Study on Stability Control Technology of Ingate in Thick Alluvium Soft Rock of Deep Mine Shaft

Abstract：Due to the deep mine poor stability of the soft rock roadway in a thick alluvium,serious weathered and weaken when met with water,easy occurred plastic deformation and rheology phenomenon,according to Zhaolou Mine in a high stress area and with the joint and crack developed rock strata,in order to ensure the stability of the ingate in the unstable Alluvium soft rock,a combined support system with high strength yielding bolt＋anchor＋bolt grouting＋shotcreting and site pouring reinforced concrete was provided for the reinforcement of the ingate.After the reinforcement of the ingate conducted,the max stressed value of the bolt and anchor measured would be 56 kN and 108 kN individually and would have a sufficient safety margins.The max strain varied value of the concrete would be 31×10-6,would be in a safety status basically,would remarkably improve the stressed status of the surrounding rock,could improve the bearing capacity of the support structure and could control the deformation of the surrounding rock.Thus the stability control problem of the ingate in thick Alluvium of the deep mine could be effectively solved.The stability of the roadway surrounding rock and the support structure could be ensured.