不同充填度下岩体剪切-渗流耦合试验研究  

Experimental study of shear-seepage coupling properties of rock mass under different filling degrees

作　　者：许江[1,2] 邬君宇 刘义鑫[1,2] 雷娇 XU Jiang;WUJun-yu;LIU Yi-xin;LIE Jiao(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室,重庆400044

出　　处：《岩土力学》2019年第9期3416-3424,3434,共10页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目（No.51474040,No.51434003）;国家科技重大专项（No.2016ZX05044-02）~~

摘　　要：利用自主研发的煤岩剪切-渗流耦合试验装置,开展不同充填度下含结构面砂岩相似材料剪切-渗流耦合特性试验研究。结果表明:(1)在恒定水压情况下,充填度越大,相似材料的峰值剪应力越小,法向位移越大且发生剪缩现象,一定充填度范围内流量峰值也越大;(2)剪切过程中流量变化主要受充填物中产生的裂隙控制,剪切位移越大,裂隙越发育,流量越大。法向位移对流量变化有一定影响,但随着充填度的增大,影响越来越小;(3)随充填度的增加,充填物的破碎程度逐渐增大。充填度较小时,其主要受到裂隙开度的控制;充填度较大时,主要受法向力影响。由于渗透水的软化作用,结构面的磨损程度逐渐减小。By using the self-developed shear-seepage coupling test device for coal rock, experiments were carried out on similar materials containing structural surface sandstone to obtain shear-seepage coupling properties under different filling degrees. The results show that under constant water pressure, the larger the filling degree is, the smaller the peak shear stress of similar materials is, the larger the normal displacement is and shear shrink phenomenon is observed, and the larger the peak flow rate is within a certain filling degrees range. The flow change during shearing is mainly controlled by the cracks generated in the filling. The larger the shear displacement is, the more the fracture develops, and the greater the flow is. The normal displacement has a certain influence on the flow rate change, but with the increase of the filling degree, the influence becomes smaller. With the increase of filling degree, the fragmentation degree of filling materials gradually increases. The small filling degree is mainly controlled by the crack opening degree, while the large filling degree is mainly affected by the normal force. Due to the softening effect of permeate water, the wear degree of the structural surface slowly decreases.

关 键 词：相似材料 充填度 结构面 剪切-渗流 耦合特征 

分 类 号：TU452[建筑科学—岩土工程]