摘要
从物理化学作用和力学作用两个方面分析了裂缝吸水后对泥页岩强度的影响。由于泥页岩粘土矿物具有吸水特征,并遇水软化和水化膨胀。从泥页岩微观结构分析了水分子进入岩体基质后降低矿物颗粒间的相互胶结作用,并建立了含水量对泥页岩黏聚力和内摩擦角关系。进一步从力学角度研究水分子进入裂缝对裂纹尖端的颗粒施加液压使颗粒受到拉伸应力,从而使微裂纹起裂,并结合岩石力学、细观断裂力学理论计算出初裂强度。与实验结果进行对比得出相关结论。
From aspects of physical-chemical action and mechanical action,the change of rock mass strength after absorbing water was analyzed.The results show that because the mud shale clay mineral has the hygroscopic quality,it will soften and swell when meet-ing water.From aspect of the mud shale microstructure analysis,after water molecules enter into rock matrix,cementation among miner-al particles is decreased,and relationship of water content with the mud shale sticky cohesion and internal friction angle is founded.Further more,from mechanic aspect,water molecules impose hydraulic on the crack tip of the particles after entering into the rock crack and make the particles be given tensile stress so that micro-cracks become bigger.Combining with rock mechanics,micro-fracture mechanics theory,the initial rupture strength can be caculated.And when this data are compared with the experimental re-sults,related conclusion can be gained.
出处
《辽宁化工》
CAS
2010年第8期854-857,共4页
Liaoning Chemical Industry
关键词
井壁失稳
劈裂作用
断裂韧度
强度因子
软化作用
Wall instability
Slabbing action
Fracture toughness
Intensity factor
Softening action
