岩土力学 ›› 2019, Vol. 40 ›› Issue (1): 165-172.doi: 10.16285/j.rsm.2017.0960

• 基础理论与实验研究 • 上一篇    下一篇

层状盐岩双井流场浓度场试验及数值计算

姜德义1，李晓康1，陈 结1, 2，李晓军1，刘 伟1，康燕飞1   

  1. 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
  • 收稿日期:2017-05-12 出版日期:2019-01-11 发布日期:2019-01-30
  • 作者简介:姜德义，男，1962年生，博士，教授，主要从事矿山岩石力学、岩土工程及盐穴能源储备方面的研究。
  • 基金资助:
    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)。

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

JIANG De-yi1, LI Xiao-kang1, CHEN Jie1, 2, LI Xiao-jun1, LIU Wei1, KANG Yan-fei1   

  1. 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2017-05-12 Online:2019-01-11 Published:2019-01-30
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51574048, 41672292, 51604044, 5183000292) and the Fundamental Research Founds for the Central Universities (106112016CDJZR245518).

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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。

关键词: 层状盐岩, 双井造腔, 流场, 运移规律, 浓度场

Abstract: 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.

Key words: layered salt rock, double well cavity, flow field, migration law, concentration field

中图分类号: 

  • TU 452
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