含预制节理岩体卸荷条件下力学特性试验研究

›› 2012, Vol. 33 ›› Issue (11): 3257-3262.

含预制节理岩体卸荷条件下力学特性试验研究

王瑞红¹，李建林¹，蒋昱州²，王宇¹

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. 长江科学院水利部岩土力学与工程重点实验室，武汉 430010

收稿日期:2012-08-08 出版日期:2012-11-12 发布日期:2012-11-14
作者简介:王瑞红，女，1981年生，博士，副教授，主要从事边坡岩体开挖卸荷力学特性方面的研究工作。
基金资助:
国家自然科学基金资助项目(No. 51109120，No. 51009083)；湖北省教育厅项目(No. Q20101201)；宜昌市科学技术研究与开发项目(No. A2012-302-04，No. A2012-302-03)。

Experimental research on mechanical property of rock mass with prefabricated joints under unloading condition

WANG Rui-hong¹，LI Jian-lin¹，JIANG Yu-zhou²，WANG Yu¹

1. Key Laboratory of Geological Hazards in Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang, Hubei 443002, China; 2. Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China

Received:2012-08-08 Online:2012-11-12 Published:2012-11-14

摘要/Abstract

摘要： 节理对卸荷条件下岩体的力学性质有重要影响。通过含2条不同间距预制断续节理岩体的三轴卸荷破坏试验，研究了节理岩体在卸荷应力条件下的应力-应变特征、强度、变形特征、破坏规律及节理间距对岩体力学性质的影响。研究表明：相比于完整岩体，节理岩体卸荷破坏时从峰值强度跌落至残余强度过程中轴向应变较大，为完整岩体的3～4倍，岩体破坏时极限强度明显低于完整岩体，脆性特征不如完整岩体明显；节理岩体卸荷破坏时，变形模量有较大幅度的降低，其降低程度是同条件下完整岩体的6～7倍，节理间距越大，变形模量降低程度越大；与含预制节理岩样三轴加载试验结果相比，节理岩体卸荷条件下破坏程度更为强烈，除剪切破裂面外，沿最大主应力方向分布的不同级别的张性裂隙非常发育，预制节理的间距对岩体破坏形态影响不大。

关键词: 预制节理, 卸荷, 力学特性, 试验研究

Abstract: Joints have a great influence on mechanical properties of rock under unloading condition. The stress-strain characteristics and the influences of rock mass strength, deformation characteristics, failure law, joint spacing and depth on the mechanical properties of rock mass are analyzed, based on the triaxial unloading destruction experiment of the rock mass with two prefabricated intermittent joints with different spaces. The results show as follows: Comparing to the completed rock mass, the axial strain of the jointed rock during the process of falling from the peak strength to residual strength in unloading failure is 3-4 times larger than the completed rock mass; and the ultimate strength is significantly lower than the completed rock mass; also the brittle feature is not obvious as the completed rock mass. During unloading failure, the deformation modulus of the jointed rock mass reduces significantly, which the reducing degree is 6-7 times larger than the completed rock mass; and the deformation modulus decreases faster with the increase of joint spacing. Comparing to the triaxial loading experiment results of the rock mass with prefabricated joints, the damage degree of the jointed rock mass under unloading condition is more intense; in addition to the shear fracture plane, the tensile cracks of different classes distributed along the direction of maximum principal stress are well developed; and the space of prefabricated joints has little effect on the rock mass failure mode.

Key words: prefabricated joints, unloading, mechanical property, experimental research

中图分类号:

TU 452

王瑞红，李建林，蒋昱州，王宇 . 含预制节理岩体卸荷条件下力学特性试验研究[J]. , 2012, 33(11): 3257-3262.

WANG Rui-hong ，LI Jian-lin ，JIANG Yu-zhou ，WANG Yu . Experimental research on mechanical property of rock mass with prefabricated joints under unloading condition[J]. , 2012, 33(11): 3257-3262.

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