Deformation and strength characteristics of weathered soft rock using triaxial tests
Deformation and strength characteristics of weathered soft rock using triaxial tests
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DOI：
10.1016/j.ijrmms.2004.03.024
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发表时间：
2004-05
影响因子：
7.2
通讯作者：
De’an Sun;H. Matsuoka;D. Muramatsu;T. Hara;A. Kudo;Z. Yoshida;S. Takezawa
中科院分区：
文献类型：
--
作者：
De’an Sun;H. Matsuoka;D. Muramatsu;T. Hara;A. Kudo;Z. Yoshida;S. Takezawa
研制了一种中等尺寸的三轴试验装置，用于测量风化软岩的变形和强度。采用所谓的岩心钻孔法从坝址采集了高质量的原状样品。为避免滴管测量体积变化时试件饱和对软岩结构的破坏，采用三环法直接测量非饱和状态下试件的侧向变形。利用研制的三轴试验装置，分别在98kPa、196kPa和392kPa围压下，对非饱和和饱和原状试样进行了各向同性压缩试验和固结排水三轴压缩试验。试验结果表明，试验风化软岩在非饱和和饱和条件下均具有较强的围压变形依赖性。非饱和和饱和试件的三轴试验结果对比表明，饱和后试件变得有些弱。饱和状态下，黏聚力变小，内摩擦角保持不变。
A middle size triaxial test apparatus was developed, to measure deformation and strength of a weathered soft rock. The undisturbed samples with high quality were taken from a dam site by using a socalled core drilling method. In order to avoid the damage of soft rock structure due to saturation of specimens for measuring volume change through burette, the lateral deformation of specimens was directly measured in unsaturated condition by using three rings. Using the developed triaxial test apparatus, isotropic compression tests and consolidated-drained triaxial compression tests were performed on unsaturated or saturated undisturbed samples under confining pressures of 98kPa, 196kPa and 392kPa. The test results show that the tested weathered soft rock under both unsaturated and saturated conditions has strong confining-pressure dependency of deformation. Comparison of results of triaxial tests on unsaturated and saturated specimens shows the samples become somewhat weak being saturated. Cohesion becomes small while the internal friction angle keeps constant when the sample is saturated.