一种新的软−硬节理峰值剪切强度模型

doi:10.16285/j.rsm.2020.1923

岩土力学 ›› 2021, Vol. 42 ›› Issue (7): 1861-1870.doi: 10.16285/j.rsm.2020.1923

一种新的软−硬节理峰值剪切强度模型

范祥^{1, 2, 3}，邓志颖¹，崔志猛^{1, 4}，何忠明³，林杭⁵

1. 长安大学公路学院，陕西西安 710064；2. 长江水利委员会长江科学院水利部岩土力学与工程重点实验室，湖北武汉 430010； 3. 长沙理工大学湖南省公路先进建养技术国际科技创新合作基地，湖南长沙 410114；4. 广州诚安路桥检测有限公司，广东广州 510420； 5. 中南大学资源与安全工程学院，湖南长沙 410083

收稿日期:2020-12-27 修回日期:2021-03-29 出版日期:2021-07-12 发布日期:2021-07-16
通讯作者: 林杭，男，1980年生，博士，教授，主要从事边坡工程、节理力学、隧道与地下空间方面的研究工作。E-mail: linhangabc@126.com E-mail:fanxiang224@126.com
作者简介:范祥，男，1986年生，博士，副教授，主要从事岩体力学与隧道工程方面的研究工作。
基金资助:
国家自然科学青年基金项目（No. 41807241）；长江水利委员会长江科学院开放研究基金资助项目（No. CKWV2019740/KY）；长沙理工大学公路先进施工与维修技术湖南省国际科技创新合作基地开放基金资助项目（No. kfj190802）。

A new peak shear strength model for soft-hard joint

FAN Xiang^{1, 2, 3}, DENG Zhi-ying¹, CUI Zhi-meng^{1, 4}, HE Zhong-ming³, LIN Hang⁵

1. School of Highway, Chang’an University, Xi’an, Shaanxi 710064, China; 2. Key Laboratory of Geomechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research Institute of Changjiang Water Resources Commission, Wuhan, Hubei 430010, China; 3. Hunan International Scientific and Technological Innovation Cooperation Base of Advanced Construction and Maintenance Technology of Highway, Changsha University of Science & Technology, Changsha, Hunan 410114, China; 4. Guangzhou Cheng’an Testing Ttd. of Highway & Bridge, Guangzhou, Guangdong, 510420 China; 5. School of Resources and Safety Engineering, Central South University, Changsha, Hunan 410083, China

Received:2020-12-27 Revised:2021-03-29 Online:2021-07-12 Published:2021-07-16
Supported by:
This work was supported by the National Natural Science Foundation of China for Youth (41807241), CRSRI Open Research Program (CKWV2019740/KY), the Open Fund of Hunan International Scientific and Technologies Innovation Cooperation Base of Advanced Construction and Maintainance Technology of Highway, Changsha University of Science & Technology (kfj190802).

摘要/Abstract

摘要： 岩体中常存在强度不同的界面，其剪切强度影响岩体稳定，剪切强度的评估较为重要。利用3D技术打印的树脂节理板，浇注含不同粗糙度软?硬节理的不同强度水泥砂浆试样，在常法向应力下进行直剪试验和数值模拟研究，得到的剪切应力?位移的试验曲线与模拟曲线相一致。基于试验结果，引入比例系数T表征软?硬节理的组合壁面强度CCS，引入影响因子? 描述节理粗糙系数JRC、节理壁面强度JCS和法向应力?n对软?硬节理峰值剪切强度τp的综合影响效果，利用数值分析方法推导出一种估算软?硬节理峰值剪切强度的模型。试验发现：软?硬节理的残余剪切强度τr主要由JCS较低侧控制，且这种控制作用随JRC增大而增强；CCS值小的剪切应力?位移曲线率先达到峰值和进入残余阶段。研究表明：软?硬节理峰值剪切强度模型综合了JRC、JCS和?n对节理τp的影响机制，可用来评估粗糙软?硬节理的峰值剪切强度。

关键词: 软?硬节理, 直剪试验, 节理粗糙系数, 节理组合壁面强度, 峰值剪切强度模型

Abstract: Interfaces with different strengths are usually existed in rock mass, the shear strength of these interfaces plays a critical role on the stability of rock mass, and it is thus highly important to accurately evaluate their shear strength. With the help of 3D-printed resin molds, the soft-hard jointed cement specimens with different joint roughness coefficients (JRC) and joint wall compressive strengths (JCS) were fabricated to conduct laboratory tests and numerical simulation of direct shear under constant normal stress. The test curves of shear stress-displacement agree with those by numerical simulation. Based on the test results, a coefficient of proportionality T was proposed to characterize combined compressive strength CCS of soft-hard joint, and meanwhile an influence factor ? was proposed to characterize the effects of JRC, JCS and normal stress ?n on the peak shear strength of soft-hard joint by calculation and statistics method , thus a method for estimating the peak shear strength for soft-hard join surface was derived. The residual shear strength of soft-hard joint is mainly controlled by the soft joint side, and this control effect increases with the increase of JRC. The shear stress-displacement curves of soft-hard joint with smaller CCS earlier reach the peak and enter the residual stage. The study indicates that the proposed model may be used to evaluate the peak shear strength of soft-hard joint by integrating the influence mechanism of joint surface morphology, joint compressive strength and normal stress.

Key words: soft-hard joint, direct shear test, joint roughness coefficient, combined joint wall compressive strength, peak shear strength model

中图分类号: TU 451

范祥, 邓志颖, 崔志猛, 何忠明, 林杭, . 一种新的软−硬节理峰值剪切强度模型[J]. 岩土力学, 2021, 42(7): 1861-1870.

FAN Xiang, DENG Zhi-ying, CUI Zhi-meng, HE Zhong-ming, LIN Hang, . A new peak shear strength model for soft-hard joint[J]. Rock and Soil Mechanics, 2021, 42(7): 1861-1870.

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一种新的软−硬节理峰值剪切强度模型

A new peak shear strength model for soft-hard joint

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