程潮铁矿东区地面塌陷机制及扩展机制初探

发布时间：2018-02-27 16:52

本文关键词： 地下采矿金属矿山三维激光扫描技术塌陷机制扩展机制悬臂梁板模型　出处：《岩土力学》2017年08期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:According to the history and present situation of subsidence in the eastern part of Chenghu Lake, the 3D surface model of ground collapse is reconstructed by means of 3D laser scanning technology, and the contour map of land subsidence and the basin of cumulative subsidence value are drawn with surfer. The collapse points are mostly distributed in marbles and surrounding rock alteration zones. The collapse areas are striped from east to west, and the collapse in the north is more serious than that in the south. The collapse areas are characterized by glacial landforms such as "corner peaks" and "edge ridges", etc. According to the geological conditions, the collapse areas are characterized by glacial landforms such as "angle peaks" and "edge ridges". The mining situation and monitoring data analysis show that underground mining is the inducement and geological condition is the internal cause. The combined action of the two causes the collapse pit first in the area of marble and surrounding rock alteration zone, and after the occurrence of the collapse pit, Higher horizontal tectonic stresses are released, The rock mass which is cut from NE joint to cantilever beam plate is broken. The range of rock mass fracture is 172 m wide through the analysis of the established mechanical model. The toppling slip failure occurs along the fracture surface of the broken rock mass, which is a force of this kind of force. The mechanism of learning expansion makes the scope of the crater expand. Finally, a large collapsing basin was formed.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;中国地质大学(北京)工程技术学院;
【基金】：国家自然科学基金面上项目(No.11472293);国家自然科学基金青年基金项目(No.11602284)~~
【分类号】：P642.26;TD327

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