矿井巷道掘进过程中含水构造附近岩体温度场的模型试验研究

An experiment of temperature field of rock mass near water-bearing structure during roadway excavation

分析含水构造附近渗流作用影响下的热扩散理论,采用典型的流-固耦合相似材料配比和相似模拟试验架,完善光栅温度、渗透压力监测系统。对含水构造附近的巷道掘进进行试验模拟,对掘进过程中围岩变形和渗流边界条件改变引起的渗流场、温度场的变化规律进行分析。研究结果表明:含水构造附近的岩体具有明显的低温异常特征;掘进过程中,水体附近渗透压力显著降低,岩体的热对流作用随巷道开挖逐步加强,岩体温度逐步降低,但水体的温度影响范围变化较小;通过Peclet数的对比分析,为探测矿井突水提供了一种新途径;对巷道掘进中的岩体温度场进行数据拟合,得出温度法预报的经验公式,为岩体温度法探水提供了可靠的试验依据。

The process of thermal diffusion in rock masses influenced by excavation around the water-bearing structure was investigated. Similarity material for typical H-M （hydro-mechanical） coupling experiments was perfected and the monitoring system of fiber brag grating （FBG） temperature sensors and FBG seepage pressure sensors were improved and used in this experiment. The roadway excavation around the water-bearing structure was simulated. The variation of the seepage field and temperature field caused by the rock deformation and change of seepage boundary conditions were analyzed. The rock mass adjacent to the water-bearing structure has low-temperature comparing with the far-field rock mass. During the excavation, the seepage pressure around the water-bearing structure decreases and the thermal convection increases. As a result, the temperature of rock mass reduces gradually with small changes in the scope affected by the water with the excavation. A new method for the forecast of water inrush is proposed by analyzing the Peclet value The temperature fitting curve of rock mass is concluded in the end. It provides the theoretical foundation for the forecasting water with rock mass temperature.