摘要
介绍了利用新研制的直剪试验仪所测得的膨胀岩试验结果,着重介绍了原状膨胀岩的剪切性状。试验结果表明膨胀岩原状样与重塑样在剪切性状上表现出很大的差别,前者剪切面呈现凸凹起伏的性状,凸凹起伏的剪切面相当于增大了有效剪切面积,这对试验结果有一定的影响;试验结果也同时表现出原状膨胀岩的结构性对抗剪强度起着重要作用。因此,室内重塑样剪切试验很难获得准确的膨胀岩土体的抗剪强度指标,工程上应尽量做原状或原位试验。
Experimental results of expansive rock by new developed direct shear test apparatus in particular were introduced,its shear behaviors of undisturbed sample were introduced.The results indicated significant difference of shear behavior between undisturbed expansive rock and remolded sample.The shear plane of the former shows concave-convex fluctuation,and this equal to increasing effective shear area.And these would increase discretization of test results.Besides,the results show that the structure of undisturbed expansive rock plays important roles in shear strength. So, it is very difficult to obtain accurate shear strength index from indoor experiment of remolded sample, and the undisturbed sample test or in -situ test should be applied in engineering.
出处
《地下空间与工程学报》
CSCD
北大核心
2009年第5期915-919,共5页
Chinese Journal of Underground Space and Engineering
关键词
膨胀岩
剪切性状
抗剪强度
剪切面
expansive rock
shear behavior
shear strength
shear plane
