【摘要】：近年來,隨著經濟的發(fā)展,交通基礎設施建設逐步加快。特別是西部大開發(fā)戰(zhàn)略的實施和四縱四橫高鐵的建設,隧道建設被推向了新的高峰。隧道在未來幾年內將不斷增多。圍巖穩(wěn)定是隧道安全施工的基本條件,如何維持隧道圍巖穩(wěn)定是隧道工程最基本的問題之一,因此國內外學者應用各種研究方法對圍巖穩(wěn)定性開展了大量研究工作,并取得了豐碩成果。 本文以津秦客運專線葫蘆山隧道工程為背景,分析了三臺階法、兩臺階法、全斷面法三種不同施工方法對圍巖穩(wěn)定性的影響。論文的主要內容和結論包括： 首先選取變形較大的斷面作為典型斷面,分析造成變形的原因。得出結論：三種施工方法的圍巖變形均經歷了開挖前超前位移釋放階段,急劇變形階段、緩慢變形階段和變形穩(wěn)定等四個階段。其中急劇變形階段變形量大,最易發(fā)生失穩(wěn)破壞。 其次對一般性斷面(即具有完整監(jiān)測數據的全部斷面)變形穩(wěn)定時的凈空收斂值、拱頂沉降值以及急劇變形階段的持續(xù)時間三個量進行統(tǒng)計分析,采用正態(tài)分布擬合的方法,論證了三臺階法、兩臺階法和全斷面法的適用性。并且得出,絕大多數的監(jiān)測斷面都會在1個月后完成急劇變形,進入緩慢變形階段。因此開挖一個月后是施做二襯的最佳時機。 第三分別對三臺階法、兩臺階法和全斷面法三種施工方法下圍巖的變形規(guī)律進行數值模擬研究,并將研究結果與實測數據進行對比分析,得出：圍巖的變形規(guī)律主要為拱頂向下沉降,遂底向上隆起,圍巖兩側向中間收斂。隧道開挖對圍巖的影響主要在4-5倍的洞徑范圍內。最大位移發(fā)生在拱頂、拱肩和拱腳處,并向周圍擴散。 并且對V級圍巖條件下,三臺階法和進行短臺階、短進尺優(yōu)化后的兩臺階法的模擬結果進行對比,論證了V級圍巖條件下兩臺階法的適用性。為類似的隧道工程提供有益的工程依據。
[Abstract]:In recent years, along with the economic development, the transportation infrastructure construction speeds up step by step. Especially the implementation of western development strategy and the construction of four vertical and four horizontal high-speed railway, tunnel construction has been pushed to a new peak. Tunnels will continue to increase in the coming years. The stability of surrounding rock is the basic condition of the safe construction of tunnel. How to maintain the stability of surrounding rock is one of the most basic problems in tunnel engineering. Therefore, scholars at home and abroad have carried out a lot of research work on the stability of surrounding rock by using various research methods. And achieved fruitful results. Based on the Hulushan Tunnel Project of Jin-Qin passenger dedicated Line, this paper analyzes the influence of three different construction methods on the stability of surrounding rock. The main contents and conclusions are as follows: firstly, select the section with large deformation as the typical section and analyze the cause of deformation. It is concluded that the surrounding rock deformation of the three construction methods has experienced four stages, namely, advance displacement release stage, sharp deformation stage, slow deformation stage and deformation stabilization stage before excavation. In the stage of rapid deformation, the amount of deformation is large, and the instability is most likely to occur. Secondly, the convergence value of clearance, the settlement value of arch roof and the duration of sharp deformation stage of general section (that is, all sections with complete monitoring data) are analyzed statistically, and the normal distribution fitting method is used. The applicability of three class law, two class method and full section method is demonstrated. It is concluded that most of the monitoring sections will deform rapidly after one month and enter the stage of slow deformation. So a month after excavation is the best time to make two linings. Thirdly, the deformation law of surrounding rock under three construction methods, three class method, two step method and full section method, are studied by numerical simulation, and the results are compared with the measured data. It is concluded that the deformation law of the surrounding rock is the downward subsidence of the arch roof, the uplift of the bottom and the convergence of the surrounding rock to the middle. The influence of tunnel excavation on surrounding rock is mainly in the range of 4-5 times diameter. Maximum displacement occurs at the vault, shoulders and arches and diffuses around. And the simulation results of three step method and two class method after short step and short scale optimization under V class surrounding rock condition are compared, and the applicability of two class method under V class surrounding rock condition is proved. It provides beneficial engineering basis for similar tunnel engineering.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U451.2

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