【作者】 姜浩亮；

【导师】 汪仁和；

【作者基本信息】 安徽理工大学 ， 岩土工程， 2007， 硕士

【摘要】 本文在现有的冻结法凿井,井壁、冻结壁设计理论的基础上,结合冻土的物理力学特性和混凝土水化热性质,分析冻结法施工井壁混凝土的基本组成成分、放热性能及水化热的产生机理和理论计算方法。对井壁施工过程中温度、应力监测分析,得出井壁和冻结壁温度场分布变化规律,冻胀压力变化规律和井壁钢筋混凝土的受力规律。通过物理力学性能室内试验,得出冻土比热、导热系数以及基本冻土力学参数。结合混凝土水化热情况下冻结壁井壁温度场数值计算模型的建立方法,运用有限元软件ADINA建立数值模型,进行冻结壁温度场计算,得出冻结壁温度场分布特性。模拟并比较某矿在原型状态,不同井壁厚度,不同井帮温度,不同通风条件四种状态下的冻结壁和井壁的温度场,得出井壁最高温度、最大温差、回冻时间、冻结壁融化范围等参数。导入温度场计算结果,对井壁冻结壁相互作用进行温度场应力场耦合计算,得出外井壁温度应力分布、冻结壁应力分布、工作面底鼓、井帮位移等关键结果。通过对实测结果和数值模拟进行对比分析,得出冻结壁对井壁的作用规律。通过本课题的研究可以初步了解冻结壁形成过程和冻结法施工过程中两壁的温度场分布和冻结壁回冻对井壁的作用规律,对改进冻结施工方法、井壁设计具有一定的参考意义。更多还原

【Abstract】 On the base of lining and frozen wall designing theories, and the physical and mechanical properties of frozen soil, hydration heat of concrete ,analyses the components characteristic ,mechanism of hydration heat production and calculation method on shaft sinking by freezing.Through the monitoring of temperature and stress in shaft lining and frozen wall, obtain the varying of temperature field stress field and frost heave on lining and frozen wall,Through the physical and mechanical testing, obtain the heat capacity, coefficient of heat conductivity ,and other basic mechanical property.Combine the numeric calculation medal of concrete hydration heat,using ADINA finite element program ,numerically simulates the temperature field of frozen wall and shaft lining. Numerically simulates the temperature interaction of frozen wall and shaft lining in four different conditions, obtain the maximum temperature, temperature difference, refrozen time, thawing limits of frozen wall. base on the result, simulates the stress interaction of frozen wall and shaft lining.Through carries the contrast analysis to the actual result and the numerical simulation, finally obtains the interaction laws between hydration heat lining and frozen wall. Through this topic, the frost heave of frozen soil act on the frozen wall in the frozen solid forming was studied. This topic has considerable reference value in Shaft Sinking by Freezing and structural design of shaft lining.更多还原