中文摘要：

考虑岩体中流体的渗流作用,建立套管错断口井壁周围岩体的平衡微分方程。按照损伤程度不同将错断口井壁岩体划分成不同区域（失稳破坏区、损伤区和弹性区）,结合不同区域内岩石材料参数的不同,导出错断口周围岩体各个区域内应力分布规律以及岩体发生失稳破坏和损伤的范围,在此基础上,根据弹塑性力学理论,得出套管错断后不同区域内岩体的变形量,从而为套管错断后井壁稳定性的研究和错断口吐岩块现象的预防提供理论依据。

英文摘要：

By considering fluid’s seepage in rock mass,the balanced differential equation of wall rock is built at casing fracture part.The wall rock of the casing fracture part is divided into different regions according to the different injury degree,which include instability damage zone,injury zone,and elasticity zone.Stress distribution in every region of rock,and rang of instability damage and injury around the fracture part are acquired by different rock material parameters in different regions.On the basis of these,deforming amount of wall rock at casing fracture part is obtained by plasto elasticity theory,all of which could offer theoretical basis for the stability research of the wall and rock spitting prevention.