發(fā)布時(shí)間：2018-05-24 09:47

  本文選題：黃土隧道 + 機(jī)械預(yù)切槽法�。� 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：隨著我國(guó)隧道建設(shè)的快速發(fā)展,復(fù)雜地質(zhì)和勞動(dòng)力緊缺等問(wèn)題越來(lái)越多。能適用復(fù)雜地質(zhì)和環(huán)境的機(jī)械化開(kāi)挖方式,將會(huì)是隧道建設(shè)的發(fā)展趨勢(shì)。機(jī)械預(yù)切槽法作為一種獨(dú)特的施工技術(shù),可適合復(fù)雜的地質(zhì)和環(huán)境,同時(shí)可大大提高施工的機(jī)械化水平。其在法國(guó)、意大利、日本等國(guó)家得到了較為廣泛的應(yīng)用,隨著我國(guó)隧道建設(shè)面臨的復(fù)雜地質(zhì)和環(huán)境問(wèn)題的增多以及對(duì)機(jī)械化的迫切需要,這種技術(shù)將再次引起關(guān)注,因此對(duì)預(yù)切槽技術(shù)的研究是很有必要的。 本文依托現(xiàn)場(chǎng)試驗(yàn)段并通過(guò)數(shù)值模擬手段,對(duì)預(yù)切槽法開(kāi)挖黃土隧道進(jìn)行了研究,主要工作內(nèi)容和成果包括： (1)從覆土厚度、地層參數(shù)等方面研究了預(yù)切槽法開(kāi)挖黃土隧道的地層變形規(guī)律,同時(shí)與傳統(tǒng)黃土隧道開(kāi)挖方法做了對(duì)比分析。 (2)預(yù)切槽法合理支護(hù)參數(shù)研究。對(duì)預(yù)襯砌的長(zhǎng)度、搭接長(zhǎng)度及厚度做了對(duì)比分析,并針對(duì)試驗(yàn)段工況,確定了合理的支護(hù)參數(shù)。 (3)對(duì)比了采用兩種不同的預(yù)襯砌長(zhǎng)度(5m、12m)時(shí)的洞周變形和預(yù)襯砌應(yīng)力,并對(duì)12m長(zhǎng)預(yù)襯砌的情況從掌子面前方土體預(yù)加固和輔助措施兩方面做了進(jìn)一步分析。 (4)預(yù)切槽法施工下的掌子面穩(wěn)定性問(wèn)題研究。介紹了掌子面穩(wěn)定性的影響因素和破壞機(jī)理,同時(shí)引用了邊坡穩(wěn)定的方法分析掌子面的穩(wěn)定性。 (5)實(shí)例分析。通過(guò)隧道洞周變形和預(yù)襯砌應(yīng)力兩方面的對(duì)比分析,確定了現(xiàn)場(chǎng)試驗(yàn)段的開(kāi)挖方式和仰拱封閉距離。
[Abstract]:With the rapid development of tunnel construction in China, there are more and more problems such as complex geology and labor shortage. Mechanized excavation mode which can be applied to complex geology and environment will be the development trend of tunnel construction. As a unique construction technology, mechanical pre-cutting method can adapt to complicated geology and environment, and greatly improve the mechanization level of construction. It has been widely used in France, Italy, Japan and other countries. With the increase of complex geological and environmental problems in tunnel construction in China and the urgent need for mechanization, this technology will once again attract attention. Therefore, it is necessary to study the technology of pre-cutting slot. Based on the field test section and numerical simulation method, this paper studies the excavation of loess tunnel by pre-cutting method. The main work and results are as follows: 1) the formation deformation of loess tunnel excavated by precut groove method is studied from the aspects of overlying soil thickness and stratum parameters, and is compared with that of traditional loess tunnel excavation method. 2) study on reasonable support parameters of pre-cutting groove method. The length, lap length and thickness of the pre-lining are compared and analyzed, and the reasonable supporting parameters are determined according to the working conditions of the test section. The deformation around the hole and the stress of the pre-lining are compared when two different pre-lining lengths are adopted. The condition of the pre-lining with 12m long is further analyzed from the aspects of soil pre-reinforcement and auxiliary measures in front of the face. 4) study on the stability of the face of the palm under the construction of the pre-cutting groove method. This paper introduces the influencing factors and failure mechanism of palm face stability, and analyses the stability of palm face by using slope stability method. Case study. Through the comparative analysis of tunnel circumference deformation and pre-lining stress, the excavation mode and the closed distance of inverted arch are determined.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U452.11

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本文編號(hào)：1928605