期刊论文

中文

岩土力学

1000-7598

2015

36

1

56-60 and 67

10.16285/j.rsm.2015.01.007

国家自然科学基金资助项目（No.51174228） 湖南省博士生科研创新项目（No.CX2012B072）

本校为第一机构

在研究双向压缩条件下压剪复合型裂纹应力分布特征及断裂破坏机制基础上,考虑渗透压对初始裂隙面上有效正应力的影响,提出高低渗透压环境的判定准则,并基于滑动裂纹模型理论及最大周向拉应力破坏准则,得到不同渗透压环境下初始裂隙尖端微裂纹起裂特征与规律。研究结果表明:压剪复合应力条件下,初始裂隙尖端发育微裂纹的最优倾角与裂隙面摩擦系数直接相关,随裂隙面摩擦系数的增大,最优初始裂隙倾角由45°起逐渐增大;低渗透压条件下,渗流场的存在使裂纹面摩擦系数发生弱化,进而使得最优初始裂隙倾角向45°靠近,而渗透压直接降低裂隙面上有效正应力且与裂隙倾角无关,其仅仅影响裂隙体材料的初裂强度...

On the basis of the fracture failure mechanism and stress distribution characteristics of compressive-shear rock cracks under biaxial compression, this paper theoretically examines the influence of seepage pressure on the effective normal stress of preexisting crack surface. Then, a judging criterion is proposed for determining whether the seepage pressure is higher or lower. It considers the stress state of the effective normal stress of preexisting crack surface. Finally, the cracking law and characteristic of microcracks, generated at the tips of preexisting crack with different seepage pre...