季冻地区过湿土改良研究

发布时间：2018-11-11 21:27

【摘要】：吉林至荒岗高速公路区属季冻性过湿土地区,雨季较长,降雨量相对集中,地表积水难以快速排泄,以致地下水位偏高,土体常常处于高含水量状态,土质松软,孔隙比大,承载力低,加之冻融循环作用导致土体结构破坏,土体稳定性较差。因此,要确保公路建设的顺利进行,保障所建公路的安全性和稳定性,必须针对季冻性过湿土地区路基填料进行处治。通过查阅相关资料,在总结和分析国内外有关季冻性过湿土地区路基处治技术研究现状和理论成果的基础上,主要研究了以下内容:(1)通过室内基本物理力学试验,得出了季冻地区过湿土的基本物理力学性质指标。根据季冻地区过湿土的含水率、液塑限等指标对其进行了界定,提出了适用于季冻地区过湿土的处治技术方案。(2)根据季冻地区过湿土的处治技术方案研究,得出了以水泥作为主要掺加剂,改良季冻地区过湿土的试验方案。开展了针对水泥改良土的工程性质系统的研究,得到了水泥改良土的击实特性、无侧限抗压强度、CBR承载比、回弹模量、水稳定性、冻融稳定性等路用性能指标。(3)根据季冻地区过湿土的处治技术方案,对比分析季冻地区过湿土、水泥改良土和水泥改良季冻地区过湿土的力学强度试验数据和稳定性试验数据,分析得出改良后土的工程性质变化规律,总结水泥对季冻地区过湿土改良效果,为吉林至荒岗高速公路区公路建设提供坚实的数据支撑和理论基础。
[Abstract]:The highway area from Jilin to Huanggang is a seasonal frozen and overwet soil area. The rainy season is long, the rainfall is relatively concentrated, the surface water is difficult to drain quickly, so the groundwater level is high, the soil is often in a high water content state, the soil is soft, and the porosity ratio is large. Low bearing capacity, combined with freezing and thawing cycle, lead to soil structure failure, soil stability is poor. Therefore, in order to ensure the smooth progress of highway construction and ensure the safety and stability of the built highway, it is necessary to deal with the subgrade filler in the seasonal freezing wet soil area. On the basis of reviewing relevant data and summarizing and analyzing the present situation and theoretical achievements of subgrade treatment technology at home and abroad, this paper mainly studies the following contents: (1) through indoor basic physical and mechanical tests, the main contents of this paper are as follows: (1) through indoor physical and mechanical tests, The basic physical and mechanical properties of overwet soil in seasonal frozen area are obtained. According to the index of moisture content and liquid plastic limit of overwetted soil in seasonally frozen area, the technical scheme for treatment of overwet soil in seasonally frozen area is put forward. (2) according to the technical scheme of treatment of overwetted soil in seasonally frozen area, the treatment scheme of overwet soil in seasonally frozen area is studied. The test scheme of improving the wet soil in the area of seasonal freezing with cement as the main admixture was obtained. Based on the systematic study of the engineering properties of the cement modified soil, the compaction characteristics of the cement modified soil, the unconfined compressive strength, the bearing ratio of CBR, the modulus of resilience and the water stability are obtained. Freeze-thaw stability and other road performance indexes. (3) according to the treatment technical plan of overwet soil in seasonal frozen area, comparative analysis is made on overwet soil in seasonal frozen area. The mechanical strength test data and stability test data of cement modified soil and cement modified soil in season frozen area are analyzed. The change rule of engineering properties of improved soil is obtained, and the improvement effect of cement on overwet soil in season frozen area is summarized. It provides solid data support and theoretical basis for highway construction in Jilin-wasteland expressway area.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU43

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