岩土力学2013，Vol.34Issue(2)：329-336,8.
干湿交替作用后砂岩破裂过程实时观测与分析
Real-time observation and analysis of fracturing process of sandstone under cyclic drying and wetting
摘要
Abstract
A number of integrated and pre-existing hole sandstone specimens under cyclic drying and wetting have been prepared and tested under compression with meso-mechanical testing system. The processes of crack initiation, propagation and failure behaviors of specimens are observed by microscope. After several cyclic times of drying and wetting, the cracks initiate at lower load level, and the initial cracks generally are tensile cracks. The crack propagation in integrated specimens is three-dimensional at random, but in the specimens with pre-existing hole, the cracks start to grow at the hole wall firstly. In specimens with pre-existing hole, shearing cracks initiate from the compressive stress concentrated areas of the hole wall under natural state; on the contrary, tensile cracks may initiate at the central zone of tensile stress under cyclic drying and wetting. Moreover, the cracking progress is more complicated and its rupture form is multiple. Compared with natural specimens, the specimens under cyclic drying and wetting become more ductile, and their strength parameters are lower .关键词
岩石力学/细观力学/干湿交替/单轴压缩/破裂Key words
rock mechanics/ mesomechanics/ cyclic drying and wetting/ uniaxial compression/ fracturing分类
建筑与水利引用本文复制引用
姚华彦,朱大勇,周玉新,刘心庭..干湿交替作用后砂岩破裂过程实时观测与分析[J].岩土力学,2013,34(2):329-336,8.基金项目
金属矿山安全与健康国家重点实验室开放课题基金(No.ZDSYS001) （No.ZDSYS001）
教育部高等学校博士学科点专项科研基金(No.20100111120002) （No.20100111120002）
国家自然科学基金(No.50909053,No.51179043). （No.50909053,No.51179043）
