【作者】 李领先；

【导师】 王齐荣；

【作者基本信息】 西南交通大学 ， 道路与铁道工程， 2007， 硕士

【摘要】 随着青藏铁路的修建及通车，西藏区内特别是那曲地区的经济将会得到快速发展，作为经济发展的基础设施，那曲地区的道路建设也将进入大发展时期。西藏自治区那曲地区内存在着大量的淤泥、沼泽土等软土地基，具有压缩性高、沉降量大、排水固结稳定性差等特点。这些软基给西藏那曲地区的既有道路和拟新建道路带来很多问题，由于西藏自治区内的道路和科学试验与研究、勘察设计、施工、养护维修等技术力量非常薄弱，针对这一现状，本文在广泛查阅国内外有关软基处理技术文献的基础上，结合铁一院青藏铁路地质勘察报告，对西藏那曲地区软土的工程特性与处理技术措施进行了分析研究，取得了如下成果：1．指出了西藏那曲地区软土的形成原因及环境因素的影响；2．通过与内地其他地区软土的对比分析，对其具有冻融性、膨胀性、流变性、触变性进行了探讨；3．阐述了现有较成熟的软基处理技术作用机理及其选择处理技术所考虑的影响因素；4．提出了换填垫层法、堆载预压砂井法和碎石桩法处理西藏那曲地区软土地基；5．通过对吉林宇辉地方铁路塑料排水板法和秦沈客运专线碎石桩法处理效果的分析，得出这两种方案为那曲地区及类似地区处理软弱土地基提供了成功有效的实践经验。更多还原

【Abstract】 With the completion and operation of the Qinghai-Tibet railway, economic of Sitsang .especially Naqu area will rapidly advance. As infrastructure of economic advance, road construction of Naqu area will quickly develop, too. Because there are lots of soft soil , such as mud,bog soil and so on in Naqu area of Sitsang, which takes on many features such as hige compressibility, big settling volume,bad drainage consolidation stability and so on,it take much trouble to existing and newbuilding road construction in Naqu area of Sitsang. Whereas technical force is very weakness in scientific experiment and research, prospective design, construction, conservation and maintenance, this thesis analytically study soft soil engineering property and handling technology by wildly referring to cure on soft soil, especial referring to geologic examination information of Naqu area, which is published by the first design institute of railway department.This thesis study several aspects following:1.Put forward formation cause of soft soil in Naqu area and infection of environmental factor;2. comparing with soft soil of somewhere else, probe into its frost thawing property, swellabitity, rheological property, thixotropy;3. Expatiating mechanism of action of existing handling technology and environmental factors of chosen handling technology;4. Put forward several methods such as change and stuff bed course, gravel pile to handle soft soil foundation in Naqu area;5. By analyzing mechanism of subgrade consolidation with gravel pile of qinshen passenger special line and prefabrication drains in soft soin in Yuhui , applying them to soft soil handling in Naqu area is effective.更多还原