基于MSPS系统和FLAC3D软件的地下开采地表沉陷预测分析

地下开采可能诱发地面建(构)筑物变形及地表环境破坏,造成巨大损失。为研究地下开采后能否消除对地表建(构)筑物的安全影响,以拟采用充填采矿法开采的某金矿为工程背景,依据地下开采地表沉陷理论,运用MSPS和FLAC_^3D相结合的方法,对充填开采后地表沉陷进行预测分析与对比印证,确定矿区充填开采后地面沉陷范围与大小。预测分析结果表明：该矿采用充填法开采,并采取合理的安全对策后,由地下开采所诱发的地面沉陷变量均未超过地面保护对象的地表允许变形值,满足建(构)筑物保护等级的要求；MSPS系统预测的地表最大下沉值偏大,而FLAC_^3D软件预测的地表最大下沉值较小,可能与数值模拟岩体力学参数取值有关,两种方法预测的地表最大下沉值都在允许变形范围内。分析结果对该矿安全设施设计以及类似矿山地表稳定性分析具有参考价值。

Prediction and Analysis of Mining Surface Subsidence Induced by Underground Mining based on MSPS and FLAC3DZHANG Shengli1, HOU Jinping2, SU Qisong3, XIE Lianku4, MIAO Yonggang4

Underground mining may induce deformation of ground buildings (structures) and damage to surface environment, resulting in huge losses. In order to study whether the safety impact on surface buildings (structures) can be eliminated after underground mining, taking a gold mine to be mined by filling mining method as the engineering background, according to the surface subsidence theory of underground mining, the surface subsidence after filling mining is predicted, analyzed, compared and verified by using the method of MSPs and FLAC_^3D, and the range and size of surface subsidence after filling mining in the mining area are determined. The prediction and analysis results show that after the mine is mined by filling method and reasonable safety countermeasures are taken, the ground subsidence variables induced by underground mining do not exceed the allowable surface deformation value of the ground protection object, which meets the requirements of the protection level of buildings (structures); The maximum surface subsidence predicted by MSPs system is too large, while the maximum surface subsidence predicted by FLAC_^3D software is small, which may be related to the value of mechanical parameters of numerical simulation rock mass. The maximum surface subsidence predicted by the two methods is within the allowable deformation range. The analysis results have reference value for the design of safety facilities in the mine and the analysis of surface stability of similar mines.