论文部分内容阅读
基土换填是常用的抗冻胀措施。目前非冻胀性土缺乏科学标准的定义,换填厚度基本按照经验公式和工程类比确定,不尽科学合理。在对垫层抗冻胀机制的分析基础之上,根据层状土毛管水土水势理论给出了垫层材料的选择依据,结合热阻等效原理在考虑了衬砌结构允许位移的基础上给出了渠道垫层厚度的计算公式,并根据传统算法与该方法对山东打渔张北干渠弧形坡脚梯形渠道进行抗冻胀垫层设计;同时采用ANSYS有限元软件对渠道铺设垫层前后进行热力耦合数值模拟。研究表明,垫层通过改善水分场、温度场削弱了冻胀发生的因素;该垫层算法比传统算法合理、工程造价较低。数值分析表明,渠道冻胀量、冻胀力明显被削减,其中对阴坡的削减可达90%以上。
Soil replacement is commonly used frost heaving measures. At present, the non-frost-heaved soil lacks the definition of scientific standards, and the thickness of the replacement fill is determined according to empirical formula and engineering analogy, which is not scientific and reasonable. Based on the analysis of the mechanism of frost heaving resistance of cushion, the selection basis of cushion material is given according to the theory of soil-water potential of layered soil capillary. Based on the equivalent principle of thermal resistance, the allowable displacement of lining structure is given According to the traditional algorithm and the method, the design of anti-frost heave cushion was designed for the trapezoidal channel of arc-shaped slope in Zhangbei trunk canal of Shandong fishing. At the same time, ANSYS finite element software Thermal Coupling Numerical Simulation. The research shows that the cushion layer weakens the frost heaving by improving the water field and the temperature field. The cushion layer algorithm is more reasonable than the traditional algorithm and the project cost is lower. Numerical analysis shows that the amount of frost heaving channel and frost heaving are obviously reduced, of which the shading reduction can reach more than 90%.