软岩巷道掘进突水过程红外时空演化特征研究

Study on infrared time-space evolution features of water inrush process in mine soft rock roadway heading

为了获取软岩巷道掘进工作面突水过程的红外时空演化特征,为实际工程巷道开挖过程中突水事故以及隧道渗漏水的时空预测与遥感监测提供理论基础,研究了粉砂岩双轴加载突水过程的红外辐射特征,从时、空要素综合预测识别突水信息。试验结果表明:1根据突水量的大小,将粉砂岩突水演化过程划分为"渗水→滴水→淋水→涌水"4个阶段;2粉砂岩突水不同阶段红外辐射温度曲线特征各不相同,其中升温速率加快可作为突水量增大的前兆,最低辐射温度出现骤升骤降预示突水的发生;3加载过程中,高温异常区即为渗水的发生位置,也是最终突水位置。渗水前10 s左右,对应渗水部位会出现高温异常,渗水发生后,高温异常转低温异常,且随着水量增大,降温幅度越大。利用红外热像仪,从时空综合预测角度研究突水的识别和监测预报,在一定程度上可以减少实际工程中突水事故带来的损失。

In order to get the infrared time-space evolution features of the water inrush process of soft rock roadway heading face and to provide certain theoretical base to the time-space prediction and remote sensing monitoring and measuring on water inrush accident during the excavation process of the mine actual engineering roadway and the water leakage of the tunnel,the paper had a study on the infrared radiation features of the siltstone during the water inrush process of the biaxial loading and the water inrush information were comprehensively predicted and identified from the time-space factors. The test results showed that ① based on the size of the water inrush,the water inrush evolution process of the siltstone was divided in to seepage → dripping water → water spray → water inrush four steps; ② the infrared radiation temperature curve features of the siltstone water inrush was individually different at each different stage,the temperature rising rapidly would be a precursor of the water inrush volume increased and a sudden rising or a sudden dropping of a min radiation temperature would be a predicted water inrush occurred; ③ during the loading process,a high temperature abnormal zone would be the location of the seepage occurred and would be the final water inrush location. Before about 10 s of the seepage occurred,the related seepage location would have an abnormal high temperature. After the seepage occurred,the abnormal high temperature would be changed to an abnormal low temperature and with the water volume increased,the temperature reduction would be highly reduced. An infrared thermal imager was applied to study the water inrush identification and the monitoring and measuring prediction from a view of the time-space comprehensive prediction. On a certain degree,the loss by the water inrush accident could be reduced in the actual engineering project.