摘要
基于孔隙介质的理论建立了孔隙度、渗透系数及损伤变量和体积应变之间的动态数学模型,给出了M-C准则与D-P准则之间的强度折减系数换算关系。借助有限元程序将该数学模型与有限元强度折减系数相结合,研究了非开挖水平定向钻孔壁稳定性。所给工程案例计算结果表明,采用不同屈服准则得到的安全系数有一定差异,但一定条件下可等价;最后指出考虑动态演化模型所得安全系数比不考虑时小得多,流固耦合效应不容忽视。
Based on the concept of porous media,a dynamic evolution model was established for relationship between porosity,permeability coefficient and damage variable with volumetric strain. Conversion relationship between the strength reduction factors by M-C criterion and D-P criterion is given.Based on ABAQUS platform,the dynamic evolution model combined with the finite element strength reduction coefficient method is used to research the horizontal directional drilling wall stability.Engineering case calculations show that using different yield criteria results in different safety factor,however,under certain conditions,they can be equivalent,the numerical results consistent with the theoretical analysis; The safety factor obtained is much smaller than that without considering the dynamic evolution model. Therefore,in the horizontal directional drilling wall stability analysis,the flowing solid coupling effect can not be ignored.
出处
《地下空间与工程学报》
CSCD
北大核心
2016年第4期890-896,共7页
Chinese Journal of Underground Space and Engineering
基金
自然科学基金(DCCX-CHB-20111121-G)
关键词
水平定向钻
孔壁稳定性
流-固耦合
损伤
强度折减
horizontal directional drilling
hole wall stability
flow-solid coupling
damage
strength reduction
