裂隙岩石抗剪强度弱化临界水压力及统计损伤本构模型

谢辉; 陈英; 向勇; 王皓冉; 马芳平

doi:10.16511/j.cnki.qhdxxb.2023.26.019

清华大学学报（自然科学版） >

2023 , Vol. 63 >Issue 7: 1113 - 1123

DOI: https://doi.org/10.16511/j.cnki.qhdxxb.2023.26.019

论文

裂隙岩石抗剪强度弱化临界水压力及统计损伤本构模型

谢辉 ,
陈英 ,
向勇 ,
王皓冉 ,
马芳平

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1. 清华四川能源互联网研究院, 成都 610000;
2. 四川水发勘测设计研究有限公司, 成都 610015;
3. 清华大学水沙科学与水利水电工程国家重点实验室, 北京 100084;
4. 国能大渡河流域水电开发有限公司, 成都 610041

谢辉(1989—),男,高级工程师。

收稿日期: 2022-12-15

网络出版日期: 2023-06-27

基金资助

国家重点研发计划项目(2019YFB1310504);国家自然科学基金资助项目(U21A20157,52009064);四川省科技计划资助项目(2022YFSY0011,2023YFS0410)

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Shear strength of dam abutment fractured rock weakens critical water pressure and statistical damage constitutive model

XIE Hui ,
CHEN Ying ,
XIANG Yong ,
WANG Haoran ,
MA Fangping

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1. Sichuan Energy Internet Research Institute, Tsinghua University, Chengdu 610000, China;
2. Sichuan Water Development Investigation, Design and Research Co., Ltd., Chengdu 610015, China;
3. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;
4. CHN ENERGY Dadu River Hydropower Development Co., Ltd., Chengdu 610041, China

Received date: 2022-12-15

Online published: 2023-06-27

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摘要

水岩耦合作用下的坝肩岩石强度参数弱化效应对高拱坝枢纽的长期安全稳定运行具有重要影响。针对坝肩裂隙大理岩抗剪强度参数的水压弱化效应,首先,采用岩石力学测试系统,开展了不同渗透水压作用下裂隙岩石三轴压缩试验;其次,结合岩石应力应变曲线分析了渗透水压对裂隙岩石抗压强度、黏聚力和摩擦系数的影响;最后,基于有效应力原理,分析获得岩石的弱化临界水压力,进而研究了考虑渗透水压的岩石统计损伤本构模型。结果表明：渗透水压对裂隙大理岩抗剪强度参数的影响主要表现为其对黏聚力的弱化效应,黏聚力弱化率随渗透水压增大会大幅度增加,最大弱化率接近100%,黏聚力弱化率为0时的水压力为弱化临界水压力。弱化临界水压力作为渗透水压对岩石强度和黏聚力弱化的界限值,可用于界定渗透水压对裂隙岩石抗剪强度的影响规律。基于渗透水压对抗剪强度参数的影响,构建了考虑水压弱化效应的岩石统计损伤本构模型,并进行试验数据验证,结果表明：该模型能实现水岩耦合作用下岩石破裂全过程的演变规律计算。研究成果对裂隙岩石弱化效应与高拱坝坝肩的稳定分析具有一定的参考价值。

关键词： 裂隙岩石; 抗剪强度参数; 弱化效应; 临界水压力; 本构模型

本文引用格式

谢辉 , 陈英 , 向勇 , 王皓冉 , 马芳平 . 裂隙岩石抗剪强度弱化临界水压力及统计损伤本构模型[J]. 清华大学学报（自然科学版）, 2023 , 63(7) : 1113 -1123 . DOI: 10.16511/j.cnki.qhdxxb.2023.26.019

Abstract

[Objective] The weakening of abutment rock strength under water-rock coupling has an important impact on the long-term safe and stable operation of high-arch dams. Under the joint action of prolonged arch thrust and high water pressure, the strength parameters of the rock in the weak interlayer of the dam abutment are reduced, which readily causes long-term stability problems such as structural instability, seepage damage, and bank slope sliding of the high dam hub. [Methods] Given the water pressure weakening effect of the shear strength parameters of the fractured marble at the dam abutment, the triaxial compression test of the fractured rock under the action of different seepage water pressures was performed using the rock mechanics testing system, and then the influence of seepage water pressure on the compressive strength, cohesion, and friction coefficient of the fractured rock was analyzed in combination with the rock stress-strain curve. Finally, the weakening critical water pressure of the rock was obtained by analyzing the effective stress principle. Furthermore, the statistical damage constitutive model of rock considering seepage pressure was studied. [Results] The results showed that the influence of seepage water pressure on the shear strength parameters of the fractured marble was mainly manifested by a weakening effect on cohesion. The weakening rate of cohesion increased substantially with increasing seepage water pressure, and the maximum weakening rate was nearly 100%. The weakened cohesion decreased linearly with increasing water pressure; when the weakening rate of cohesion was 0, the water pressure was the weakening critical water pressure. When the water pressure was lower than the critical water pressure, the water pressure weakening effect of rock strength was obvious, and the cohesion decreased linearly with increasing water pressure until vanishing; when the water pressure exceeded the critical water pressure, the rock strength decreased insubstantially with increasing water pressure, and the water pressure weakening effect of rock strength was not obvious. Based on the influence of seepage water pressure on shear strength parameters, a statistical damage constitutive model of rock considering the weakening effect of water pressure was constructed, and the adaptability and rationality of the theoretical model were verified using test data. [Conclusions] The critical water pressure, as the limiting value of the weakening of the rock strength and cohesion by the seepage pressure, can be used to define the influence of the seepage pressure on the rock strength. The statistical damage constitutive model considering the weakening effect of the seepage pressure can calculate the evolution law of the entire process of rock fracture under the water-rock coupling effect. The research results provide strong support for the theory and testing of water pressure weakening and have certain reference values and scientific significance for studying the weakening effect of fractured rock and analyzing the stability of high-arch dam abutments.

Key words： fissured rock; shear strength parameters; weakening effect; critical water pressure; constitutive model

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