砂土的高压卸荷特性试验  

Experimental on unloading properties of sand under high pressure

作　　者：马金荣[1,2] 崔广心[2] 秦勇[3] 周国庆[1,2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [2]中国矿业大学建筑工程学院,江苏徐州221008 [3]中国矿业大学资源与地球科学学院,江苏徐州221008

出　　处：《煤炭学报》2008年第11期1239-1242,共4页Journal of China Coal Society

基　　金：国家自然科学基金重点资助项目(50534040);中国科学院知识创新工程重大资助项目(KZCX1-SW-04)

摘　　要：运用自行研制的SKA-1型高压固结仪模拟深层土应力环境,在高围压状态下对重塑砂土的卸载特性进行了试验研究,揭示K0固结加、卸载过程中砂土K0值的变化规律、土的应力-应变关系等力学特征.结果表明:砂土卸载过程K0值随卸除荷载不同而具有不同的变化规律;在卸除轴压应力路径p-εa坐标系中,砂土的应力-应变关系为幂函数型.A series of experiments were conducted to investigate the unloading properties of remolded sand under high confining pressure by using high pressure consolidation apparatus of type SKA - 1, developed by author, to simulate stress environment of deep soil, reveal stress-strain relation and changing rule of K0 of sand during loading or unloading process after K0 consolidation. The results show that changing rule of K0 is different along with load in unloading. Stress-strain relationship of sand in unloading axial pressure can be described by power function in P-εa coordinate system.

关 键 词：砂土 高压K0固结仪 卸载特性 

分 类 号：TU441.4[建筑科学—岩土工程]