深季节冻土区涵洞热状况研究及其优化设计

	深季节冻土区涵洞热状况研究及其优化设计
Alternative Title	Research on the Thermal State of Culvert in Deep Seasonally Frozen Region and It's Optimized Design
	汪江红
Subtype	硕士
Thesis Advisor	慕青松
	2014-05-24
Degree Grantor	兰州大学
Place of Conferral	兰州
Degree Name	硕士
Keyword	深季节冻土涵洞温度场模拟计算隔热层材料铺设方案
Abstract	在深季节冻土区，涵洞的设置改善了该地区路基横向排水条件，优化了交通路线，但同时也改变了路基原有的水、热平衡状态，对路基的热稳定性有一定的影响。本论文基于已有的现场监测资料，采用数值模拟的技术手段，围绕涵洞段温度场变化特征和涵底最大冻结深度展开分析研究，对比监测数据和模拟结果，提出了合理的参数选取方案，探讨了涵底基础的热对流效果、地基土含水量和涵洞尺寸与涵底最大冻结深度之间的关系，最后针对涵底最大冻结深度过大的问题，提出了解决方案，并从多个方面对铺设方案进行了优化设计。通过以上研究，为深季节冻土区涵洞工程的设计、建设和维护提供参考。
Other Abstract	The culvert in frozen region could improve transverse drainage condition of this area, and optimize the structure of transportation route. However, it changed the original states of water-heat balance, and had impact on the thermal stability of roadbed. In order to analysis its impact to the roadbed-culvert transition section, based on the existing monitoring data, we established a finite element model to simulate culvert's temperature fields in consideration of latent heat, and judged the reliability through comparing the simulation results to the monitoring data, and then we simulated with different parameters or different sizes to obtain the influence on the maximum frozen depth caused by different intensity of foundation convection under the culvert, different water content of subsoil, different size of culvert. In order to ease the situation, we proposed the measure of laying thermal-protective coating under the culvert, calculated and decided the material of the layer by way of equivalent conversion. Based on the existing monitoring data of culvert in Harbin to Dalian passenger dedicated line, we established a finite element model to simulate the temperature fields of the culvert with thermal-protective coating. We simulated with different parameters or different sizes to obtain the influence on the maximum frozen depth caused by different depth, different modes and different thicknesses, so as to obtain the best measure. The results indicated that: The foam concrete is the ideal material to be used, and we could lay the 19-cm-thick foam concrete on the top of the culvert foundation as thermal-protective coating, which is 10cm broader than the foundation. In this way, the maximum depth under the culvert could be reduced, which could be adapted to the cold region engineering.
URL	查看原文
Language	中文
Document Type	学位论文
Identifier	https://ir.lzu.edu.cn/handle/262010/225979
Collection	土木工程与力学学院
Recommended Citation GB/T 7714	汪江红. 深季节冻土区涵洞热状况研究及其优化设计[D]. 兰州. 兰州大学,2014.

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