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根据程湖东区塌陷历史与现状,借助三维激光扫描技术重建了地面塌陷三维地表模型,结合surfer绘制出了地面累计沉降等值线图和累计沉降值盆地;最初塌陷点大多分布在大理岩及围岩蚀变带中;塌陷区自东向西呈条带状分布,北部塌陷要比南部严重;塌陷区内呈现类似“角峰”、“刃脊”等冰川地貌的特点。根据地质条件、采矿情况以及监测资料分析,认为地下采矿是诱因,地质条件是内因,二者共同作用导致了塌坑大多首先在大理岩及围岩蚀变带区域中出现。在塌坑出现后,较高的水平构造应力得到释放,使得由NE向节理切割成悬臂梁板的岩体被折断。通过建立的力学模型分析得到岩体折断的范围达到了172 m宽。折断的岩体沿着折断面发生倾倒滑移破坏。这种力学扩展机制使得塌坑范围不断扩大,最终形成一个大的塌陷盆地。
According to the history and current situation of subsidence in Cheng Hudong area, the three-dimensional surface model of ground subsidence was reconstructed by 3D laser scanning technology, and the cumulative ground settlement contour map and cumulative subsidence value basins were obtained in combination with surfer. Most of the initial subsidence points were located in the marble and the surrounding area Rock subsidence zone; the subsidence area is stripe distribution from east to west, and the collapse in the north is more serious than in the south; and the glacier topography similar to the “peak”, “ridge” and other glaciers are present in the subsidence area. According to geological conditions, mining conditions and monitoring data analysis, it is considered that underground mining is the inducement and geological conditions are internal factors. The joint action of the two causes the collapse pit mostly first appeared in the area of marble and wall rock alteration. After the collapse pit appears, the higher horizontal tectonic stress is released, so that the rock mass cut from the NE to the cantilever is broken. According to the established mechanical model, the fracture range of the rock mass reached 172 m wide. Broken rock along the fracture surface dumping slip damage. This mechanism of mechanical expansion makes the collapse of the scope of the pit continued to expand, eventually forming a large collapse basin.