三轴压缩条件下胶结充填体能量耗散特征分析  

Energy dissipation properties of cement backfill body under triaxial compression conditions

作　　者：徐文彬[1] 宋卫东[2] 王东旭[2] 杨宝贵[1] 潘卫东[1,3] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]北京科技大学土木与环境工程学院,北京100083 [3]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《中国矿业大学学报》2014年第5期808-814,共7页Journal of China University of Mining & Technology

基　　金：国家科技支撑计划课题(2009BAB48B02);国家重点基础研究发展计划(973)项目(2013CB227903);煤炭资源与安全开采国家重点实验室开放课题(SKLCRSM11KFB05)

摘　　要：开展不同灰砂配比、质量分数的充填体三轴压缩试验,研究了不同围压加载阶段充填体的能量耗散与围压、应变以及应力的内在关系.结果表明,在低围压时,充填体的极限抗压强度低;随着围压的增加,充填体的峰值强度随之增大,峰前能耗占总能耗的比重越来越大,说明充填体屈服阶段吸收的能量占总能量的比重提高,围压的增大能够提高充填体的破坏能耗量;充填体的峰前能耗量、峰后能耗量、单位体积变形能以及总能耗与围压呈二次函数曲线关系.当围压一定时,充填体在弹性变形阶段的能量变化与轴向应力、偏应力均呈线性关系,与轴向应变呈指数函数曲线关系;随着轴向载荷增加,能量随轴向应力、偏应力变化的增长速率加大.In order to investigate the relationship between energy dissipation and confining pres- sure, stress and strain, triaxial compressed experiments were conducted on backfill body sam- ples. Results show that the maximum compressive strength of backfill body under a low confi- ning pressure is relatively small. The peak strength increases with increasing confining pres- sure, and the amount of energy at the yield deformation stage occupies a large proportion of the total energy, indicating that the proportion of the absorbed energy at the yield deformation stage is increased and the confining pressure can increase the failure energy of backfill body. A quadratic function can be used to describe the relations between total energy consumption, the confining pressure and the amount of energy dissipation before and after yield deformation stage, and the unit volume strain energy. Under a certain confining pressure, the energy change of backfill body shows a positive linear relation with the axial stress and deviatoric stress, and an exponential relation with the axial strain. With increasing axial stress, the ener- gy-change accelerates with respect to axial stress and deviatoric stress.

关 键 词：充填体 三轴压缩 变形 能量耗散 

分 类 号：TU44[建筑科学—岩土工程]