南疆盐渍土道路新型路基结构模型试验研究

发布时间：2018-03-19 14:08

本文选题：盐渍土　切入点：新型路基　出处：《塔里木大学》2014年硕士论文　论文类型：学位论文

【摘要】：盐渍土地区的路基在固-液-温多场耦合体系中，必然产生盐分的富集和盐胀现象，导致道路的破坏。本文研究的是一种适合盐渍土道路的新型路基结构，基于固-液-温多场耦合作用理论，进行盐渍土道路路基隔断层、排水层研究，致力于解决南疆盐渍土盐-冻胀、溶陷、翻浆等道路破坏问题，提高盐渍土道路使用寿命和道路服务质量。论文开展路基破坏临界深度现场调查，在典型路段取样进行一些相关实验，包括密度、含水量、固结实验、直剪试验等，为后续试验做好准备工作。在南疆盐渍土道路路床最佳排盐形状模型试验研究中，为了确定路基底部适合排盐的最佳隔断层坡度，按模型与实际路基的长、宽、高相似比1:100设计制造了玻璃模型。试验中通过改变盐渍土路基底部结构中隔断层的坡度,增设排水槽，分析测定排水槽内渗透溶液的含盐量得到该路基结构在相应隔断层坡度时的排盐量，模拟盐渍土路基在降雨时的排盐效果来确定适合排盐的最佳坡度。在南疆盐渍土新型路基盐胀与排盐措施模型试验研究中，，按模型与实际路基及排水沟大小的相似比为1:12设计制造了木质路基模型。综合考虑降雨、高-低温循环条件下，运用相似比原理进行室内模型试验，得到新型路基结构的盐分迁移、盐-冻胀变形和排盐效果，对新型路基的结构性能进行了综合评价。
[Abstract]:In the solid-liquid-temperature coupling system of roadbed in saline soil area, salt enrichment and salt dilatation will inevitably occur, which will lead to the destruction of road. This paper studies a new type of roadbed structure suitable for salinized soil road. Based on the coupling theory of solid, liquid and temperature, this paper studies the fault separation and drainage layer of the roadbed of saline soil, and devotes itself to solving the road damage problems such as salt-frost-heaving, solubilization, slurry and so on. Improve the salinized soil road service life and road service quality. In this paper, the critical depth of roadbed damage is investigated, and some relevant experiments are carried out in typical sections, including density, water content, consolidation test, direct shear test, etc. In order to determine the optimum slope of the seperating fault at the bottom of the subgrade, according to the length and width of the model and the actual roadbed, A glass model was designed and manufactured with a high similarity ratio of 1: 100. By changing the slope of the fault in the base structure of a salinized soil road, an additional drain tank was added. By analyzing and measuring the salt content of the permeable solution in the drainage trough, the salt discharge amount of the subgrade structure is obtained when the slope of the corresponding fault is separated. In order to determine the optimum slope of salt-expelling soil roadbed under rainfall, the model test of salt-expansion and salt-expelling measures for new roadbed of salinized soil in southern Xinjiang was carried out. According to the similarity ratio between the model and the actual subgrade and drainage ditch size, the wood subgrade model was designed and manufactured at 1:12. The indoor model test was carried out by using the similarity ratio principle under the condition of rainfall, high and low temperature cycle. The effects of salt migration, salt-frost heave deformation and salt removal are obtained, and the structural properties of the new subgrade are comprehensively evaluated.
【学位授予单位】：塔里木大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.166

【参考文献】