西部季冻区路基土冻胀破坏机理及防治技术研究

发布时间：2018-01-04 01:22

本文关键词：西部季冻区路基土冻胀破坏机理及防治技术研究　出处：《大连海事大学》2014年硕士论文　论文类型：学位论文

【摘要】：我国季节性冻土面积为513.7×104km2,约占全国国土面积的53.5%,季节性冰冻气候对公路工程质量的影响十分显著。伴随着土体中水的冻结和融化,冰冻期路面易产生纵向开裂、冻胀隆起等现象,春融期路面结构则易产生沉陷变形及翻浆等现象,导致路面使用质量降低,影响行车安全,养护维修成本增加。综合冻区、公路自然区划、大地标准冻深、土质、地貌等因素的影响,对季冻区路基冻害进行了系统的调查,并考虑路面结构、路基断面形式、路线走向等因素对道路冻深的影响,对典型冻害进行了钻探调查。通过室内试验完成了路基土冻胀性能、路面材料低温弯曲性能及路基土强度衰减等试验,设计并修筑了路基冻胀特征观测及冻害防治技术实体工程。利用钻探资料、室内试验结果及实体工程观测结果分析了路基土冻胀及冻害机理,提出了路基土冻胀特性评价指标,改进了路基土冻胀测试仪并修订了试验方法,总结了路基土冻胀与道路冻深的影响因素及规律,最终提出路基冻胀防治技术原则与要点,并形成指南。研究成果可用于季冻区公路路基设计、施工及养护,减少路基冻害,降低养护费用,提高路基路面使用性能和服务寿命,符合国家环保节约的基本国策,因此拥有广阔的市场前景和良好的推广应用价值。
[Abstract]:The seasonal frozen soil area in China is 513.7 脳 104km2, which accounts for 53.5% of the national land area. With the freezing and melting of water in the soil, the pavement in frozen period is prone to longitudinal cracking, frost heave and other phenomena. During the spring melting period, the pavement structure is prone to the phenomenon of subsidence, deformation and mudding, which leads to the decrease of pavement quality, the influence of driving safety, the increase of maintenance and maintenance cost, the comprehensive frozen area, the natural division of highway, and the standard freezing depth of the earth. The influence of soil quality, geomorphology and other factors on the frozen depth of road is investigated systematically, and the influence of pavement structure, roadbed cross-section form, route direction and other factors on road freezing depth is considered. Through the laboratory tests, the frost heaving performance of subgrade soil, the low temperature bending performance of pavement material and the strength attenuation of roadbed soil were tested. Based on the drilling data, the results of laboratory test and the observation of solid engineering, the mechanism of frost heave and frost damage of subgrade soil is analyzed. The evaluation index of frost heaving property of roadbed soil is put forward, the testing instrument of frost heaving of subgrade soil is improved and the test method is revised, and the influencing factors and rules of frost heaving of subgrade soil and freezing depth of road are summarized. Finally, the technical principles and main points of roadbed frost heaving prevention are put forward, and the guidelines are formed. The research results can be used in the design, construction and maintenance of highway roadbed in seasonal frozen area, reduce the frost damage of roadbed and reduce the maintenance cost. Improving the performance and service life of subgrade and pavement is in line with the basic national policy of environmental protection and saving, so it has broad market prospect and good value of popularization and application.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.168;U418.5

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