地表新增荷载对采空区上方覆岩的影响规律

The laws of overlying strata influenced by newly increased load on the surface above worked-out area

通过相似材料模拟实验,研究了全部开采和部分开采条件下的采空区在地表新增荷载后,地表附加沉降和采空区上覆岩层内应力的变化规律.研究表明,地表加载点与采空区的相对位置不同时加载后地表附加沉降量具有明显差异,越靠近采空区,中央沉降量越大,实测到的开采前上覆岩层内应力基本上随深度增加线性增大,开采后上覆岩层内应力发生重分布,加载后的附加应力分布随深度增加逐渐减小.

Based on the experiment with similar material, the laws of the extra subsidence on the surface and the stress vary inside overlying strata by newly increased load on the surface above worked-out area formed by fully mined and partial mined were researched. The study shows that the extra subsidence of the surface after the newly increased load on the surface exist remarkable difference when the loading point is not simultaneous with relative location of worked-out area. The extra subsidence on the surface is increasingly large when the location draws near the worked-out area central. The reality measures stress inside overlying strata is linearity enhancing following the depth to increase before the coal mining. The stress inside overlying strata re-distributes after the coal worked-out, and the additional stress inside overlying strata distribution diminishes gradually following the depth to increase after the newly increased load on the surface.