【摘要】：隧道圍巖穩(wěn)定性分析是隧道施工中的關鍵技術問題之一。塊體理論在分析圍巖穩(wěn)定性方面較其他分析方法有其獨特的優(yōu)勢,因而在巖體工程中得到廣泛應用。然而,塊體理論存在自身的缺陷,如何更好地將塊體理論與數值分析方法結合對隧道圍巖進行穩(wěn)定性分析和支護設計,已成為地下工程中的熱點研究問題之一。針對上述問題,本文作者依托深圳市葵壩路2號隧道工程,提出了基于塊體理論的隧道圍巖穩(wěn)定性分析及支護方案優(yōu)化這一課題,在已有研究工作的基礎上,進行了系統(tǒng)的研究。(1)詳細總結了隧道圍巖穩(wěn)定性分析的研究方法以及塊體理論的研究現狀,介紹了塊體理論的基本原理。(2)根據隧道工程地質勘察資料結合隧道掌子面描述,選取三組具有代表性的結構面。利用塊體理論結合結構面產狀對深圳市葵壩路工程2號隧道左洞某區(qū)間段圍巖進行分析,找出該區(qū)間段存在的塊體,并對這些塊體進行分析,從而找出其最大區(qū)域內的關鍵塊體,計算其滑動面、滑動力以及安全系數。其中,對曲面塊體的體積以及滑動面的面積采用分割法求解,力求其體積和面積與實際情況相符。(3)利用Unwedge程序計算得出該區(qū)間段塊體的位置、體積以及安全系數,并與塊體理論計算得出的解析解進行對比,證明Unwedge程序能很好的運用塊體理論原理對隧道圍巖穩(wěn)定性進行分析；同時利用Unwedge程序對塊體進行了不同情況下的支護,得到了該程序下最優(yōu)的支護方案,并驗證了設計支護方案的可行性。(4)利用塊體理論計算得出的塊體,采用FLAC3D數值分析方法對隧道開挖及支護優(yōu)化進行了模擬。(5)通過數值分析方法模擬了隧道在有無塊體情況的開挖過程,得到隧道拱頂及拱底在有無塊體時的豎向位移。模擬了塊體在二十四種支護方案下的豎向位移,并與設計支護方案進行了對比分析。本文采用先進的理論計算方法和手段,對隧道圍巖穩(wěn)定性分析及支護參數的優(yōu)化進行了研究,具有較高的工程實用價值,為系統(tǒng)地分析隧道圍巖穩(wěn)定性及最優(yōu)支護方案的選擇提供了一種有效的分析手段。
[Abstract]:The stability analysis of tunnel surrounding rock is one of the key technical problems in tunnel construction. Block theory has a unique advantage over other analysis methods in analyzing the stability of surrounding rock, so it is widely used in rock mass engineering. However, the block theory has its own defects. How to better combine block theory with numerical analysis method to analyze the stability and support design of surrounding rock of tunnel has become one of the hot research problems in underground engineering. In view of the above problems, the author puts forward the problem of stability analysis and support scheme optimization of surrounding rock based on block theory, based on the No. 2 tunnel project of Kwai Ba Road in Shenzhen City. Based on the existing research work, the author puts forward the problem of the stability analysis of the surrounding rock and the optimization of the supporting scheme. The main contents are as follows: (1) the research methods of tunnel surrounding rock stability analysis and the research status of block theory are summarized in detail. The basic principle of block theory is introduced. (2) according to the tunnel engineering geological survey data and the description of tunnel face, three groups of representative structural planes are selected. By using block theory and structural plane occurrence, the surrounding rock of a section of left tunnel of No. 2 tunnel of Shenzhen Kwai Ba Road Project is analyzed, and the blocks existing in the section are found out, and these blocks are analyzed. The key blocks in the maximum area are found, and the sliding surface, sliding force and safety factor are calculated. The volume and area of the surface block and the area of the sliding surface are solved by the partition method. (3) the location, volume and safety factor of the block are calculated by Unwedge program. Compared with the analytical solution calculated by block theory, it is proved that Unwedge program can analyze the stability of surrounding rock of tunnel by using block theory. At the same time, the Unwedge program is used to support the block under different conditions, and the optimal support scheme is obtained, and the feasibility of designing the support scheme is verified. (4) the block is calculated by using block theory. The FLAC3D numerical analysis method is used to simulate the excavation and support optimization of the tunnel. (5) the excavation process of the tunnel with or without blocks is simulated by the numerical analysis method, and the vertical displacement of the tunnel arch roof and arch bottom with or without blocks is obtained. The vertical displacement of block under 24 support schemes is simulated and compared with the designed support scheme. In this paper, the stability analysis of tunnel surrounding rock and the optimization of supporting parameters are studied by using advanced theoretical calculation methods and means, which is of high practical value in engineering. It provides an effective analysis method for the stability of tunnel surrounding rock and the selection of optimal supporting scheme.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U451.2;U455.7

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本文編號：2296539