层状盐岩双井流场浓度场试验及数值计算  

Model test and numerical calculation of double-well flow field in layered salt rock

作　　者：姜德义 李晓康[1] 陈结[1,2] 李晓军[1] 刘伟[1] 康燕飞[1] JIANG De-yi;LI Xiao-kang;CHEN Jie;LI Xiao-jun;LIU Wei;KANG Yan-fei(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,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]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《岩土力学》2019年第1期165-172,182,共9页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51574048;No.41672292;No.51604044;No.5183000292);中央高校基本科研业务费专项资金资助(No.106112016CDJZR245518)~~

摘　　要：为了研究层状盐岩小间距双井水溶造腔中流场浓度场特征,进行了相关的模型试验和数值计算。基于量纲分析法搭建了模拟建腔期腔内流场的相似模型试验平台,利用染色法研究了建腔期腔内流场运移规律,并采用时均法测量腔内浓度。试验发现:流量越大,浮羽流极限高度越高,但腔内浓度变化速率减小,排卤口浓度变低;提管高度的改变实际上是改变了淡水相对于腔体的初始空间位置;夹层赋存状态变化实际是改变夹层在溶腔中的空间位置,处于不同区域的夹层会改变腔体流场的运动趋势和作用范围。利用Fluent软件进行3D数值计算,结果验证了室内试验流场的普遍规律,得出同样的分层结果;但在速度分布上,发现流场底部并非无宏观流动,而是自然对流扩散和沉降作用占主导。Experimental model tests and numerical modelling were carried out to reveal characteristics of the concentration field of flow field in a double-well water-soluble cavity with the small spacing in the layered salt rock. Based on a dimensional analysis method, a similar model experiment platform was established to simulate the flow field in the cavity during its construction. The flow field migration law of the cavity and the intra-cavern concentration were measured by the dyeing method and a time averaging method respectively. It is found that the higher the flow rate was, the higher the limit height of the plume was. However, the change rate of concentration in the cavern decreased and the concentration of the outlet declined. The variation of the height of casing pipe actually changes the initial space position of freshwater relative to the cavity. The change of the interlayer occurrence state can be seen as changing the spatial position of the interlayer in the cavity, and interlayer in different regions change the movement trend and the range of action of the cavity flow field. 3D numerical calculation was conducted by using the Fluent software. The same stratified results were obtained as them from experiments in the laboratory, which verified the general rule of flow field from tests. However, in terms of velocity distribution, it was found that the flow field at the bottom was not macro-flow, which was dominated by natural convection, diffusion and sedimentation.

关 键 词：层状盐岩 双井造腔 流场 运移规律 浓度场 

分 类 号：TU452[建筑科学—岩土工程]