【摘要】：本文依托青海省察爾汗～格爾木高速公路，該項(xiàng)目部分路段穿過不良地質(zhì)段察爾汗鹽湖。根據(jù)鹽湖區(qū)的水文地質(zhì)條件和實(shí)際工程需要，在科研試驗(yàn)路段設(shè)計(jì)了鹽漬化軟基的原位試驗(yàn)方案，通過對地表沉降、土應(yīng)力、地基土含水率等變化進(jìn)行為期一年的監(jiān)測，得到了許多珍貴的現(xiàn)場監(jiān)測數(shù)據(jù)，以該數(shù)據(jù)為基礎(chǔ)，從理論分析結(jié)合現(xiàn)場試驗(yàn)等方面入手，對鹽湖區(qū)的軟土地基沉降特性以及沉降計(jì)算方法等內(nèi)容進(jìn)行了研究，并分析了鹽湖區(qū)軟弱鹽漬土地基在兩種地基處理?xiàng)l件下（強(qiáng)夯置換法與礫石樁處理法）的沉降變化規(guī)律，結(jié)果表明兩種處治方法均取得了較好的效果，，沉降曲線的變化趨勢大體上一致，適合在鹽湖區(qū)使用。利用曲線擬合法預(yù)測了地基土的最終沉降量，基于實(shí)測數(shù)據(jù)，對兩種擬合方法進(jìn)行了計(jì)算與對比，得到了適合該地區(qū)地基土沉降特征的預(yù)測方法，最后討論了樁土應(yīng)力與土體含水率的變化分別對地基沉降的影響，其結(jié)果可為鹽湖區(qū)其他類似工程提供參考。
[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.
【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

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