冻融温度场作用下既有井壁受力变形规律研究

摘要

根据宁东地区麦垛山煤矿既有井壁条件下井筒施工面临的问题,通过数值模拟的方法,研究了麦垛山副井侏罗系地层冻融过程中冻结壁冻胀力以及既有井壁受力变形的规律,得到了冻结与强制解冻交互作用下,井壁不同特征点径向应力应变和切向应力应变分布规律,结果表明采用强制解冻可以有效控制井壁周围冻土的位移,减小井壁周围土体所施加的压力,从而释放冻胀压力,达到有效保护井壁的目的。%According to the problems of the mine shaft construction under the existed mine shaft liner condition in Maiduoshan Mine of Ningdong Area,the numerical simulation method was applied to the study on the frozen swelling force of the freezing wall and the stressed deformation law of the mine shaft liner during the freeze thawing process of the Jurassic formation in the mine auxiliary shaft of Maiduoshan Mine in Ningdong Area.The radial stress and strain distribution and the circulated stress and strain distribution law at the different feature point of the mine shaft liner were obtained under the cross function of the freezing and forced thawing.The results showed that the forced thawing could effectively control the displacement of the freezing soil around the mine shaft liner and could reduce the pressure on the soil around the mine shaft liner.Therefore the frozen swelling pressure could be released and the target to effectively protect the mine shaft liner could be obtained.