地下采矿引起地表滑移变形分析

发布时间：2018-01-18 09:48

本文关键词：地下采矿引起地表滑移变形分析　出处：《岩石力学与工程学报》2016年S2期 　论文类型：期刊论文

【摘要】：基于概率积分法对地下采矿引起的岩体变形规律的描述,推导出岩体最大剪切变形和最大拉伸变形的分布曲线,阐述地表出现滑移破坏的原因。结合程潮铁矿地表变形监测成果,进一步说明地下采矿引起的地表滑移变形的条件及特征。最后,采用离散单元法模拟地下开采引起的岩体变形发展过程,阐述地表滑移后岩体的变形趋势。结果表明:在地下开采作用下,岩体中出现的最大剪切变形可使地表发生塌陷,最大拉伸变形可使岩体出现贯通地表的裂缝,在这2个因素共同作用下,地表出现滑移现象。滑移产生后,受影响的地表可分为滑移区和卸荷区,并出现浅部裂缝、深部裂缝和卸荷裂缝,其中,深部裂缝是滑移区和卸荷区的分界线。受地表滑移的影响,在继续开采时,地表在滑移区内的变形程度增大,但地表主要变形范围得到抑制。
[Abstract]:Based on the probabilistic integration method, the distribution curves of maximum shear deformation and maximum tensile deformation of rock mass are derived by describing the law of rock mass deformation caused by underground mining. Combined with the monitoring results of surface deformation of Chengchao Iron Mine, the conditions and characteristics of surface slip deformation caused by underground mining are further explained. The discrete element method is used to simulate the deformation and development process of rock mass caused by underground mining, and the deformation trend of rock mass after surface slip is expounded. The results show that: under the action of underground mining. The maximum shear deformation in the rock mass can make the surface collapse, and the maximum tensile deformation can make the rock mass appear cracks through the surface. Under the combined action of these two factors, the surface slip phenomenon appears. The affected surface can be divided into slip zone and unloading area, and there are shallow fracture, deep fracture and unloading fracture. Among them, deep fracture is the dividing line between slip zone and unloading zone, which is affected by surface slip. When mining continues, the deformation degree of the surface increases in the slip zone, but the main deformation range of the surface is restrained.
【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;
【分类号】：TD325
【正文快照】： 地下矿山开采会引起地表不同程度的变形,特别是地下金属矿山崩落法开采,地表变形呈现出不同的形态:不仅有连续的变形,还有不连续的变形;不仅有地表塌陷变形,还有岩体滑移变形[1-2]。目前,国内外学者对各种采矿引起的地表塌陷机制、塌陷类型的研究较为充分[3-4],如柱状下塞、溶

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