深部巷道围岩的导热性试验与温度场分布的研究.pdfVIP

摘 要 对于深部开采而言，所面临的主要问题是地层高温给开采带来极大的难度，以 及高温对作业环境的影响。基于这一情况，本文开展流固耦合作用下，深部围岩导 热系数的试验研究和巷道温度场分布规律的理论研究。因此本论文分为导热系数测 试、风流与围岩换热的数值模拟两大部分。 对于围岩导热系数的试验研究，本文采用深部岩体作为试样研究了流固耦合条 件下围岩的导热系数，考虑巷道内部的实际情况本文还研究了流固耦合条件下现浇 混凝土的导热系数。研究表明当流体的温度增大时，围岩及现浇混凝土的导热系数 随着流体温度的增大而增大，导热系数与流体的温度近似成线性关系；当流量增大 时，围岩及混凝土的导热系数先是增大，达到一定程度后开始下降最终导热系数始 终大于初始导热系数。 利用流固耦合条件下对围岩及现浇混凝土导热系数的试验研究，获得围岩及现 浇混凝土支护的导热系数，模拟风流与围岩换热条件下深部巷道的温度场分布情 况。模拟表明，组合支护体系下风流的施加不会改变巷道温度场的对称分布形状； 渗流场的施加,改变了温度场和温度矢量原有的对称分布的状态。在巷道的逆渗流方 向等温线密集，而在顺渗流方向等温线分布相对疏松，这表明渗流伴随着热迁移现 象。 关键词：围岩；流固耦合；导热系数；深部巷道；温度场分布 Abstract For the deep mining, the main problem is the difficulty which brought by formation temperature in mining, as well as high temperature operating environment and so on.Based on this situation, this paper carried out under the action of fluid-solid coupling, thermal conductivity of the deep surrounding rock of experimental research and the distribution law of roadway temperature field theory. Therefore, this paper is divided into thermal conductivity testing, airflow and heat transfer numerical simulation of surrounding rock. For the experimental research of the rock thermal conductivity coefficient, this paper deep rock samples were studied as a solid-fluid interaction under the conditions of the thermal conductivity of surrounding rock, considering the actual situation inside the tunnel.Studies have shown that when the fluid temperature increases, the rock, and in-situ thermal conductivity of concrete with the increase of fluid temperature increases, besides, thermal conductivity coefficient and fluid temperature of approximately linear relationship; when the flow rate increa ses, the rock and the concre