本文選題：軟巖　切入點(diǎn)：隧道　出處：《重慶交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：地下工程軟弱圍巖支護(hù)是土木工程領(lǐng)域面臨的技術(shù)難題。論文引入圍巖松動(dòng)圈理論,采用預(yù)加固技術(shù),利用新型預(yù)應(yīng)力錨索(自適應(yīng)預(yù)應(yīng)力錨索)作為地下工程軟弱圍巖開挖初期支護(hù)手段,研究了軟巖地下工程預(yù)應(yīng)力錨索設(shè)計(jì)參數(shù)、結(jié)構(gòu)形式、施工工藝等問題。主要研究?jī)?nèi)容如下:①地下工程軟弱圍巖開挖應(yīng)力變化特性以及圍巖變形位移與圍巖支護(hù)抗力之間的關(guān)系。地下工程軟巖圍巖開挖后原巖應(yīng)力平衡遭到破壞,圍巖應(yīng)力調(diào)整,論文結(jié)合軟巖特性、地下工程斷面尺寸、預(yù)應(yīng)力錨索主動(dòng)支護(hù)原理等,對(duì)軟巖應(yīng)力變化特性、圍巖變形發(fā)展、主動(dòng)錨固力與塑性位移之間的關(guān)系進(jìn)行研究分析。②軟巖地下工程預(yù)應(yīng)力錨索結(jié)構(gòu)的選擇及支護(hù)設(shè)計(jì)參數(shù)的確定。選用了一種新型預(yù)應(yīng)力錨索(自適應(yīng)預(yù)應(yīng)力錨索)作為軟巖地下工程初期支護(hù)結(jié)構(gòu),可在軟弱圍巖開挖后適應(yīng)圍巖的變形與應(yīng)力重分布。自適應(yīng)預(yù)應(yīng)力錨索可根據(jù)圍巖支護(hù)抗力與位移,自動(dòng)調(diào)節(jié)錨索的拉力和變形量,以適應(yīng)圍巖大變形,還可以避免預(yù)應(yīng)力錨索因變形過大導(dǎo)致過載或破壞,達(dá)到加固軟巖地下工程大變形的目的。地下工程預(yù)應(yīng)力錨索支護(hù)設(shè)計(jì)參數(shù)包括錨索錨固力、長(zhǎng)度、間距與布置、傾角及錨固劑等。不同錨索結(jié)構(gòu)形式的錨固機(jī)理各不相同,具體分析了使用自適應(yīng)預(yù)應(yīng)力錨索支護(hù)大變形地下工程軟弱圍巖的錨固參數(shù)。③軟巖地下工程預(yù)應(yīng)力錨索的施工技術(shù)研究。自適應(yīng)預(yù)應(yīng)力錨索適合于大變形軟弱圍巖支護(hù)。自適應(yīng)錨索工程施工主要包括測(cè)量放樣、鉆孔、錨索制作及安裝、注漿、張拉及鎖定、封錨等工序,其施工工藝與傳統(tǒng)拉力型錨索基本相同,但局部施工有所差異。④以泛亞鐵路西線大理至瑞麗鐵路秀嶺隧道為例,初步分析軟弱圍巖大變形隧道采用自適應(yīng)預(yù)應(yīng)力錨索進(jìn)行初期支護(hù)的技術(shù)方案。
[Abstract]:The soft surrounding rock support of underground engineering is a technical problem in the field of civil engineering. In this paper, a new type of prestressed anchor cable (adaptive prestressed anchor cable) is used as the initial supporting method of soft surrounding rock in underground engineering, and the design parameters and structure form of prestressed anchor cable in soft rock underground engineering are studied. The main research contents are as follows: the stress variation characteristics of soft surrounding rock excavation and the relationship between the deformation displacement of surrounding rock and the support resistance of surrounding rock. The stress balance of original rock is destroyed after excavation of soft rock surrounding rock in underground engineering. The stress adjustment of surrounding rock, combined with the characteristics of soft rock, the size of section of underground engineering, the principle of active support of prestressed anchor cable, etc., the change of stress of soft rock and the development of deformation of surrounding rock, etc. The relationship between active anchoring force and plastic displacement is studied and analyzed. .2 selection of prestressed anchor cable structure and determination of supporting design parameters in soft rock underground engineering. A new type of prestressed anchor cable (adaptive prestressed anchor cable) is selected. As the initial support structure of soft rock underground engineering, It can adapt to the deformation and stress redistribution of the surrounding rock after the excavation of the weak surrounding rock. According to the support resistance and displacement of the surrounding rock, the self-adaptive prestressed anchor cable can automatically adjust the tensile force and deformation of the anchor cable to adapt to the large deformation of the surrounding rock. It can also avoid overloading or destruction of prestressed anchor cable due to excessive deformation, and achieve the purpose of strengthening soft rock underground engineering with large deformation. The design parameters of prestressed anchor cable support in underground engineering include anchor force, length, spacing and arrangement of anchor cable. The anchoring mechanism of different cable structures is different. This paper concretely analyzes the construction technology of prestressed anchor cable used to support large deformation underground engineering soft surrounding rock with adaptive prestressed anchor cable. 3. 3. The construction technology of prestressed anchor cable in soft rock underground engineering is analyzed. The adaptive prestressed anchor cable is suitable for large deformation soft circumference. Rock support. The construction of adaptive anchor cable engineering mainly includes surveying and lofting, Drilling, cable making and installation, grouting, tensioning and locking, sealing anchor and so on, the construction technology is basically the same as that of the traditional tension anchor cable, but the partial construction is different. 4. Take the Xiuling Tunnel of the west line of the Trans-Asian Railway from Dali to Ruili Railway as an example. The technical scheme of initial support with adaptive prestressed anchor cable in large deformation tunnel of soft surrounding rock is analyzed preliminarily.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.7

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