干湿循环作用对大理岩渗透性影响的试验研究  

Experimental Study of Permeability of Marble under Dry-wet Cycling Effect

作　　者：秦志军 龚传根 朱鹏辉[2,3] 李雪浩 王伟 Qin Zhijun;Gong Chuangen;Zhu Penghui;Li Xuehao;Wang Wei(The Communications Planning,Surveying & Design Institute of Shanxi Province,Taiyuan 030012,China;Key Laboratory of Ministry of Education for Geomechanics & Embankment Engineering,HohaiUniv.,Nanjing 210098,China;Geotechnical Research Institute,College of Civil & Transportation Engineering,Hohai Univ.,Nanjing 210098,China)

机构地区：[1]山西省交通规划勘察设计院,太原030012 [2]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [3]河海大学土木与交通学院岩土所,南京210098

出　　处：《三峡大学学报（自然科学版）》2019年第3期6-10,共5页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金资助项目(11672343)

摘　　要：本文以锦屏大理岩为研究对象,采用干湿循环处理,开展不同干湿循环次数和围压加卸载条件下大理岩气体渗透性试验,研究了大理岩渗透率随围压和干湿循环次数的变化规律.同时通过电镜扫描,探究了不同干湿循环作用对大理岩细观结构的影响效应,分析了干湿循环对大理岩的细观作用机理.试验结果表明:气体渗透性试验中,在相同围压下,大理岩渗透率随干湿循环次数的增加而递增,在同一干湿循环次数下,大理岩的渗透率随围压增大而减小;干湿循环次数越高,围压对渗透率的影响效应越显著;随着干湿循环次数增加,微裂纹不断扩展并相互搭接,大理岩块状构造逐步破碎化.In order to study the permeability of Jinping marble after dry-wet cycling treatment,gas permeability tests under different dry-wet cycles with loading and unloading of confining pressure are carried out.Meanwhile,the effect of dry-wet cycling on the mesostructure of the marble are investigated by scanning electron microscopy(SEM);and the mesoscopic mechanism of wet-dry cycling on the marble is also analyzed.The results show that under the same confining pressure,the permeability of marble increases with the increase of the number of dry-wet cycles;and under the same number of dry-wet cycle,the permeability of marble decreases with the increase of confining pressure.The effect of confining pressure on permeability is significantly enhanced by dry-wet cycling.With the number of dry-wet cycle,the microcracks continue to expand and overlap,and the marble block structure gradually becomes fragmented.

关 键 词：大理岩 干湿循环 气体渗透性试验 电镜扫描实验 围压 

分 类 号：TU458[建筑科学—岩土工程]