季冻区路基土冻胀特性及评价指标体系研究
发布时间：2018-10-15 12:17
【摘要】：季节性冻胀一直是困扰我国北方地区公路建设的一个重要难题,然而,国内对于冻土研究资料主要集中在多年冻土方面,对季节性冻土的研究还有待进一步深入,并且随着我国高等级公路里程的不断攀升,早期修建的公路也相继进入养护期,其检测、养护工作被提升到前所未有的重要地位。 为了进一步研究季冻区路基土冻胀特性,并对其冻胀状况进行评价,在黑龙江省季冻区范围内选取了三条不同等级道路,对道路实际冻胀状况进行了现场调查及观测。同时,采集了路基填土进行闭式冻胀模拟试验,对试验结果进行了单因素及多因素回归分析；基于试验结果,应用SPSS统计分析软件建立了多因素冻胀率预测模型,并应用区间估计理论对季冻区黏土和中砂土进行了冻胀性分类；根据调查结果及相关规范标准建立了季冻区路基冻胀状况等级评价指标体系,并进行了实例应用。结果表明：含水率对冻胀率影响最大,压实度次之,冻结温度最小；粉质黏土起始冻胀含水率为0.88倍塑限,临界冻胀含水率为0.97倍塑限,低液限黏土起始冻胀含水率为0.91倍塑限,临界冻胀含水率为0.97倍塑限,中砂土起始冻胀含水率为0.72倍塑限,临界冻胀含水率为0.84倍塑限；对黏土和中砂土路基冻胀性进行了分类,解决了规范中黏土冻胀性评价偏于不安全的问题；中砂土冻胀性分类可以用于评价碎(卵)石、粗砂、粉黏粒含量大于15%的中砂及粉黏粒含量大于10%的细砂类土的冻胀性；综合考虑路基冻胀影响因素建立的季冻区路基冻胀状况等级评价指标体系,适用于季冻区不同等级道路路基冻胀状况等级评价。研究成果对于季冻区路基冻害防治及冻胀状况等级评价等具有一定意义。
[Abstract]:Seasonal frost heaving has always been an important problem for highway construction in northern China. However, the domestic research data on frozen soil mainly focus on permafrost, and the research on seasonal frozen soil needs to be further studied. With the increasing mileage of high grade highway in our country, the early built highway has entered the maintenance period one after another, and its inspection and maintenance work has been promoted to an unprecedented important position. In order to further study the frost heave characteristics of subgrade soil in seasonal frozen region and evaluate its frost heave condition, three different grade roads were selected in the seasonal frozen region of Heilongjiang Province, and the actual frost heave condition of the road was investigated and observed. At the same time, the closed frost heave simulation test of embankment fill is carried out, and the single factor and multiple factor regression analysis are carried out on the test results. Based on the test results, the multifactor frost heave rate prediction model is established by using the SPSS statistical analysis software. The frost heaving classification of clay and medium sand in seasonal frozen zone is carried out by using interval estimation theory, and the evaluation index system of frost heave status of subgrade in seasonal frozen area is established according to the investigation results and relevant standard, and an example is given. The results show that moisture content has the greatest influence on frost heaving rate, compaction degree is second, freezing temperature is the smallest, initial frost heave moisture content of silty clay is 0.88 times plastic limit, critical frost heave moisture content is 0.97 times plastic limit, The initial frost heave water content of low liquid limit clay is 0.91 times plastic limit, the critical frost heave water content is 0.97 times plastic limit, the initial frost heave moisture content of medium sand is 0.72 times plastic limit, and the critical frost heave moisture content is 0.84 times plastic limit. The frost heaving property of clay and medium sand subgrade is classified to solve the problem that the evaluation of clay frost heaving is not safe in the code, and the classification of frost heave property of medium sand can be used to evaluate broken (egg) stone, coarse sand, The frost heaving property of medium sand with silty clay content more than 15% and fine sand soil with silt clay content more than 10%, the evaluation index system of frost heaving grade of subgrade in seasonal frozen area is established by synthetically considering the influence factors of roadbed frost heaving. It is suitable for the evaluation of frost heaving condition of roadbed in different grade road in seasonal freezing area. The research results have a certain significance for the prevention and treatment of subgrade frost damage and the evaluation of frost heave status in seasonal frozen area.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.16
本文编号：2272530
[Abstract]:Seasonal frost heaving has always been an important problem for highway construction in northern China. However, the domestic research data on frozen soil mainly focus on permafrost, and the research on seasonal frozen soil needs to be further studied. With the increasing mileage of high grade highway in our country, the early built highway has entered the maintenance period one after another, and its inspection and maintenance work has been promoted to an unprecedented important position. In order to further study the frost heave characteristics of subgrade soil in seasonal frozen region and evaluate its frost heave condition, three different grade roads were selected in the seasonal frozen region of Heilongjiang Province, and the actual frost heave condition of the road was investigated and observed. At the same time, the closed frost heave simulation test of embankment fill is carried out, and the single factor and multiple factor regression analysis are carried out on the test results. Based on the test results, the multifactor frost heave rate prediction model is established by using the SPSS statistical analysis software. The frost heaving classification of clay and medium sand in seasonal frozen zone is carried out by using interval estimation theory, and the evaluation index system of frost heave status of subgrade in seasonal frozen area is established according to the investigation results and relevant standard, and an example is given. The results show that moisture content has the greatest influence on frost heaving rate, compaction degree is second, freezing temperature is the smallest, initial frost heave moisture content of silty clay is 0.88 times plastic limit, critical frost heave moisture content is 0.97 times plastic limit, The initial frost heave water content of low liquid limit clay is 0.91 times plastic limit, the critical frost heave water content is 0.97 times plastic limit, the initial frost heave moisture content of medium sand is 0.72 times plastic limit, and the critical frost heave moisture content is 0.84 times plastic limit. The frost heaving property of clay and medium sand subgrade is classified to solve the problem that the evaluation of clay frost heaving is not safe in the code, and the classification of frost heave property of medium sand can be used to evaluate broken (egg) stone, coarse sand, The frost heaving property of medium sand with silty clay content more than 15% and fine sand soil with silt clay content more than 10%, the evaluation index system of frost heaving grade of subgrade in seasonal frozen area is established by synthetically considering the influence factors of roadbed frost heaving. It is suitable for the evaluation of frost heaving condition of roadbed in different grade road in seasonal freezing area. The research results have a certain significance for the prevention and treatment of subgrade frost damage and the evaluation of frost heave status in seasonal frozen area.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.16
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