【摘要】 岩体结构面的抗剪强度是表征岩体强度的一项重要参数,但由于原位试验受场地等诸多因素影响,难以大规模的开展,本文提出在室内用结构面大型剪切试验开展结构面的剪切特性研究,以某水电站坝基砂岩岩体中的硬性结构面为研究对象,取得了较好的成果。试验表明:结构面的多组剪切变形曲线具有一定的应变硬化的特征;达到峰值剪切强度时的剪切位移普遍较大,在8.9mm~44.5mm之间;砂岩中硬性结构面光滑面的“基本摩擦角”为31.4°,结构面“平均起伏角”为6.3°。更多还原

【Abstract】 Actual values of shear strength parameters are important to rock mass as bedrock foundation of hydropower station dam.This paper presents large shear tests to measure the shear strength parameter values of the bedding planes sandstone in laboratory.The sandstone is excavated from the bedrock of a hydropower station dam.By means of the large shear tests,the characters of shear strength about sandstone structural planes are examined.Therefore good results are obtained.The tests show that the characters of the shear deformation curves are strain hardening and the displacements are up to 8.9 mm～44.5 mm before reaching to the peak points of shear strength.At the same time,the basic friction angle of the bedding plane is 31.4 °.The average undulant angle of the bedding is 6.3°.更多还原