地下深部开采对竖井稳定性影响的数值分析

为研究地下开采对竖井稳定性的影响,以东风铁矿为工程背景,根据地质资料和矿体分布情况建立精细化三维模型,通过室内试验和Hoek-Brown强度准则获得岩体力学参数,并利用FLAC3D数值模拟软件进行计算分析。研究表明,随着矿体的不断开采,竖井的变形值越来越大,且开采对竖井上部的影响较为明显,但变形值均符合安全规范要求。地下开采对竖井和井筒附近岩体的应力场影响较小,竖井无应力集中区,同时竖井塑性区分布范围较小,无塑性贯通区,因此地下开采对竖井稳定性影响较小,竖井可以保持稳定。该研究成果可为矿山后续安全开采提供一定指导。

Numerical analysis of the influence of deep underground mining on shaft stability

In order to study the influence of underground mining on shaft stability, a refine three-dimensional model was established based on the geological data and the distribution of ore bodies in Dongfeng Iron Mine. The mechanical parameters of rock mass were obtained through laboratory tests and Hoek-Brown strength criterion, and the numerical simulation software Flac_^3D was used for calculation and analysis. The results show that with the continuous mining of the ore body, the deformation value of the shaft is getting larger and larger, and the impact of mining on the upper part of the shaft is more obvious, but the deformation value meets the requirements of safety regulations. Underground mining has little influence on the stress field of the vertical shaft and the rock mass nearby the shaft, and the vertical shaft has no stress concentration area. Meanwhile, the distribution range of the plastic zone of the vertical shaft is small, and there is no plastic penetration area. Therefore, underground mining has little influence on the stability of the vertical shaft, and the vertical shaft can remain stable. The research results can provide some guidance for the follow-up safe mining of the mine.