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首页> 外文期刊>Natural hazards and earth system sciences >Surface movement above an underground coal longwall mine after closure
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Surface movement above an underground coal longwall mine after closure

机译：封闭后地下长壁煤矿上方的地面运动

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摘要

The surface movement in an area of about 22aEuro-km(2) above the underground coal mine of Houthalen was analyzed based on Interferometry with Synthetic Aperture Radar (InSAR) measurements. After its closure in 1992, a residual subsidence was observed over a period of several years, followed by an uplift of the surface above and around the past longwall panels, whereby the rate of movement was, in absolute terms, of the same order for the two types of movements. The processes behind these movements are different. The process of subsidence is caused by the caving of the roof above the mined-out area and is mainly a mechanical stress-deformation process, including time-dependent aspects. However, the process of uplift is most probably caused by the swelling of the clay minerals in the argillaceous rocks in the coal strata after the flooding of the underground workings. Hence, the areas in which there is the greatest risk of damage to the surface infrastructure are not the same for the hazards linked to subsidence and uplift. For example, the zone in which the maximum uplift occurs clearly is at a different location from that of the zone with the maximum residual subsidence. There is no clear sign that the amount of mining underneath affects the residual subsidence, and there is no indication that the process of uplift is linked directly to the mining characteristics. It is more likely that uplift as the result of flooding is initiated at, or close to, the vertical shafts.
机译：基于具有合成孔径雷达（InSAR）测量的干涉技术，分析了Houthalen地下煤矿上方约22aEuro-km（2）区域的地表运动。在1992年关闭后，在几年的时间内观察到了残余的沉降，随后隆起了过去的长壁面板之上和周围的表面，因此从绝对值上看，移动速率与面板两种类型的动作。这些运动背后的过程是不同的。沉降过程是由采空区上方的顶板崩落引起的，主要是机械应力变形过程，包括与时间有关的方面。但是，隆起的过程很可能是由于地下工作淹没后煤层中泥质岩中粘土矿物的溶胀引起的。因此，与地面沉降和隆升有关的危害对地面基础设施造成最大损害的风险所在的区域并不相同。例如，明显出现最大隆起的区域与具有最大残余沉降的区域的位置明显不同。没有明显的迹象表明下面的开采量会影响残余沉降，也没有迹象表明隆升过程与开采特征直接相关。洪水造成的隆起更有可能在垂直竖井或垂直竖井附近发生。

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