极限应变法在圆形隧洞稳定分析中的应用

发布时间：2018-06-06 20:00

本文选题：圆形隧洞 + 破坏准则　；参考：《应用数学和力学》2015年12期

【摘要】：材料的屈服和破坏是不同的,屈服准则已有大量研究,但缺少严格的破坏准则.理想弹塑性模型用应力表述难以区别屈服与破坏,为此该文提出极限应变破坏判据,可用于判断材料的局部和整体破坏.给出了不同材料极限应变的确定方法,并作为破坏判据用于岩土类材料的稳定分析,称为极限应变法.将极限应变法应用于圆形隧洞,研究隧洞的破坏过程、围岩破坏深度及其安全系数,并与滑移线理论和实际模型试验的结果进行对比.研究表明:极限应变法能够判断圆形隧洞的破坏过程与极限状态,求得准确的安全系数,与滑移线场法和模型试验的结果一致,验证了极限应变法在隧洞中应用的可行性.极限应变判据具有明确的力学意义,能反映材料破坏的全过程,为岩土类材料极限分析提供了一种新的方法.
[Abstract]:The yield criterion of materials is different from that of failure, but there is no strict failure criterion. It is difficult to distinguish between yield and failure by the stress expression of ideal elastic-plastic model. In this paper, a limit strain failure criterion is proposed, which can be used to judge the local and global failure of materials. A method for determining the limit strain of different materials is given and used as a failure criterion for the stability analysis of geotechnical materials, which is called the ultimate strain method. The limit strain method is applied to the circular tunnel to study the failure process of the tunnel, the failure depth of surrounding rock and its safety factor. The results are compared with the results of slip line theory and practical model tests. The study shows that the limit strain method can judge the failure process and limit state of circular tunnel and obtain the accurate safety factor, which is consistent with the results of slip line field method and model test, and verifies the feasibility of applying the limit strain method in the tunnel. The ultimate strain criterion is of definite mechanical significance and can reflect the whole process of material failure, which provides a new method for limit analysis of geotechnical materials.
【作者单位】：中国科学院武汉岩土力学研究所;中国人民解放军后勤工程学院军事土木工程系;
【基金】：国家重点基础研究发展计划(973计划)(2011CB013600;2011CB710606) 重庆市自然科学基金(csc2013jcyjys0002)~~
【分类号】：U451

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