本文選題：巖溶 + 地鐵　； 參考：《中南大學》2014年碩士論文

【摘要】：摘要：隨著我國人口增長和城鎮(zhèn)化速度的加快,交通問題日益突出,地鐵建設在全國各大城市先后展開。作為巖溶發(fā)育的主要物質基礎,碳酸鹽巖石在我國分布廣泛,巖溶地質的存在成為地鐵建設中不可忽略的一個問題。尋求一種計算地基承載力有效方法,對地鐵安全施工和正常使用都有一定的指導意義。 本文依托于國家(青年)自然科學基金資助項目“地鐵隧道巖溶地基穩(wěn)定性極限分析方法研究”(項目編號：51108462),主要的研究內容如下： (1)論述了極限分析方法尤其是求解下限解的一般原理,并對巖溶地基的提出簡化模型,按鉸接桁架法對其承載力進行了計算。 (2)闡述了下限有限元法的基本原理,并用MATLAB程序語言進行了編程,以MATLAB工具箱實現(xiàn)有限元法的線性規(guī)劃求解。為驗證此程序的適用性,先將其應用于條形基礎地基承載力,將得到的結果與精確解進行比較。然后將其應用于地鐵隧道巖溶地基承載力的計算,得出結論。 (3)采用ANSYS計算軟件,選取合適的屈服準則,通過增量加載法,對地鐵隧道巖溶地基承載力進行了研究。 (4)對隧洞底部存在單個溶洞的情況,利用上述兩種方法探究地基承載力下限解與溶洞直徑、頂板厚度等因素之間的關系規(guī)律。 (5)對隧洞底部存在串珠型溶洞的情況進行分析,結論表明自上而下第一個溶洞對極限承載力下限解起決定性作用。 (6)結合廣州軌道交通工程沿線的巖溶地質報告,對存在多土層地質條件下的隧洞地基承載力進行了計算。
[Abstract]:Abstract: with the acceleration of population growth and urbanization in China, traffic problems become increasingly prominent. Subway construction has been carried out in all major cities in China. As the main material basis of karst development, carbonate rocks are widely distributed in China. The existence of karst geology has become a problem that can not be ignored in subway construction. To find an effective method to calculate the bearing capacity of foundation has certain guiding significance for the safe construction and normal use of subway. This paper is based on the National (Youth) Natural Science Foundation funded project "study on the limit Analysis method of the Karst Foundation Stability of Metro Tunnel" (Project No.: 51108462C). The main contents of the research are as follows: In this paper, the general principle of limit analysis method, especially the solution of lower limit, is discussed, and the simplified model of karst foundation is put forward, and the bearing capacity of karst foundation is calculated by hinge truss method. (2) the basic principle of the lower bound finite element method is expounded, and the linear programming solution of the finite element method is realized by MATLAB toolbox with MATLAB programming language. In order to verify the applicability of the program, it is first applied to the bearing capacity of strip foundation, and the obtained results are compared with the exact solution. Then it is applied to the calculation of the bearing capacity of underground tunnel karst foundation, and the conclusion is drawn. 3) the bearing capacity of karst foundation of subway tunnel is studied by means of incremental loading method and suitable yield criterion is selected by using ANSYS calculation software. 4) in the case of a single cave at the bottom of the tunnel, the relationship between the lower limit solution of the foundation bearing capacity and the factors such as the diameter of the cave and the thickness of the roof is studied by using the above two methods. The analysis of the existence of beaded caverns at the bottom of the tunnel shows that the first cave from top to bottom plays a decisive role in the solution of the lower limit of ultimate bearing capacity. Based on the karst geological report along Guangzhou rail transit project, the bearing capacity of tunnel foundation under multi-soil geological conditions is calculated.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U452.11

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