基于3DMine-Rhino-FLAC3D的多采空区对竖井的稳定性影响分析

矿山不断的深入开采,会遗留下大量采空区,采空区的失稳破坏势必会对位于移动带内的竖井稳定性造成影响,竖井的变形破坏不仅影响矿山正常生产,还将给人们的生命,财产和国家造成重大损失。随着高性能计算机和数值模拟技术的普及,为复杂采空区及竖井的稳定性研究提供了新的解决思路。为了解内蒙古某金矿竖井的稳定情况,在“三维网格堆砌法”的基础上提出了3DMine-Rhino-FLAC_^3D耦合建模的新思路,能够更加精准的反应地表、矿体和采空区的实际情况,提高计算的准确性。对竖井周围的应力、位移、塑性区等方面进行了分析,并提出两种可行的治理措施。1.发现该竖井在658m中段的变形量最大,最大位移量3.5cm左右;2.随着采深的不断加大,虽然在采空区周围的围岩应力有增大的趋势,但在开采过程中对竖井周围应力影响较小;3.通过开挖后主竖井周围围岩仍处于原岩应力状态,未出现剪切和拉伸破坏;4.对两种不同的治理方案治理后的采空区分析发现主竖井的变形速率明显减小,说明两种治理方案均能使井筒变形的到控制,有效提高竖井周围围岩的稳定性。

Analysis of the influence of multiple goafs on shaft stability based on 3DMine-Rhino-FLAC3D

With the continuous deep mining, a large number of goaf will be left behind. The instability of goaf will inevitably affect the stability of the shaft located in the moving zone. The deformation and damage of the shaft will not only affect the normal production of the mine, but also cause great losses to people"s lives, property and the country. With the popularization of high performance computer and numerical simulation technology, it provides a new solution for the stability research of complex goaf and shaft. In order to understand the stability of a gold mine shaft in Inner Mongolia, a new idea of 3DMine-Rhino-FLAC_^3D coupling modeling is proposed based on the "three-dimensional grid stacking method", which can more accurately reflect the actual situation of the surface, ore body and goaf, and improve the accuracy of calculation. The stress, displacement and plastic zone around the shaft are analyzed, and two feasible treatment measures are put forward. 1. It is found that the deformation of the shaft in the middle section of 658m is the largest, with the maximum displacement of about 3.5cm; 2. With the increasing of mining depth, although the surrounding rock stress around the goaf has an increasing trend, it has little influence on the stress around the shaft during the mining process; 3. The surrounding rock around the main shaft is still in the original rock stress state after excavation, and there is no shear and tensile failure; 4.It is found that the deformation rate of the main shaft is significantly reduced after the treatment of goaf, which shows that the two treatment schemes can control the deformation of shaft and effectively improve the stability of surrounding rock around the shaft.