地下水与应力耦合作用下小保当煤矿回风立井稳定性研究  

Study on stability of return air shaft under the coupling effect of groundwater and stress in Xiaobodang Mine

作　　者：丁彦雄 梁旭 麻银斗 席义苗 张罗迅 Ding Yanxiong;Liang Xu;Ma Yindou;Xi Yimiao;Zhang Luoxun(Shanxi Xiaobaodang Mining Co.,Ltd.,Shenmu 719300,China)

机构地区：[1]陕西小保当矿业有限公司,陕西神木719300

出　　处：《煤炭与化工》2023年第7期9-12,16,共5页Coal and Chemical Industry

摘　　要：在复杂、富水的地质条件下,针对地下水水压与地应力耦合对井筒稳定状态的影响,利用流固耦合数值模拟对地下水渗流作用下井壁变形及壁后围岩塑性区演化特征进行分析。研究结果表明:井筒在砂土段底部及直罗组基岩段底部出现明显应力集中区域,应力集中区域最大应力增加到9.69 MPa左右;井筒砂土段位移量变化不明显,直罗组井壁下沉量趋于稳定,最大位移量趋于11 mm;壁后围岩塑性区发育不明显,仅井筒外壁出现破坏。因此,回风立井井壁应力集中量处于安全范围内,且井壁基本无明显变形,井筒处于稳定状态。Under the complex and water-rich geological conditions,aiming at the influence of the coupling of groundwater pressure and in-situ stress on the shaft stable state,the fluid-solid coupling numerical simulation was used to analyze the deformation of the wellbore and the evolution characteristics of the plastic zone of the surrounding rock behind the wall under the action of groundwater seepage.The results showed that there were obvious stress concentration areas at the bottom of the sand section and the bottom of the bedrock section of the Zhiluo Formation,and the maximum stress in the stress concentration area increased to about 9.69 MPa.The displacement of the sand section of the shaft did not change significantly,and the sinking amount of the shaft wall of the Zhiluo Formation tended to be stable,and the maximum displacement tended to 11 mm;the development of the plastic zone of the surrounding rock behind the wall was not obvious,and only the outer wall of the wellbore was damaged.Therefore,the stress concentration of the return air shaft was within the safe range,and the shaft had no obvious deformation,and the shaft was in a stable state.

关 键 词：井筒失稳 水压 流固耦合 渗流 

分 类 号：TD352[矿业工程—矿井建设]