摘要
针对目前特厚表土层深钻井工程井壁底常用设计计算方法不能反映结构的细部应力特征、且支承环应力与实际状态不符的难题,采用有限元法对淮南张集煤矿西区进风井井壁底结构进行了数值分析,计算结果表明,原设计井壁底结构中壳体与支承环相交处内缘径向应力最大,为-34.54 MPa.在井壁底结构设计时,可取支承环高度2.0 m进行计算.通过设计优化,井壁底结构中最大应力得到大大降低,只有-12.68 MPa,满足了设计强度要求.工程实测结果表明,优化后井壁底结构中实际钢筋的最大应力为-67.20 MPa,混凝土最大应变为-351με,且都远小于他们的设计值.优化后的井壁底不但节约了混凝土浇灌量,更为重要的是中间部位没有浇灌实,为后面破锅底爆破工作创造了自由面,加快了施工进度.
Now the method of design and calculation of drilling engineering shaft lining bottom in super-deep alluvium can not indicate detail stress characteristic and supporting ring＇ s stress does not accord with actual estate. Aiming at this problem, adopted finite element method to analyze the structure of intake air shaft lining bottom of Zhangji Mine west area, the result indicates that the inner margin radial stress of shaft lining bottom structure be- tween supporting ring and shell in the original design is maximum, which is -34.54 MPa. Selected the supporting ring height as 2.0 m in the design of shaft lining bottom. After the design optimized, the maximum stress of shaft lining bottom reduced greatly, which is only - 12.68 MPa and satisfies design strength request. The engineering measurement of shaft lining bottom indicates that the maximum stress of steel bar in the shaft lining bottom is -67.20 MPa and the maximum strain of concrete is -351με, which are far less than their designed value. This shows that the structure of optimized shaft lining bottom is not only costs less of concrete but also greatly accelerates construction progress because the middle part do not poured dense and this creates a free surface for shaft lining bottom blasting.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2009年第6期747-751,共5页
Journal of China Coal Society
基金
安徽省自然科学基金资助项目(050440502)
安徽高校省级自然科学研究计划重点资助项目(KJ2008A039)
关键词
特厚表土层
钻井法凿井
井壁底
有限元法
super-deep alluvium
shaft drilling
shaft lining bottom
finite element method
