卸载状态下冻结壁外载的统一解

发布时间：2018-06-02 23:59

本文选题：冻结壁 + 统一强度理论　；参考：《现代隧道技术》2017年05期

【摘要】：文章基于统一强度理论,考虑中间主应力的影响,采用卸载状态下冻结壁-周围土体共同作用的冻结壁力学模型,推导得到冻结壁弹性区和塑性区的应力场、位移场,并分别建立了冻结壁弹性极限外载、塑性极限外载、弹塑性外载的统一解,分析了冻结壁的应力场、位移场随半径、强度理论参数的变化规律,讨论了半径比、强度理论参数及冻结壁计算深度对各个统一解的影响。结果表明,半径和强度理论参数对冻结壁的应力场、位移场均有一定程度的影响,考虑中间主应力的影响可得到更精确的计算结果;冻结壁的弹性极限外载、塑性极限外载均随半径比和强度理论参数的增大而增大;弹塑性状态下冻结壁的外载随冻结深度的增大而减小,随强度理论参数的增大而增大;冻结壁的外载比原始水平应力低,是由卸载状态下冻结壁与周围土体共同作用决定的。该结果可为冻结壁的设计及工程应用提供一定的参考。
[Abstract]:Based on the unified strength theory and considering the effect of intermediate principal stress, the stress field and displacement field of the elastic zone and plastic zone of frozen wall are derived by using the mechanical model of freezing wall under unloading condition. The unified solutions of elastic limit external load, plastic limit external load and elastoplastic external load of frozen wall are established respectively. The variation law of stress field, displacement field with radius and strength theoretical parameters of frozen wall are analyzed, and the radius ratio is discussed. The influence of theoretical parameters of strength and calculation depth of freezing wall on each unified solution. The results show that the radius and strength theory parameters have some influence on the stress field and displacement field of the frozen wall to some extent, considering the influence of the intermediate principal stress, the calculation results can be obtained more accurately, and the elastic limit external load of the frozen wall can be obtained. The plastic limit load increases with the increase of radius ratio and strength theoretical parameters, and decreases with the increase of freezing depth and increases with the increase of strength theoretical parameters in elastic-plastic state. The external load of the frozen wall is lower than that of the original horizontal stress, which is determined by the interaction between the freezing wall and the surrounding soil under unloading condition. The results can provide some reference for the design and engineering application of freezing wall.
【作者单位】：长安大学建筑工程学院;长安大学地质工程与测绘学院;
【基金】：国家自然科学基金项目(41202191) 中国博士后科学基金项目(2014M562358) 陕西省自然科学基础研究计划项目(2015JM4146) 中央高校基本科研业务费专项资金项目(310828173402) 长安大学优秀博士学位论文培育资助项目(310828150018)
【分类号】：TB12

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