Experimental investigation on strength of sandstone weathered and absorbed water heavily and its constitutive law
1. Technology Center, China Railway Tunnel Group,Luoyang,Henan 471009, China;
2. School of Highway, Chang'an University,Xi'an 710064, ChinaReceived：2010-04-15 Available online：2011-01-13 13:55:11.000
According to the feature of sandstone weathered and absorbed water heavily, the authors analyzed the physical and mechanical properties and chemical composition of the sandstone experimentally, then studied influence of blasting disturbance, water content, sample bedding on stress-strain strength characteristics through uniaxial and triaxial compression tests, and found that the sandstone would become weak in the strength when it absorbed water, and its cohesion decreased and showed significant anisotropy while friction angle was not changed. After the sandstone underwent blasting, its uniaxial compressive resistance and elastic modulus decreased, and Poisson ratio increased. As the sandstone has obvious bedding properties, the strengths of sample obtained from two different loading irections are different obviously. Based on the stress-strain curves from the triaxial tests, the authors found the stress-strain curves could be described well by the modified Duncan-Zhang model.
 巫锡勇,罗健,魏有仪.岩石风化与岩石化学成分的变化研究[J].地质与勘探,2004,40(4):85-88. link1
 周维垣.高等岩石力学[ M] .北京:水利电力出版社,1990.
 沈明荣,陈建峰.岩体力学[ M] .上 海:同 济大 学出 版 社,2006 : 52 -55.
 关宝树.隧 道 工 程 设 计 要 点 集 [ M ] .北 京:人 民 交 通 出 版 社, 2003.
 张立新,李长洪.矽卡岩软化特性及其力学试验研究[J].现代矿业,2009(2):56-59. link1
 吴景浓.地壳岩石的渗透性状及孔隙水对岩石力学性质的影响[J].华南地震,1990,10(3):77-82. link1
 易顺民,赵文谦.单轴压缩条件下三峡坝基岩石破裂的分形特征[J].岩石力学与工程学报,1999,18(5):479-520. link1
 Duncan J M, Chang C Y, et al.Nonlinear analysis of stress and strain in soils[ J] .Journal of the Soil Mechanics and Foundation Division,ASCE,1970 ,96 ( SM5 ) : 1629 -1653.
 Feng Weixing, Chang Shaodong, Hu Wangyi.A study of param- eter test on fine clay soil in Beijing using the model by Duncan and Chang[ J] .Chinese Journal of Rock Mechanics and Engi- neering, 1999 , 18 ( 3 ) : 327 -330.