摘要
岩石裂缝广泛存在于工程实际中,对岩体的力学性质有重要影响,研究裂缝形貌细观参数的演变及对其力学性质的影响具有重要意义。利用光学扫描仪获取砂岩裂隙面的形貌数据,建立了裂缝三维几何模型,并结合单轴加载下裂缝面的应力-位移数据揭示了裂缝开度分布、接触面积、空隙体积等细观参数的演变规律,得到结论如下:裂缝的开度分布可用韦伯密度函数描述;裂缝的接触面积和空隙体积随应力的变化规律和双曲线相似;裂隙法向变形、接触面积和平均嵌入深度的变化取决于小开度区域的占比;空隙体积的变化主要取决于大开度区域的占比。
Rock fracture widely exists in engineering practice and has an important influence on the mechanical properties of rock mass.It is of great significance to study the evolution of micro-structure parameters of fracture morphology and its influence on mechanical properties.The optical scanner was used to obtain the morphology data of the sandstone fracture surface,and a three-dimensional geometric model of the fracture was established.Combined with the stress-displacement data of the fracture surface under uniaxial loading,the evolution rules of micro-parameters such as fracture opening distribution,contact area and void volume were revealed.The conclusions were as follows.The fracture opening distribution could be described by weber density function.The change rule of contact area and void volume with stress was similar to hyperbola.The changes of normal deformation,contact area and average embedding depth depended on the proportion of small opening area.The change of void volume mainly depended on the proportion of large opening area.
作者
宋旭
周雷
苏小鹏
张海宽
SONG Xu;ZHOU Lei;SU Xiaopeng;ZHANG Haikuan(State Key Laboratory for the Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;College of Resources and Environmental Science,Chongqing University,Chongqing 400044,China)
出处
《矿业研究与开发》
CAS
北大核心
2019年第12期80-86,共7页
Mining Research and Development
基金
国家自然科学青年基金项目(51774056)
关键词
岩石裂缝
开度分布
细观结构演化
法向位移
Rock fracture
Aperture distribution
Micro-structure evolution
Normal displacement
