预制节理岩体试件强度及破坏模式的试验研究

›› 2013, Vol. 34 ›› Issue (5): 1235-1241.

预制节理岩体试件强度及破坏模式的试验研究

刘红岩^{1, 2}，黄妤诗¹，李楷兵³，张吉宏^{4, 5}

1. 中国地质大学（北京）工程技术学院，北京 100083；2. 西藏大学工学院，拉萨 850000；3. 北京荣创科宏岩土工程有限公司，北京 100083；4. 长安大学地质工程与测绘学院，西安 710064；5. 中国有色金属工业西安勘察设计研究院，西安 710064

收稿日期:2012-03-04 出版日期:2013-05-10 发布日期:2013-05-14
作者简介:刘红岩，男，1975年生，博士，副教授，主要从事岩土工程方面的教学与科研工作。
基金资助:
中央高校基本科研业务费专项资金项目(No. 2010ZY45)；国家自然科学基金项目(No. 41002113/41162009)；教育部科学技术研究重点项目(No. 211175)。

Test study of strength and failure mode of pre-existing jointed rock mass

LIU Hong-yan^{1, 2}，HUANG Yu-shi¹，LI Kai-bing³，ZHANG Ji-hong^{4, 5}

1. College of Engineering & Technology, China University of Geoseiences (Beijing), Beijing 100083, China; 2. School of Engineering, Tibet University, Lasha 850000, China; 3. Beijing Rongchuang Kehong Rock and Soil Engineering Limited Corporation, Beijing 100083, China; 4. School of Geology Engineering and Geomatics, Chang’an University, Xi’an 710064, China; 5. Xi’an Engineering Investigation and Design Research Institute of China National Non-ferrous Metals Industry, Xi’an 710064, China

Received:2012-03-04 Online:2013-05-10 Published:2013-05-14

摘要/Abstract

摘要： 采用相似材料模型试验对不同节理倾角、节理贯通度、节理组数、载荷应变率、试件长径比、节理充填物厚度及类型等7种工况下的预制节理岩体在单轴压缩下的峰值强度及破坏模式进行了研究。结果表明：节理岩体的破坏模式及峰值强度与节理构造形态密切相关。贯通节理岩体将产生沿节理面的剪切破坏或穿切节理面破坏，且与第1种破坏模式对应的岩体峰值强度更低。非贯通节理岩体的强度介于完整岩体和贯通节理岩体之间。随着平行节理组数的增加，岩体峰值强度逐渐下降。随着载荷应变率的增加，岩体峰值强度逐渐增大，相应地试件的破坏模式也变得更加复杂。试件长径比基本没有改变其破坏模式，完整试件仍主要是以张拉破坏为主，而节理试件仍以剪切破坏为主。随着长径比增加，试件峰值强度逐渐增大。随着节理充填物厚度增加，试件峰值强度降低。不同节理填充物对试件峰值强度也有一定影响。

关键词: 预制节理岩体, 单轴压缩, 节理性质, 峰值强度, 破坏模式, 试验

Abstract: Strength and failure modes of pre-existing jointed rock mass with different joint dip angles, joint discontinuity degrees, joint sets, load strain ratios, slenderness ratios, joint filling’s depths and its sort under uniaxial compression are studied by means of similar material model tests. The results show that failure modes and peak strength of jointed rock mass are much related to joint configuration. Shear failure along or tensile failure across the joint face will occur in the continuous jointed rock mass, in which the peak strength is less corresponding to the first failure mode. To discontinuous jointed rock mass, its peak strength lies between that of intact rock and continuous jointed rock mass. With increase of parallel joint sets’ number, strength of rock mass gradually decreases. With increase of loading strain ratio, peak strength of rock mass gradually increases; and its failure mode becomes complicated. The slenderness ratio does not change the failure mode of the rock mass; and the intact specimens mainly show tensile failure; while the jointed ones mainly show shear failure. With increase of the slenderness ratio, the peak strength gradually increases; while to joint filling’s depth, it is reverse. The effect of different joint’s fillings on the specimen’s strength exists.

Key words: pre-existing jointed rock mass, uniaxial compression, properties of joint, peak strength, failure mode, test

中图分类号:

TU 443

刘红岩，黄妤诗，李楷兵，张吉宏 . 预制节理岩体试件强度及破坏模式的试验研究[J]. , 2013, 34(5): 1235-1241.

LIU Hong-yan ，HUANG Yu-shi ，LI Kai-bing ，ZHANG Ji-hong . Test study of strength and failure mode of pre-existing jointed rock mass[J]. , 2013, 34(5): 1235-1241.

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