冻结条件下井筒支护结构稳定性研究  

On Wellbore Support Structure Stability Under Freezing Condition

作　　者：张勇 彭文庆 邹师同 朱豪 汪琦 ZHANG Yong;PENG Wenqing;ZOU Shitong;ZHU Hao;WANG Qi(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201

出　　处：《矿业工程研究》2024年第1期6-15,共10页Mineral Engineering Research

基　　金：国家自然科学基金资助项目(51974118)。

摘　　要：内蒙古自治区的查干淖尔煤矿一号井的主斜井上段采用冻结法施工时,围岩遇到解冻水后形成高膨胀性围岩压力,导致直墙半圆拱形支护结构变形和严重破坏.为解决原支护方案支护力不足的问题,采用FLAC 3D对原支护方案建模,分析原支护方案的变形机理,基于此提出似马蹄形断面的双层井壁支护方案,并对新方案井筒的极限承载力进行计算,对比分析原方案与新方案的顶底板位移量、两帮移近量以及应力值.结果表明:似马蹄形断面的双层井壁支护形式能达到抵抗高膨胀性围岩压力和抑制底鼓的效果.When the upper section of the main inclined shaft of No.1 well in Chagannaoer Coal Mine in Inner Mongolia Autonomous Region is constructed by freezing method,the surrounding rock forms high expansive surrounding rock pressure after encountering thaw water,which leads to the deformation and serious damage of the straight wall semi-circular arch support structure.In order to solve the problem of insufficient support force in the original support scheme,FLAC 3D is used to model the original support scheme,and the deformation mechanism of the original support scheme is analyzed.Based on this,a double-layer shaft wall support scheme with horseshoe-shaped section is proposed,and the ultimate bearing capacity of the new scheme is calculated.The displacement of the roof and floor,the displacement of the two sides and the stress value of the original scheme and the new scheme are compared and analyzed.Results show that the double-layer shaft lining support form of horseshoe-like section can achieve the effect of resisting high expansive surrounding rock pressure and inhibiting bottom heave.

关 键 词：井筒支护 断面形式 数值分析 

分 类 号：TD352[矿业工程—矿井建设]