岩石卸荷破坏的试验研究  

Experimental Study on the Rock Behavior Under Unloading Condition

作　　者：张黎明[1] 王在泉[1] 王建新[1] 刘琼[1] 

机构地区：[1]青岛理工大学理学院,山东青岛266033

出　　处：《四川大学学报（工程科学版）》2006年第3期34-37,共4页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(49802026);山东省中青年奖励基金;山东省教育厅资助项目(J01E01)

摘　　要：对岩样进行了常规三轴加载后保持轴向变形不变的卸围压试验,得到了峰前、峰后卸围压全过程曲线。对岩样破坏特征和试验结果的分析表明:峰前卸围压岩样表现出脆性剪切破坏的特征,而峰后卸围压表现出张剪破坏的特征,峰前卸围压破坏比峰后卸围压破坏更具有突发性;峰前、峰后卸围压岩样都表现出明显的侧向扩容现象;岩样破坏时的轴向承载能力对围压都很敏感,反应了试件沿破裂面摩擦滑动的结构效应。Unloading confining pressure tests of rock specimens with fixed displacement after conventional triaxial compression are conducted. Based on the complete procedure of unloading confining pressure, the failure features and strength of specimens are analyzed. The test results show that unloading fracture type is shear failure at the pre-peak and tensile-shear failure at the post peak. Failure phenomenon is easier to happen suddenly in the process of unloading confining pressure at the pre-peak than at the post-peak. In addition, the axial supporting capacity is very sensitive to the change of confining pressure. This is the result of the mosaic community between fractured rock blocks and reflects the structure effect along friction-sliding surface.

关 键 词：卸围压 变形 承载能力 

分 类 号：TU459.1[建筑科学—岩土工程]