岩土力学2011，Vol.32Issue(12)：3611-3617,7.
砂岩加卸载条件下能耗特征试验研究
Experimental study of energy features of sandstone under loading and unloading
摘要
Abstract
In order to get the features of energy absorption and dissipation of sandstone under loading and unloading, the tests of uniaxial compression, triaxial compression and post-peak unloading confining pressure have been performed on sandstone with the MTS81.5 servo-controlled test machine. The results show that the dissipated energy of sandstone increases from uniaxial compression test through post-peak unloading test to triaxial compression test. The dissipated energy in triaxial compression and post-peak unloading confining pressure tests increases linearly with the confining pressure. Under uniaxial compression, the sandstone presents abrupt brittle failure and the elastic strain energy initially stored in the sandstone is instantly transformed into dissipated energy which is the power source of all phenomena of the rock failure. Under triaxial compression, the sandstone demonstrates progressive failure, I.e. the failure of sandstone is the process of from local cracking to global destruction in which the dissipated energy gradually increases with deformation. When the deformation reaches a critical level, the residual energy stored in sandstone will be rapidly released and the sandstone globally destructed.关键词
应力路径/能量耗散/能量释放/三轴压缩/峰后卸围压Key words
stress paths/ energy dissipation/ energy release/ triaxial compression/ post-peak unloading confining pressure分类
建筑与水利引用本文复制引用
许国安,牛双建,靖洪文,杨圣奇,王文龙..砂岩加卸载条件下能耗特征试验研究[J].岩土力学,2011,32(12):3611-3617,7.基金项目
国家自然科学基金项目(No.50674083,No.50709008) （No.50674083,No.50709008）
国家十一五科技支撑计划(No.2008BAB36B07) （No.2008BAB36B07）
江苏省土木工程研究生科技创新基金资助. （）
