高围压下石英砂的渗透特性试验研究  

Experimental Study of the Permeability Characteristics of Quartz Sand under High Confining Pressure

作　　者：李伟[1] 杨川 曹子明 张晓铭[1] LI Wei;YANG Chuan;CAO Ziming;ZHANG Xiaoming(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110179)

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110179

出　　处：《土工基础》2024年第6期1068-1073,共6页Soil Engineering and Foundation

基　　金：国家自然科学基金(51308355);辽宁省自然科学基金(20170540735)。

摘　　要：为解决水利工程、深部矿井中处于高围压高渗透压下砂土的渗透问题,利用高压三轴仪对石英砂进行了高围压高渗透压下的渗透试验,探讨了高围压高渗透压下石英砂的渗透特性,研究了同一渗透压下,不同围压对渗透系数的影响;同一围压下,不同渗透压对渗透系数的影响。结果表明,在同一渗透压下,渗透系数随围压的增大而减小且减小的幅度越来越小;在同一围压下,渗透系数随渗透压的增大而减小且减小的幅度越来越小。分析了试样试验前后的颗粒级配变化,发现试样在试验过程中发生了颗粒破碎,试样中粒径<0.1 mm的细颗粒增多,使得石英砂的渗透系数减小。In the study of the sand permeability characteristics,most of them are based on normal pressure conditions,while the penetration characteristics of the sand under the high pressure is less.In the water conservancy engineering,the sand in deep mines is often under high pressure conditions,in order to study the permeability of the deep quartz sand,this paper uses the high pressure triaxial shear test equipment to perform permeability tests under the high confining pressures and high osmotic pressures.The permeability characteristics with different confining pressures under the same osmotic pressure and with different osmotic pressures under the same confining pressures are tested.The results show that under the same osmotic pressure,the coefficient permeability decreases with the increase of the confining pressure and the reduction rate is smaller and smaller.Under the same confining pressure,the coefficient of permeability is reduced,and the magnitude reduction is less and less.Further,this paper also analyzes the grain size variation before and after the tests.It is observed that the particle breakage is occurred during the test,and the fine particles of the particle size of<0.1 mm in the sample are increased,so that the coefficient permeability of the quartz sand is reduced.

关 键 词：渗透系数 高围压 石英砂 高渗透压 

分 类 号：TU411[建筑科学—岩土工程]