中等风化砂岩和泥质粉砂岩力学特性试验研究  

Experimental study on mechanical properties of moderately weathered sandstone and argillaceous siltstone

作　　者：张本蛟 梅灿 傅旭东[3] Zhang Benjiao;Mei Can;Fu Xudong(Hubei Province Engineering Consulting Co.,Ltd.,Wuhan Hubei 430000,China;China Railway 11 Bureau Group City Railway Engineering Co.,Ltd.,Wuhan Hubei 430061,China;School of Civil Engineering,Wuhan University,Wuhan Hubei 430072,China)

机构地区：[1]湖北省工程咨询股份有限公司,湖北武汉430000 [2]中铁十一局集团有限公司,湖北武汉430061 [3]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《山西建筑》2023年第16期86-89,共4页Shanxi Architecture

基　　金：国家自然科学基金面上项目(51378403)。

摘　　要：对中等风化砂岩和泥质粉砂岩试件开展无侧限抗压强度试验、三轴压缩试验和竖向循环荷载试验,研究了围压、循环荷载比等因素对两种原状极软岩试样的抗压强度、变形模量、累积变形的影响。试验结果表明:试样在围压作用下先为体缩后变为体胀,试样开始发生体胀时对应的应变比应力达到峰值时的破坏应变略小;围压越大,软岩试样脆性越显著。随着循环荷载比的增大,试样轴向累积塑性应变由稳定型转变为破坏型。In order to study the influences of confining pressure and cyclic load ratio on the compressive strength,deformation modulus and cumulative deformation of two original extremely soft rock samples,unconfined compressive strength tests,triaxial compression tests and vertical cyclic load tests were carried out on moderately weathered sandstone and argillous siltstone samples.The test results show that the specimen first shrinks and then expands under confining pressure,and the corresponding strain when the specimen begins to expand is slightly smaller than the failure strain when the stress reaches its peak.The greater the confining pressure,the more significant the brittleness of the soft rock sample.With the increase of cyclic load ratio,the axial cumulative plastic strain changes from stable type to destructive type.

关 键 词：软岩 无侧限抗压强度试验 三轴压缩试验 循环荷载比 累积塑性应变 

分 类 号：TU452[建筑科学—岩土工程]