【摘要】：修建高速公路過程中，常遇見工程地質條件不良的軟土地帶，此地帶具有沉降量大、壓縮性高、排水固結穩(wěn)定性差的特點。軟土地基處理的關鍵是控制處理過程的沉降速率與最終沉降量在設計要求內(nèi)，本文主要研究沉降量的理論計算方法和FLAC3D數(shù)值分析模型擬合實際沉降過程。 首先對軟土的定義、物理特性、分類、軟土地基主要需解決的問題四個方面展開敘述。接下來對公路地基不同處理方法的原理、適用范圍、優(yōu)點及局限性進行了詳細的介紹。通過荊東高速公路實例，對合同段的軟土層分析、處理方案的選擇與優(yōu)化、沉降觀測等進行了詳述；典型斷面的沉降觀測數(shù)據(jù)，為后面沉降預測方法的研究提供數(shù)據(jù)基礎。 在公路軟基處理中，沉降預測是必不可少的，在路堤施工期間，為及時掌握其變形的動態(tài)，動態(tài)觀測與建立軟基沉降動態(tài)預報系統(tǒng)是必不可少。文中先對雙曲線法、泊松曲線、Asaoka法、指數(shù)曲線法和皮爾曲線法等沉降預測方法從理論上進行詳述，然后分別用雙曲線法、三點法、Asaoka法三種方法來理論計算實例的沉降量，再用每種方法的結果與實際最終沉降量進行誤差分析，得出合適的預測方法。 FLAC3D是一款適用于連續(xù)介質力學分析的軟件，該程序處理復雜力學問題的能力強大。通過FLAC3D建模對荊東高速公路軟基超載預壓下的沉降進行分析，以驗證其前預測方法，結果與實際情況擬合很好。最后可以得出結論，F(xiàn)LAC3D數(shù)值計算方法適合于模擬預測超載預壓條件下軟土地基的沉降變形。
[Abstract]:In the process of highway construction, soft soil with poor engineering geological conditions is often encountered, which is characterized by large settlement, high compressibility and poor stability of drainage consolidation. The key of soft soil foundation treatment is to control the settlement rate and final settlement within the design requirements. This paper mainly studies the theoretical calculation method of settlement and the FLAC3D numerical analysis model to fit the actual settlement process. Firstly, the definition, physical properties, classification and main problems of soft soil foundation are described. Then the principle, application range, advantages and limitations of different treatment methods of highway foundation are introduced in detail. Through the example of Jingdong Expressway, the soft soil layer of contract section is analyzed, the selection and optimization of treatment scheme, settlement observation and so on are described in detail, and the settlement observation data of typical section provide the data basis for the research of settlement prediction method in the future. During the construction of embankment, dynamic observation and establishment of dynamic forecasting system of soft foundation settlement are essential in order to grasp the deformation dynamics in time. In this paper, the settlement prediction methods such as hyperbolic method, Poisson curve, Asaoka method, exponential curve method and Pier curve method are described in detail in theory, and then the settlement of an example is calculated theoretically by using hyperbolic method, three-point method and Asaoka method, respectively. Then the error analysis between the results of each method and the actual final settlement is carried out, and the appropriate prediction method is obtained. FLAC3D is a software for continuum mechanics analysis, which has a powerful ability to deal with complex mechanical problems. The settlement of the soft foundation of Jingdong Expressway under overload preloading was analyzed by FLAC3D model to verify the pre-prediction method. The result fits well with the actual situation. Finally, it can be concluded that the FLAC3D numerical method is suitable for simulating the settlement and deformation of soft soil foundation under overload preloading.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U416.16

【參考文獻】

相關期刊論文 前10條

1 宣道光,吳繼民;軟土地基上高速公路橋梁典型病害的處治與加固[J];公路;2004年09期

2 李國維,楊濤,宋江波;公路軟基沉降雙曲線預測法的進一步探討[J];公路交通科技;2003年01期

3 劉萌成,黃曉明;軟土地基上橋臺后填土工后沉降的數(shù)值分析[J];公路交通科技;2004年12期

4 趙明華;劉建華;劉煜;鄭煥然;;濱海公路軟土路基變形機理及其沉降預測研究[J];公路交通科技;2006年01期

5 任國旭,陳新彥;高速公路軟基沉降預測中的誤差分析[J];中外公路;2001年05期

6 張留俊,黃曉明;超軟地基粉噴樁處理問題研究[J];中外公路;2004年05期

7 林清,周成昀,李尚松,饒錫保,龔壁衛(wèi),程展林;排水固結法處理軟土路基路堤穩(wěn)定控制標準探討[J];中外公路;2004年05期

8 林峰,許明軍,藜軍;粉噴樁加固軟土地基現(xiàn)場試驗研究[J];中外公路;2004年05期

9 周慶歡;;基于人工神經(jīng)網(wǎng)絡預測城市道路軟基沉降[J];中外公路;2008年03期

10 韓建強;高速公路軟土地基處理技術的新發(fā)展及研究方向[J];中國港灣建設;2003年05期

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