三维初始地应力场的多尺度弹塑性校正  

Multi-scale elasto-plastic calibration of the regression analysis of 3D initial crustal stress field

作　　者：杨强[1] 刘福深[1] 任继承[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水力发电学报》2007年第6期24-29,共6页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(50579026)及973课题(2002cb412708)

摘　　要：本文运用弹塑性增量计算中转移应力的概念,对三维初始地应力场多元线性回归分析结果进行弹塑性校正。测点地应力的实际测量值与多元回归值之间的差值就是测点处应进行弹塑性校正的转移应力值;本文采用基于D-P准则的增量分析方法,计算出应力状态不满足塑性屈服条件的各点转移应力,然后进行弹塑性迭代计算,完成对回归结果的弹塑性校正。实际工程的计算表明,校正后的初始地应力场能合理反映出地形、地质、构造和岩石力学性质的影响,回归地应力场能够满足屈服条件,该方法回归精度高,简单实用。In this paper, the elasto-plastic modification of multiple regression analysis of 3D initial crustal stresses for multi-scale finite element models is presented based on the concept of the stress to be transferred in elasto-plastic incremental method. At any test point, the difference of stress between the measured value and the regression value of crustal stresses must be transferred in elasto-plastic scheme ; at those points where stress state doesn＇t satisfy the yield condition, the transferred stress can be computed by the incremental method based on D-P yield criteria, and then the elasto-plastic iterative computation is made and the elasto-plastic modification of the regression results is achieved. The computation of practical engineering project shows that the modified initial crustal stress field can reflect the effect of the topography, geology, construction and mechanical properties of the rock and can satisfy the yield condition. This method is highly accurate and can be used easily.

关 键 词：岩土力学 地应力场 弹塑性校正 多元回归分析 

分 类 号：TU452[建筑科学—岩土工程]