岩土动力极限应变判据在边坡稳定分析中的应用

发布时间：2019-01-02 19:26

【摘要】：岩土材料受力从弹性进入塑性,最终发展到破坏,材料的屈服与破坏不同,屈服表示材料从弹性进入塑性状态,破坏表示从塑性发展到工程失稳。对于理想弹塑性材料,应力表述的判据难以区分屈服与破坏,为此提出采用极限应变作为岩土材料的破坏判据。给出了岩土材料动力极限应变的求解模型与方法,并以动力极限应变作为破坏准则,它既可以表述动力作用下材料的点破坏或开裂破坏,当点破坏贯通形成破坏面时,还可以表述材料整体破坏。通过地震作用下动力边坡工程算例,得到边坡滑体起裂的位置、演化过程和起裂极限荷载;当边坡中极限应变区贯通时得到边坡整体破坏极限荷载,并与数值极限分析中(超载法、强度折减法)采用位移不收敛破坏准则的计算结果比较,基本一致,验证了极限应变法在动力分析中的可行性。
[Abstract]:The stress of geotechnical material changes from elasticity to plasticity, and finally develops to failure. The yield of the material is different from that of the failure. The yield indicates the material moving from elasticity to plastic state, and the failure indicates the development from plasticity to engineering instability. For ideal elastic-plastic materials, the criterion of stress expression is difficult to distinguish between yield and failure. Therefore, the ultimate strain is proposed as the failure criterion of geotechnical materials. In this paper, the solution model and method of dynamic limit strain of geotechnical materials are given. The dynamic limit strain is taken as the failure criterion. It can not only express the point failure or crack failure of the material under dynamic action, but also can be used when the point failure passes through to form the failure surface. It is also possible to describe the overall destruction of the material. Through the example of dynamic slope engineering under seismic action, the location, evolution process and ultimate load of the slope sliding body are obtained. When the limit strain zone of the slope is through, the whole failure limit load of the slope is obtained, and the calculation results of the numerical limit analysis (overload method, strength reduction method) using the displacement-nonconvergence failure criterion are basically consistent. The feasibility of the limit strain method in dynamic analysis is verified.
【作者单位】：火箭军工程大学士官学院;后勤工程学院军事土木工程系;重庆交通大学土木工程学院;中国人民解放军工程兵学院;
【基金】：国家重点研究发展计划(973)项目(2011CB013600) 国家自然科学基金(51378496;51178457) 重庆自然科学基金(CSTC2013jcyjys0002)
【分类号】：TU43

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