【摘要】：隨著我國交通事業(yè)的飛速發(fā)展,人們對交通的要求由原來單純的能夠到達目的地逐漸轉變?yōu)橐蠼煌l件快捷、舒適、安全、經濟以及環(huán)保。追求快捷和安全舒適使我國原來修建的雙向四車道高速公路的弊端變得越來越突出。原來修建的雙向四車道高速公路很多面臨改擴建,因此需要急切解決的棘手問題也會慢慢暴露出來。軟土地區(qū)地基的沉降是影響高速公路質量的一項重要因素,對改擴建更是如此。軟土地區(qū)的高速公路地基沉降預測是軟土地區(qū)高速公路建設急需解決的一項技術問題。軟土地區(qū)地基處理技術研究也是目前的一個熱門領域。本文依托京石高速改擴建,進行了如下工作:(1)總結了目前國內軟基沉降預測的一些研究成果。介紹了國內外高速公路改擴建研究現(xiàn)狀。分析京石高速的重要意義,如今改擴建是大勢所趨;(2)分析了軟土的工程特性以及所依托工程的軟土分布以及特性;(3)簡述了目前沉降預測的類型以及各種擬合曲線的機理;(4)采用PLAXIS軟件CFG樁網(wǎng)復合地基進行了數(shù)值模擬,并與實測值做了對比分析;(5)通過現(xiàn)場實測數(shù)據(jù)運用雙曲線法預測中期沉降。采用雙曲線法、皮爾曲線法以及指數(shù)曲線法預測地基后期沉降,然后再與實測值進行對比分析,以期找到預測后期沉降的最優(yōu)方法;(6)對不同的地基處理方式效果進行了對比研究。
[Abstract]:With the rapid development of transportation in our country, people's requirements for traffic have gradually changed from simply being able to reach their destination to requiring fast, comfortable, safe, economic and environmental protection. The pursuit of rapidity and safety and comfort makes the drawbacks of the two-way four-lane highway built in our country become more and more prominent. Many of the original two-way four-lane highways are facing reconstruction and expansion, so the thorny problems that need to be solved urgently will be slowly exposed. The settlement of foundation in soft soil area is an important factor affecting the quality of expressway, especially for reconstruction and expansion. The prediction of highway foundation settlement in soft soil area is an urgent technical problem to be solved in highway construction in soft soil area. The research of foundation treatment technology in soft soil area is also a hot field at present. Based on the reconstruction and expansion of Jingshi high speed, the following work has been done in this paper: (1) some research results of soft foundation settlement prediction in China are summarized. This paper introduces the research status of highway reconstruction and expansion at home and abroad. It is the general trend to analyze the significance of Jingshi high speed. (2) the engineering characteristics of soft soil and the distribution and characteristics of soft soil are analyzed. (3) the types of settlement prediction and the mechanism of various fitting curves are briefly described. (4) the numerical simulation of CFG pile net composite foundation is carried out by using PLAXIS software, and the results are compared with the measured values. (5) the hyperbolic method is used to predict the medium-term settlement through the field measured data. The hyperbolic method, the Peel curve method and the exponential curve method are used to predict the late settlement of the foundation, and then the results are compared with the measured values in order to find the optimal method to predict the late settlement. (6) the effects of different foundation treatment methods are compared and studied.
【學位授予單位】：石家莊鐵道大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U416.1

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