临—哈高速河套盐渍土区风积沙换填路基工艺研究

发布时间：2019-07-04 08:06

【摘要】：临—哈高速公路是国家完成西部大开发项目中的一项重要工程,位于内蒙古临河至新疆哈密。其中,内蒙古河套段K50～K67处,土壤为灌区盐渍土。河套灌区土壤次生盐渍化的形成主要是由于当地农业从黄河引水灌溉,灌排比例失调,抬高了地下水位,使地下水中的盐分在干旱气候强烈蒸发作用下而移至地表。导致当地盐渍化较为严重。路基作为公路整体结构最重要的一部分,在盐渍土膨胀等因素影响下,会加剧路基的翻浆与冻胀等病害,对公路的稳定性造成破坏。因此,对于盐渍土地区公路建设,合理确定盐渍土地基的处理方式以及盐渍土区的路基填料选择与施工工艺有着重要的实际意义。具体研究内容如下:(1)分析盐渍土的基本性质、力学性质等特性,结合项目的地质等情况,使用风积沙换填盐渍土地基;(2)通过风积沙的颗粒分析和相关力学性质试验,研究风积沙的路用性能;(3)研究盐渍土地基处理的方式及风积沙路基填筑的施工工艺及技术参数;
[Abstract]:Linha Expressway is an important project in the western development project, which is located in Linhe, Inner Mongolia and Hami, Xinjiang. Among them, at K50~K67 in Hetao section of Inner Mongolia, the soil is saline soil in irrigation area. The formation of soil secondary salinization in Hetao irrigation area is mainly due to the imbalance of irrigation and drainage ratio of local agriculture from the Yellow River, which raises the groundwater level and makes the salt in groundwater move to the surface under the action of strong evaporation in arid climate. Resulting in local salinization is more serious. Subgrade, as the most important part of highway structure, under the influence of saline soil expansion and other factors, will aggravate subgrade grouting and frost heave and other diseases, causing damage to the stability of highway. Therefore, it is of great practical significance for highway construction in saline land area to reasonably determine the treatment method of saline soil foundation and the selection of subgrade filling and construction technology in saline soil area. The specific research contents are as follows: (1) analyze the basic properties and mechanical properties of saline soil, combined with the geological conditions of the project, use aeolian sand to replace saline soil foundation; (2) study the road performance of aeolian sand through particle analysis and related mechanical properties test of aeolian sand; (3) study the way of saline soil foundation treatment and the construction technology and technical parameters of aeolian sand subgrade filling; (2) study the road performance of aeolian sand by particle analysis and related mechanical properties test; (3) study the way of saline soil foundation treatment and the construction technology and technical parameters of aeolian sand subgrade filling;
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1

【参考文献】