两种岩石的不同类型渗透特性实验及其机理分析  

Permeability characteristics experiment and its mechanism analysis of two types of rocks

作　　者：李长洪[1,2] 张立新[1,2] 姚作强[2] 张吉良[1,2] 苗胜军[1,2] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]北京科技大学土木与环境工程学院,北京100083

出　　处：《北京科技大学学报》2010年第2期158-163,共6页Journal of University of Science and Technology Beijing

基　　金：国家重点基础研究发展计划资助项目(No.2010CB731501;No.2010CB731506)

摘　　要：为研究岩石不同渗透特性,对石灰岩和闪长岩进行了瞬态渗透实验,研究了岩样全应力-应变过程中的渗透率演化规律以及孔隙压差与时间的关系,并建立了岩样变形破坏过程的应变-渗透率方程,最后分析了这两种不同类型岩石渗透机理.实验结果表明,闪长岩的渗透率在峰前很低且基本不变,在峰值强度时产生"突跳"现象,石灰岩的渗透率在岩石强度峰值前后随岩石变形逐渐增大.应变-渗透率曲线的拟合方程更能深刻描述岩石破裂过程的渗透规律,孔隙压差与时间的变化关系呈一元四次多项式的关系.岩石渗透性与岩石的应力状态和岩石内部结构及力学性质有关.To study the different permeability characteristics of rock, transient permeability tests of limestone and diorite were carried out. The permeability evolution and the relation between pore pressure and time of rock specimens during the complete stress-strain course were investigated. The strain-permeability equations of rock specimens during the deformation and failure course were set up. Finally, the penetration mechanism of two types of rocks was analyzed. The result shows that the phenomenon of the sudden jump of permeability occurs at the peak strength and keeps very low unchanged permeability before the peak strength for diorite. But limestone＇s permeability gradually increases with increasing deformation before and after the peak strength. The fitted equations for the strain-permeability curve more deeply describe the permeability characteristics in compressive failure. The relation between pore pressure and time is quartic polynomial with one unknown. The rock permeability has relations with the stress state and the internal structure and the mechanical properties of rock.

关 键 词：石灰岩 闪长岩 渗透实验 孔隙压差 渗透机理 突水 

分 类 号：TU452[建筑科学—岩土工程]