特厚表土层冻结井筒外壁力学特性分析

发布时间：2018-03-01 17:16

本文关键词： 深厚冲积层冻结井筒外壁不均匀荷载模型试验数值模拟　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：在深厚表土层中新建立井井筒,冻结法是有效凿井方法之一。在冻结法凿井过程中,外层井壁的受力变形特性关系到井筒施工安全,为此,进行了特厚表土层冻结井筒外壁力学特性分析研究。论文以淮南某矿回风井为工程背景,通过理论分析,模型试验,数值模拟相结合的方法对冻结井筒外壁在均匀荷载和不均匀荷载作用下的应力变形特性进行了研究。首先,通过理论分析得到了外层井壁在均匀冻结压力作用下和不均匀冻结压力作用下的力学特性;然后,通过相似模型试验,对外层井壁进行了均匀荷载,不均匀荷载系数为1.2和1.5情况下的加载试验,得到了外层井壁的应变和应力值,深入研究了外壁的力学特性,并得到在不均匀荷载系数为1.2情况下外层井壁的极限承载力;最后,通过对外层井壁的数值模拟,得到了外层井壁在均匀荷载和不均匀荷载系数为1.1、1.2、1.5情况下的应力值,获得了外壁的应力分布特性及其极限承载力,并与实验结果进行了对比分析。
[Abstract]:Freezing method is one of the effective methods of shaft sinking in deep topsoil. In the process of freezing shaft sinking, the stress and deformation characteristics of outer shaft wall are related to the safety of shaft construction. In this paper, the mechanical properties of the outer wall of freezing shaft in thick topsoil are analyzed and studied. The paper takes the return air well of Huainan mine as the engineering background, through theoretical analysis, model test, The characteristics of stress and deformation of the outside wall of frozen shaft under uniform and non-uniform loads are studied by means of numerical simulation. The mechanical properties of the outer wall under uniform freezing pressure and uneven freezing pressure are obtained by theoretical analysis. The strain and stress values of the outer shaft wall are obtained by the loading tests with inhomogeneous load coefficients of 1.2 and 1.5. The mechanical properties of the outer shaft wall are deeply studied, and the ultimate bearing capacity of the outer shaft wall is obtained when the non-uniform load coefficient is 1.2. Finally, through the numerical simulation of the outer shaft lining, the stress value of the outer shaft wall under uniform load and non-uniform load coefficient is obtained, and the stress distribution characteristics of the outer shaft wall and its ultimate bearing capacity are obtained. The results are compared with the experimental results.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD265.32

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