摘要
软岩是复杂的多相体系,存在着内在的不均匀性和孔隙性。岩体工程进入深部后,软岩进一步增加,表现出"三高一扰动"的特点,传统的岩石力学研究方法中多把软岩抽象为连续介质,忽略其不连续和不均匀性,且不考虑深部环境中温度和孔隙压的影响。本文将其视为多孔介质,从定义出发,引入动态孔隙度模型,并论证了假设的严密性,同时,考虑温度和孔隙压的影响,推导出修正的有效应力通式,最终建立了适合深部环境的软岩多孔介质模型。
Soft rock is a complex system consists of few phases,whose characteristics are non-uniform and porosity.With the development of mining engineering toward deep,soft rocks increase further and are characterized by high temperature,high ground stress and high pore pressure.Soft rocks are regarded as a continuous medium in traditional research approach of rock mechanics,whose uncontinuity and nonhomogeneity are neglected as well as the effect of temperature and pore pressure in deep environment.In this paper,the model of dynamic porosity is introduced from its definition and logical rigor is verified on the basis of regarding soft rocks as a porous medium Taking temperature and pore pressure into account,an amended general expression of effective stress is deduced,and a model of porous medium of soft rock suitable to deep environment is established finally.
出处
《煤矿安全》
CAS
北大核心
2009年第12期8-11,共4页
Safety in Coal Mines
基金
橡塑材料与工程教育部重点实验室开放基金资助项目(200706)
关键词
深部
软岩
多孔介质
温度
孔隙度
有效应力
deep soft rock porous medium temperature porosity effective stress
