摘要
采用自制水泥砂浆作为类岩石材料进行试验,研究内水压力和单轴压缩耦合作用下岩体的破坏规律。制作带有中心预制裂缝的立方体试样,利用自行研发的内水压力与轴向压力加载装置,在固定内水压力加载速度和轴向压力大小的前提下,对不同材料强度和尺寸的试样,以不同轴向压力加载方向进行了水力劈裂试验。试验结果表明:轴向压力加载方向对裂缝尖端的起裂角度有一定影响,在固定内水压力加载速度下,裂缝内水压力上升速度与试样强度正相关;轴向压力方向无论是与预制裂缝走向平行还是垂直,都会加快内水压力上升速度;试样水力劈裂临界水压力与试样强度正相关;轴向压力加载方向对单裂缝试样水力劈裂影响较大,轴向压力方向与裂缝走向垂直时对裂缝开裂起抑制作用,轴向压力方向与裂缝走向平行时对裂缝开裂起促进作用。
Self-made cement mortar was used as the rock-like materials to test the law of rock destruction under the coupling effect of water pressure and uniaxial axial compression. Under the premise of steady hydrostatic loading speed and axial pressure,cube specimens of different material strengths and sizes with prefabricated cracks in the center were made to perforin hydraulic fracture tests by a self-developed hydraulic pressure and axial compression device. The results show that the axial compression loading direction has some influence on the crack initiation angles, and the rising of the internal water pressure is positively correlated with the strength of the specimen at a steady hydrostatic loading rate. The axial compression loading direction, whether parallel or vertical to the prefabricated cracks, can accelerate the rising of internal water pressure. The critical internal water pressure of hydraulic fracture is positively correlated with the strength of the specimen. The axial compression loading direction has a greater effect on the hydraulic fracture of a specimen with a single crack. When the axial compression direction is perpendicular to the direction of the prefabricated fracture, the crack initiation is inhibited. On the contrary, when the axial compression direction is parallel to the prefabricated fracture direction, the crack cracking is promoted.
作者
徐力群
陶韵成
刘得潭
旦增赤列
XU Liqun;TAO Yuncheng;LIU Detan;DANZENG Chilie(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Jiangzi County Water Conservancy Bureau in Tibet,Shigatse 857400,China)
出处
《水利水电科技进展》
CSCD
北大核心
2018年第4期28-34,43,共8页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金青年科学基金(51509079)
关键词
类岩石材料
水力劈裂
单轴压缩
临界水压力
试验研究
rock-like materials
hydraulic fracture
uniaxial compression
critical internal water pressure
experimental study
