基于热-结构耦合的含水疏松砂岩隧洞冻结施工数值分析

发布时间：2018-01-26 13:42

  本文关键词： 隧道工程 含水疏松砂岩 冻结帷幕 热-结构耦合分析 安全系数　出处：《西北农林科技大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：【目的】针对含水疏松砂岩冻结法施工问题,对冻结帷幕进行应力应变分析,为同类岩土的施工和设计提供依据,也为冻结法施工多场耦合数值模拟奠定基础。【方法】以甘肃引洮一期工程7#隧洞为例,在综合考虑隧洞掘进对温度场、位移场和应力场影响的基础上,依托热学理论及有限元分析软件ANSYS,对隧洞进行热-结构耦合三维数值模拟分析。【结果】通过对隧洞进行热-结构耦合三维数值模拟分析,得到隧洞冻结与开挖过程中冻结帷幕厚度为3.3m,温度场平均温度为-13.3℃,冻土帷幕最大沉降量为2.46mm,满足设计要求;同时通过对最危险断面的应力与应力强度进行对比,得到Y方向应力和切应力安全系数分别为5.57和7.95,大于规范中供设计时的最大参考值2.0。【结论】对于含水疏松砂岩冻结法施工,温度和结构具有相关性,热-结构耦合分析相比结构分析和热应力分析精确度更高。
[Abstract]:[objective] to analyze the stress and strain of freezing curtain in order to provide basis for the construction and design of similar rock and soil. It also lays a foundation for the numerical simulation of multi-field coupling in freezing construction. [methods] taking the first phase of Gansu Tao diversion Project as an example, the influence of tunnel excavation on temperature field, displacement field and stress field is considered comprehensively. Based on the thermal theory and finite element analysis software ANSYS, the thermal-structural coupling three-dimensional numerical simulation of the tunnel is carried out. [results] through the tunnel thermal-structural coupling three-dimensional numerical simulation analysis. The thickness of freezing curtain is 3.3 m, the average temperature of temperature field is -13.3 鈩，

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