量化方法研究

王文东^{1, 2}，邓华锋^{1, 2}，李建林^{1, 2}，冯云杰^{1, 2}，李冠野^{1, 2}，齐豫^{1, 2}

1. 三峡大学三峡库区地质灾害教育部重点实验室，湖北宜昌 443002；2. 三峡大学土木与建筑学院，湖北宜昌 443002

收稿日期:2022-01-18 接受日期:2022-03-23 出版日期:2023-11-16 发布日期:2023-11-17
通讯作者: 邓华锋，男，1979年生，博士，教授，主要从事岩土工程方面的教学与研究工作。E-mail：dhf8010@ctgu.edu.cn E-mail:1149886374@qq.com
作者简介:王文东，男，1995年生，硕士研究生，主要从岩土工程方面的研究。
基金资助:
国家自然科学基金资助项目（No. U2034203，No. U22A20600）；中国水利水电科学研究院水利部水工程建设与安全重点实验室开放研究基金（No. 202001）

Quantitative method of joint matching degree based on effective shear area

WANG Wen-dong^{1, 2}, DENG Hua-feng^{1, 2}, LI Jian-lin^{1, 2}, FENG Yun-jie^{1, 2}, LI Guan-ye^{1, 2}, QI Yu^{1, 2}

1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area，China Three Gorges University, Yichang, Hubei 443002, China; 2. College of Civil Engineering & Architecture, China Three Gorges University, Yichang, Hubei 443002, China

Received:2022-01-18 Accepted:2022-03-23 Online:2023-11-16 Published:2023-11-17
Supported by:
This work was supported by the National Natural Science Foundation of China (U2034203, U22A20600) and the Open Fund of Key Laboratory of Water Engineering Construction and Safety of Ministry of Water Resources (202001).

摘要/Abstract

摘要： 节理粗糙度系数-节理抗压强度（JRC-JCS）模型为岩体节理面抗剪强度估算提供了很好的思路，但对于吻合度较差的节理岩体，该模型往往过高地估算其抗剪强度。节理粗糙度系数-节理吻合系数（JRC-JMC）模型进一步考虑节理吻合度对抗剪强度的影响，为吻合程度较差的节理面的抗剪强度估算提供了很好的思路，但目前节理吻合度的量化分析还存在困难。在以往研究基础上，采用重复剪切试验的方法制备了不同吻合度的节理岩体试样，综合节理面形貌特征和节理面抗剪性能变化规律分析，提出了节理吻合度的量化计算方法。研究结果表明：（1）在重复剪切作用下，岩体节理面的抗剪强度和节理面形貌参数呈现先陡后缓的降低趋势，节理面上下盘的吻合程度逐渐降低；（2）根据剪切前后节理面形貌特征的对比分析，确定了剪切过程节理面的有效接触区域，提出了节理吻合系数JMC的量化计算方法；（3）对比分析表明，与单独考虑JRC相比，将JRC和JMC综合在一起可以更好地反映节理形貌特征对其剪切性能的影响。相关研究方法和分析结果可为岩体节理面抗剪性能分析提供较好的参考。

关键词: 节理岩体, 抗剪强度, 重复剪切, 吻合系数, 粗糙度系数

Abstract: JRC-JCS model provides a good idea for estimating the shear strength of joint surface, but it often overestimates the shear strength of jointed rock mass with poor consistency. The JRC-JMC model further considers the effect of joint matching degree on shear strength, which provides a good idea for estimating the shear strength of joint surface with poor joint matching degree. However, there are still difficulties in quantitative analysis of joint matching degree at present. Based on the analysis of the morphological characteristics of joint plane and the variation law of shear performance of joint surface, the quantitative calculation method of joint matching degree was proposed. The results show that: 1) Under the action of repeated shear, the shear strength of the jointed rock mass and the morphology parameters of the joint plane show a trend of decreasing first steeply and then slowly, and the matching degree between the upper and lower walls of joint surface decreases gradually. 2) According to the comparative analysis of joint surface topography before and after shear, the effective contact area of joint surface during shear process is determined, and the quantitative calculation method of joint matching coefficient JMC is proposed. 3) The comparative analysis shows that combining JRC and JMC can better reflect the influence of joint morphology characteristics on shear performance compared with the consideration of JRC alone. The related research methods and analysis results can provide a reference for the shear behavior analysis of joint surface.

Key words: jointed rock mass, shear strength, repeated shear, joint matching coefficient, joint roughness coefficient

中图分类号: TU 452

王文东, 邓华锋, 李建林, 冯云杰, 李冠野, 齐豫, . 基于有效受剪面积的节理面吻合度量化方法研究[J]. 岩土力学, 2023, 44(S1): 249-258.

WANG Wen-dong, DENG Hua-feng, LI Jian-lin, FENG Yun-jie, LI Guan-ye, QI Yu, . Quantitative method of joint matching degree based on effective shear area[J]. Rock and Soil Mechanics, 2023, 44(S1): 249-258.

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基于有效受剪面积的节理面吻合度量化方法研究

Quantitative method of joint matching degree based on effective shear area

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