开切双卸压槽井壁与表土共同作用的力学特性

Mechanic characteristic of reciprocity between shaft liningof double stress relief slot and surface soil

利用ANSYS分析软件对开切双卸压槽井壁与表土共同作用的受力机理进行了分析。通过计算可知,开切单卸压槽后内层井壁竖向应力衰减率为38.6%左右,开切双卸压槽后内层井壁竖向应力衰减率为59.5%左右。由此可见,开切双卸压槽极大地改善了内层井壁的受力状况。内层井壁开切双卸压槽后,当地表再次下沉且下沉量小于卸压槽的允许压缩量时,井筒内、外壁和地层变形协调,内层井壁上的竖向应力以及外壁上的竖向摩擦力均没有急剧变化。

The authors analyse the mechanic characteristic of reciprocity between shaft lining of cutting double stress relief slot and surface soil by using the current structure analysis software ANSYS. The attenuation coefficients of vertical stress of the inside of shaft lining in which cuts stress relief slot are obtained. After cutting stress relief slot, the vertical stress of the inside of shaft lining and the additional stress of the outside of shaft lining are out of sharp change with sedimentation of surface soil.