考虑环境劣化非贯通节理岩体的直剪试验离散元模拟

doi:10.16285/j.rsm.2017.09.034

›› 2017, Vol. 38 ›› Issue (9): 2728-2736.doi: 10.16285/j.rsm.2017.09.034

考虑环境劣化非贯通节理岩体的直剪试验离散元模拟

蒋明镜^{1, 2, 3}，刘蔚^{1, 2, 3}，孙亚^{1, 2, 3}，张宁^{1, 2, 3}，王华宁^{1, 4}

1. 同济大学土木工程防灾国家重点实验室，上海 200092；2. 同济大学岩土及地下工程教育部重点实验室，上海 200092； 3. 同济大学土木工程学院地下建筑与工程系，上海 200092；4. 同济大学航空航天与力学学院，上海 200092

收稿日期:2015-06-26 出版日期:2017-09-11 发布日期:2018-06-05
作者简介:蒋明镜，男，1965 年生，博士，教授，博士生导师，国家杰出青年科学基金获得者，主要从事太空土、深海能源土、天然结构性黏土、砂土、非饱和土宏微观试验、本构模型和数值分析方面的研究工作。
基金资助:
国家重点基础研究发展规划（973）项目（No.2011CB013504，No.2014CB046901）；国家杰出青年科学基金（No.51025932）。

Discrete element simulation of direct shear test on rock mass containing discontinuous joints with environmental degradation

JIANG Ming-jing^{1, 2, 3}, LIU Wei^{1, 2, 3}, SUN Ya^{1, 2, 3}, ZHANG Ning^{1, 2, 3}, WANG Hua-ning^{1, 4}

1. Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical & Underground Engineering, Ministry of Education, Tongji University, Shanghai 200092, China; 3. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 4. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China

Received:2015-06-26 Online:2017-09-11 Published:2018-06-05
Supported by:
The research was supported by the Key Basic Research Project of China (973 Program) (2011CB013504, 2014CB046901), the National Science Foundation for Distinguished Young Scholars (51025932).

摘要/Abstract

摘要： 非贯通节理岩体的强度特性是大型边坡、隧道等工程安全性的重要影响因素。随着酸雨、河流污染等对岩石环境劣化程度的加剧，考虑环境劣化因素对非贯通节理岩体强度的影响很有必要。采用离散元法，基于已有的胶结接触模型，将岩体因环境作用而劣化等效为岩石试样质量损失不断加剧的过程，最后等效为颗粒和颗粒之间的物质不断溶蚀的过程，由此建立考虑环境劣化的微观接触模型并将其植入离散元软件中，模拟分析了不同环境劣化程度的非贯通节理岩体在不同连通率和不同法向应力下的直剪试验。结果表明：不同环境劣化程度非贯通节理岩体剪切应力-位移曲线趋势一致；随环境劣化程度的加深，节理岩体的破坏形式以拉裂纹为主转变为以剪切裂纹为主；环境劣化使得节理岩体直剪试验起裂应力降低，且环境劣化程度的加深会导致非贯通节理岩体的凝聚力降低及内摩擦角减小，表现为峰值剪切强度降低。

关键词: 环境劣化, 非贯通节理岩体, 直剪试验, 离散元模拟

Abstract: The strength property of the intermittent jointed rock mass is an important factor which affects the safety of large slope and tunnels. With the increasing degree of environmental degradation induced by the acid rain, pollution and other factors, it is necessary to study its influence on the mechanical properties of intermittent jointed rock mass. Based on the existing bond contact model, a novel bond contact model, in which the process of environmental degradation was simplified ultimately as the constantly dissolution of bond between the particles, was established and implemented into a commercial distinct element code. Then, a series of direct shear tests with different connectivity rates and normal stresses under various degree of environmental degradation was conducted in DEM. The results imply that there is a similar tendency of shear stress-displacement curves obtained from intermittent jointed rock mass samples with varying degree of environmental degradation. And with the increasing of environmental degradation degree, the main failure mode of intermittent jointed rock mass changes from tensile crack to shear crack. In addition, the initiation stress, the cohesion and internal friction angle of non-penetrating jointed rock mass are reduced with the increasing of environmental degradation degree.

Key words: environmental degradation, intermittent jointed rock mass, direct shear test, DEM simulation

中图分类号:

TU 411

蒋明镜，刘蔚，孙亚，张宁，王华宁 . 考虑环境劣化非贯通节理岩体的直剪试验离散元模拟[J]. , 2017, 38(9): 2728-2736.

JIANG Ming-jing, LIU Wei, SUN Ya, ZHANG Ning, WANG Hua-ning, . Discrete element simulation of direct shear test on rock mass containing discontinuous joints with environmental degradation[J]. , 2017, 38(9): 2728-2736.

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考虑环境劣化非贯通节理岩体的直剪试验离散元模拟

Discrete element simulation of direct shear test on rock mass containing discontinuous joints with environmental degradation

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