【摘要】：本文結(jié)合察爾汗鹽湖至格爾木高速公路（察格高速公路）和西寧南繞城高速公路的鹽漬土路基修筑工程，采用室內(nèi)試驗、現(xiàn)場試驗與理論分析相結(jié)合的方法，對察爾汗鹽湖地區(qū)強、過氯鹽漬土的溶陷特性進行了研究，并對西寧南繞城高速公路沿線的弱、中鹽漬土進行了砂礫改良和路用性能研究。主要研究成果如下： 1、參考黃土濕陷試驗方法，對強、過氯鹽漬土進行了室內(nèi)單、雙線法試驗，根據(jù)試驗數(shù)據(jù)，定量地分析了鹽漬土浸水溶陷隨壓力變化的規(guī)律，確定了溶陷量、溶陷系數(shù)等參數(shù)；同時根據(jù)鹽漬土的溶陷特征，對壓縮試驗的部分儀器進行了改進，，使其更適用于鹽漬土室內(nèi)溶陷試驗。 2、在察爾汗鹽湖地區(qū)進行鹽漬土現(xiàn)場溶陷試驗，基于《鹽漬土地區(qū)建筑規(guī)范》中“測定溶陷系數(shù)的浸水載荷試驗”的方法，結(jié)合鹽漬土室內(nèi)溶陷試驗，采用單、雙線法進行試驗。通過對試驗數(shù)據(jù)的分析，得出現(xiàn)場鹽漬土地基浸水溶陷及受壓沉降的規(guī)律，并總結(jié)出了該規(guī)律產(chǎn)生的原因。 3、采用向弱、中鹽漬土中摻拌砂礫的方法對其進行改良，以強度（回彈模量和承載比）為控制指標(biāo)，通過調(diào)整砂土配合比，對改良前后土樣的路用性能進行對比分析，同時從級配的角度分析了其對路堤土路用性能的影響，驗證了砂礫改良鹽漬土用作高速公路路堤填料的可行性，并確定出了滿足路堤填料路用性能要求的最優(yōu)砂土配合比。
[Abstract]:This paper combines the construction of saline soil subgrade of Chage Expressway from Chaerhan Salt Lake to Geermu Expressway and Xining Nancheng Expressway, adopts the method of indoor test, field test and theoretical analysis. The dissolution and subsidence characteristics of strong and perchloric saline soils in Chaerhan Salt Lake area were studied, and the improvement of sand gravel and road performance of the weak and middle saline soils along Xining South Roundabout Expressway were studied. The main research results are as follows: 1. Referring to the loess collapsibility test method, the laboratory single and double line test of strong and perchlorinated saline soil is carried out. According to the test data, the law of water solution settlement with pressure change of saline soil is quantitatively analyzed. At the same time, according to the dissolution characteristics of salinized soil, some instruments of compression test are improved. It is more suitable for indoor dissolution test of salinized soil. (2) in the salt lake area of Chaerhan, the in-situ solution test of saline soil is carried out, based on the method of "immersion load test" in the Building Code for saline soil area. Combined with the indoor dissolution test of salinized soil, single and double-wire method was used to carry out the test. Based on the analysis of the test data, the law of solution settlement and compression settlement of salinized soil foundation is obtained, and the causes of this rule are summarized. 3. The method of mixing sand gravel in weak and middle salinized soil is adopted to improve it. Taking the strength (modulus of resilience and bearing ratio) as the control index, through adjusting the mix ratio of sand and soil, the road performance of the soil samples before and after the improvement is compared and analyzed. At the same time, the influence on the road performance of the embankment is analyzed from the point of view of gradation. The feasibility of using sand gravel modified saline soil as filling material for expressway embankment was verified, and the optimum mix ratio of sand and soil was determined to meet the requirement of road performance of embankment filler.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.1;U414.1

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