盐湖区高速公路盐渍化软土地基沉降规律研究
发布时间：2018-09-04 17:05
【摘要】：本文依托青海省察尔汗～格尔木高速公路，该项目部分路段穿过不良地质段察尔汗盐湖。根据盐湖区的水文地质条件和实际工程需要，在科研试验路段设计了盐渍化软基的原位试验方案，通过对地表沉降、土应力、地基土含水率等变化进行为期一年的监测，得到了许多珍贵的现场监测数据，以该数据为基础，从理论分析结合现场试验等方面入手，对盐湖区的软土地基沉降特性以及沉降计算方法等内容进行了研究，并分析了盐湖区软弱盐渍土地基在两种地基处理条件下（强夯置换法与砾石桩处理法）的沉降变化规律，结果表明两种处治方法均取得了较好的效果，，沉降曲线的变化趋势大体上一致，适合在盐湖区使用。利用曲线拟合法预测了地基土的最终沉降量，基于实测数据，对两种拟合方法进行了计算与对比，得到了适合该地区地基土沉降特征的预测方法，最后讨论了桩土应力与土体含水率的变化分别对地基沉降的影响，其结果可为盐湖区其他类似工程提供参考。
[Abstract]:Based on Qarhan-Golmud Expressway in Qinghai Province, some sections of the project pass through Qarhan Salt Lake. According to the hydrogeological conditions and practical engineering requirements of the salt lake area, the in-situ test scheme of salinized soft foundation was designed in the experimental section of scientific research. The changes of surface subsidence, soil stress and soil moisture content were monitored for one year. A lot of precious monitoring data are obtained. Based on the data, the settlement characteristics and settlement calculation methods of soft soil foundation in Yanchu Lake region are studied from the aspects of theoretical analysis and field test. The variation of settlement of soft saline soil foundation in the salt lake area under two kinds of ground treatment conditions (dynamic tamping replacement method and gravel pile treatment method) is analyzed. The results show that the two treatment methods have achieved better results. The variation trend of settlement curve is basically consistent, and it is suitable for use in the salt lake area. The final settlement of foundation soil is predicted by curve fitting method. Based on the measured data, two fitting methods are calculated and compared, and a prediction method suitable for the settlement characteristics of foundation soil in this area is obtained. Finally, the effects of pile stress and soil moisture content on foundation settlement are discussed respectively, and the results can be used as reference for other similar projects in the Salt Lake area.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
本文编号：2222805
[Abstract]:Based on Qarhan-Golmud Expressway in Qinghai Province, some sections of the project pass through Qarhan Salt Lake. According to the hydrogeological conditions and practical engineering requirements of the salt lake area, the in-situ test scheme of salinized soft foundation was designed in the experimental section of scientific research. The changes of surface subsidence, soil stress and soil moisture content were monitored for one year. A lot of precious monitoring data are obtained. Based on the data, the settlement characteristics and settlement calculation methods of soft soil foundation in Yanchu Lake region are studied from the aspects of theoretical analysis and field test. The variation of settlement of soft saline soil foundation in the salt lake area under two kinds of ground treatment conditions (dynamic tamping replacement method and gravel pile treatment method) is analyzed. The results show that the two treatment methods have achieved better results. The variation trend of settlement curve is basically consistent, and it is suitable for use in the salt lake area. The final settlement of foundation soil is predicted by curve fitting method. Based on the measured data, two fitting methods are calculated and compared, and a prediction method suitable for the settlement characteristics of foundation soil in this area is obtained. Finally, the effects of pile stress and soil moisture content on foundation settlement are discussed respectively, and the results can be used as reference for other similar projects in the Salt Lake area.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
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