深厚冲积层冻结法凿井外壁受力变形监测分析  

Monitoring and Analysis on Forced Deformation of Outer Shaft Lining During Freezing Shaft-Sinking in Deep Alluvium

作　　者：姚直书[1] 程桦[1] 江开尧[2] 

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]国投新集能源股份有限公司,安徽淮南232001

出　　处：《煤炭工程》2015年第10期38-41,共4页Coal Engineering

基　　金：国家自然科学基金资助项目(51044004);高等学校博士学科点专项科研基金资助项目(20133415110004)

摘　　要：为了分析杨村煤矿副井冻结法凿井时外壁的安全性,对其进行了受力变形监测工作。通过346m和387m二个水平监测结果分析表明：深厚粘土层冻结压力在混凝土浇筑后7~10d呈快速增长,随后增加趋缓,二个水平冻结压力与埋深（H）的关系分别为0.0107H和0.0109H;外壁环向钢筋应力和混凝土环向应变主要受冻结压力控制,表现为受压。二个水平环向钢筋最大压应力分别为-212.6MPa和-147.5MPa,二个水平混凝土环向应变分别为-1655με和-1170.5με,均小于设计值,外壁处于安全状态;外壁竖向钢筋应力和混凝土竖向应变主要受井壁降温梯度和冻结壁约束程度等影响。在冻结井筒掘进时,确保井帮温度达到一定值,减小冻土位移对外壁的作用,降低温度约束应力,可避免环向裂纹产生,有利于井筒使用过程中防治水工作。In order to analyze the safety of the outer wall of Yangcun Coal Mine auxiliary shaft during freezing shaft sinking,the stress and deformation was monitored. The monitoring results at the levels of 346 m and 387 m showed that,7 - 10 days after concrete pouring,the freezing pressure in deep clay layer increased rapidly,and then slowly. The relations with the freezing pressure monitoring value and depth（ H） of two levels were 0. 0107 H and 0. 0109 H. The outer wall circumferential reinforcement stress and concrete circumferential strain were mainly controlled by the freezing pressure,which is subjected to pressure. Two levels of maximal stress of circumferential reinforcement pressure were- 212. 6MPa and- 147. 5MPa,and concrete circumferential strain were- 1655με and- 1170. 5με,which were all less than design value,so the outer wall was in safe state. The outer wall of the vertical stress and vertical strain of reinforced concrete was mainly affected by the cooling rate and the frozen wall confinement,etc. During shaft sinking,keeping temperature of the shaft lining at the design value and reducing the effect of frozen soil displacement and temperature stress constraints,could reduce the circumferential crack,which was conducive for the water control.

关 键 词：深厚冲积层 冻结法凿井 外层井壁 受力变形 

分 类 号：TD265.3[矿业工程—矿井建设]