破碎砂岩承压变形时间相关性试验  

Experimental Study of Time-Dependent Deformation of Broken Sandstones Under Pressure

作　　者：樊秀娟[1] 茅献彪[1] 

机构地区：[1]中国矿业大学理学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2007年第4期486-489,共4页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金重大项目(50490270);国家重点基础研究发展规划(973)项目(2005CB221502);江苏省自然科学基金项目(BK2004033)

摘　　要：破碎岩石的承压变形具有明显的时间效应,文中自行设计了破碎岩石承压变形仪,结合摆锤杠杆式压力机建立破碎岩石的蠕变测试方法,并针对破碎砂岩开展了相关蠕变试验研究,总结得出蠕变变形与轴向载荷、破碎块径等的关系.结果显示,在金属缸筒试验条件下破碎岩石不出现加速蠕变阶段;大载荷破碎岩样的蠕变变形余量较小载荷时小;载荷增加,稳定蠕变前的变形行程随之增加,块径对破碎岩样计入蠕变后的变形量影响逐渐减小,各块径破碎岩样的稳定蠕变曲线逐渐接近.The compressive deformation of broken rocks is obviously characterized by time-dependence. Aiming at this problem, we have designed a creep-testing instrument for broken rocks, proposed the corresponding experimental approach based on a pendulum-lever loading system, and performed some creep tests for broken sandstones, obtaining the relation of creep to axial pressure and block size. The results show that 1） the rocks don＇t have a creep-accelerating stage under the condition of steel cylinder, 2） the creep deformation allowance is smaller under a heavy load than under a light load, 3） with the increase of load, the deformation before the stable creeping increases and the effect of block size on general deformation keeps decreasing, and so the creep curves of blocks with different sizes show nearly the same pattern.

关 键 词：破碎岩石 承压变形 时间相关性 试验 

分 类 号：TD452[矿业工程—矿山机电]