本文關(guān)鍵詞： 明挖暗作法 數(shù)值模擬 穩(wěn)定性 控制技術(shù)　出處：《石家莊鐵道大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國經(jīng)濟飛速發(fā)展,鐵路公路路網(wǎng)逐漸完善。在高速公路、鐵路修建過程中,單座隧道同時下穿數(shù)座山嶺的情況時有發(fā)生。受地形條件及隧道平縱剖面設(shè)計等因素影響,隧道通過山谷處時,常出現(xiàn)超淺埋和偏壓的情況。并且兩山的山谷處往往風(fēng)化侵蝕嚴重、斷層破碎帶發(fā)育、雨季匯水集中,一般多系風(fēng)化破碎巖層,或堆積層、沖積層、坡積層等比較松軟的地層。因此,在確保安全、高效、低投入的前提下,采用怎樣的施工方案是山谷段隧道施工經(jīng)常面臨的問題。文以婁邵鐵路擴能改造工程中的同家村隧道為工程背景,提出了明挖暗作法通過山谷地段,并進行了幾下幾方面科研工作:(1)根據(jù)推測的監(jiān)控量測結(jié)果,通過BMP2000參數(shù)反演和有限元參數(shù)正演得出同家村隧道明挖暗作段圍巖參數(shù)。(2)根據(jù)前面對明挖暗作法工序詳細的介紹,作者先對明挖參數(shù)進行優(yōu)化,包括護拱的高度、驗證了邊坡的穩(wěn)定性、回填時機,又針對暗洞開挖時臺階長度、臺階高度、循環(huán)進尺等明挖暗作法的關(guān)鍵技術(shù),進行數(shù)值模擬,從洞周位移、圍巖塑性區(qū)分布、掌子面擠出變形和結(jié)構(gòu)內(nèi)力幾個方面比較分析結(jié)合實際施工情況綜合確定最適合的施工方法。(3)根據(jù)明挖暗作法整個施工過程以及施工工法優(yōu)化的結(jié)論,確定了出關(guān)于護拱的施作、明暗交界的處理、護拱結(jié)構(gòu)的穩(wěn)定和中下臺階圍巖的穩(wěn)定等施工過程中的關(guān)鍵技術(shù)參數(shù),這幾項關(guān)鍵技術(shù)對同家村隧道工程明挖暗作段的成敗起到了決定性作用。(4)根據(jù)明挖暗作段監(jiān)控量測結(jié)果結(jié)合工程實際施工情況,對同家村隧道明挖暗作法施工效果進行評價。
[Abstract]:With the rapid development of economy in our country, the railway highway network is gradually consummated. In the process of highway and railway construction, the situation of single tunnel passing through several mountains at the same time occurs from time to time, which is influenced by the terrain condition and the design of tunnel horizontal and longitudinal profile. When the tunnel passes through the valley, it often appears the situation of super shallow burying and bias. And the valley of the two mountains is often weathered and eroded seriously, the fault fracture zone is developed, the catchment of water is concentrated in the rainy season, and there are generally many systems of weathered broken rock, or accumulation, alluvium, etc. Sloping layers and other relatively soft formations. Therefore, under the premise of ensuring safety, efficiency and low investment, What kind of construction scheme is often faced by tunnel construction in valley section. Taking Tongjiacun Tunnel in Loushao Railway capacity expansion Project as the engineering background, this paper puts forward the method of open digging and dark digging through the valley section. Several aspects of scientific research work are also carried out. (1) according to the results of the speculated monitoring measurements, the parameters of surrounding rock of the open excavation and dark section of Tongjiacun Tunnel are derived by the inversion of BMP2000 parameters and the parameters of the finite element method.) according to the detailed introduction of the procedure of open excavation and dark excavation, The author first optimizes the open excavation parameters, including the height of the arch, verifies the stability of the slope, the timing of backfill, and carries out numerical simulation aiming at the key techniques of the dark excavation, such as the length of the step, the height of the step, the circular ruler, and so on. From the displacement around the hole, the distribution of the plastic zone of surrounding rock, Comparative analysis of extrusion deformation and structural internal force of palm face combined with actual construction conditions, the most suitable construction method is determined synthetically. (3) according to the conclusion of the whole construction process of open excavation and the optimization of construction method, The key technical parameters in the construction process, such as the construction of arch protection, the treatment of light and dark junction, the stability of arch structure and the stability of surrounding rock of middle and lower steps, are determined. These key technologies play a decisive role in the success or failure of the open excavation and dark work section of Tongjiacun tunnel project. According to the monitoring and measurement results of the open excavation and hidden work section, combined with the actual construction situation of the project, the construction effect of the open excavation and dark excavation method in Tongjiacun tunnel is evaluated.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.4

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