基于ABAQUS的初始地应力平衡方法研究

Research on Initial Geo-stress Balance Method Based on ABAQUS

初始地应力是岩土工程数值模拟时必需考虑的重要因素,如何在ABAQUS有限元软件中对初始地应力进行平衡是确保数值计算结果正确性的关键。针对ABAQUS提供的4种不同的初始地应力平衡的方法,分别举例验证各种方法进行初始地应力平衡的适用性及其优缺点;分析结果表明:对于简单岩土体,ABAQUS提供的自动平衡法、关键字定义初始地应力法、ODB导入法、初始地应力提取法都可以达到平衡的效果,而对于复杂地质条件的岩土体,只有采用自动平衡法和初始地应力提取法才能获得较好的平衡效果;研究结论可为复杂岩土体数值计算提供了参考。

Initial geo-stress is an important factor in geo-technical engineering numerical simulation and how to balance initial geo-stress in ABAQUS finite element software is the key to ensuring the validity of numerical calculation results.According to four kinds of different initial geo-stress balance methods provided by ABAQUS,this paper separately uses examples to verify the practicability,advantages and disadvantages of each method to conduct initial geo-stress balance and analysis results show that,as for simple geo-technical,the auto-balance method,keywords initial geo-stress definition method,ODB import method and initial geo-stress extraction method provided by ABAQUS can achieve the balance effect,however,with regard to geo-technical of complex geo-conditions,only auto-balance method and initial geo-stress extraction method can obtain better balance effect.The research conclusion can present reference for numerical calculation of complicated geo-technical.