【摘要】：新意法的核心理念是利用加固后的超前核心土為隧道穩(wěn)定的工具�；谛乱夥A(yù)加固原理的全斷面開(kāi)挖具有施工速度快、經(jīng)濟(jì)效益高等優(yōu)點(diǎn),并已在很多地質(zhì)條件相對(duì)較差的隧道工程中得以成功運(yùn)用。但其理論研究多數(shù)重在分析掌子面的擠出變形、預(yù)收斂變形及收斂變形,往往忽略了預(yù)加固措施對(duì)掌子面前方土體的影響。同時(shí),結(jié)合我國(guó)現(xiàn)階段隧道施工水平、機(jī)械化水平及復(fù)雜的地質(zhì)條件,預(yù)加固后的全斷面開(kāi)挖往往不能帶來(lái)應(yīng)有的效率及安全。而現(xiàn)階段的一些開(kāi)挖方式及超前加固方式,在一定程度上與新意法原理相契合。本文針對(duì)預(yù)加固對(duì)掌子面前方土體空間塑性屈服區(qū)域的影響及軟弱圍巖條件下全斷面開(kāi)挖適用性做了一些研究,具體完成的工作如下:(1)全面系統(tǒng)地介紹了新意法的基本理論,并總結(jié)了預(yù)加固措施在國(guó)內(nèi)外的研究及應(yīng)用現(xiàn)狀;(2)對(duì)掌子面的穩(wěn)定性原理作出了總結(jié),并分析了影響掌子面穩(wěn)定性的因素。通過(guò)水平條分掌子面前方土體進(jìn)行了算例分析,得到了掌子面穩(wěn)定性與核心土加固作用的關(guān)系;(3)通過(guò)對(duì)不同工況的數(shù)值模擬分析,系統(tǒng)地闡述了預(yù)加固措施對(duì)掌子面前方空間塑性屈服區(qū)域發(fā)展的影響,以及不同的核心土預(yù)加固長(zhǎng)度在不同圍巖條件下對(duì)空間塑性屈服區(qū)域、掌子面擠出位移等的影響。(4)在不同圍巖條件下對(duì)結(jié)合管棚支護(hù)的短臺(tái)階開(kāi)挖及掌子面玻璃纖維錨桿預(yù)加固的全斷面開(kāi)挖進(jìn)行了對(duì)比分析,并建議了在V級(jí)、VI級(jí)圍巖條件下的開(kāi)挖方式。最后,對(duì)現(xiàn)有的問(wèn)題和進(jìn)一步的研究進(jìn)行了簡(jiǎn)要的論述。
[Abstract]:The core idea of the new method is to use the reinforced advanced core soil as a tool for tunnel stability. The full section excavation based on the pre-reinforcement principle of the new method has the advantages of fast construction speed and high economic benefit, and has been successfully applied in many tunnel projects with relatively poor geological conditions. However, most of the theoretical research focuses on the analysis of extrusion deformation, pre-convergence deformation and convergent deformation of the palm surface, and often ignores the influence of the pre-reinforcement measures on the soil in front of the palm surface. At the same time, combined with the current tunnel construction level, mechanization level and complex geological conditions, the full section excavation after pre-reinforcement often can not bring the due efficiency and safety. At present, some excavation methods and advanced reinforcement methods are consistent with the principle of new method to a certain extent. In this paper, the influence of pre-reinforcement on the spatial plastic yield area of soil in front of palm surface and the applicability of full section excavation under the condition of weak surrounding rock are studied. The specific work is as follows: (1) the basic theory of the new method is introduced comprehensively and systematically, and the research and application status of the pre-reinforcement measures at home and abroad are summarized. (2) the stability principle of palm surface is summarized, and the factors affecting the stability of palm surface are analyzed. Through the analysis of the soil in front of the horizontal strip in front of the palm surface, the relationship between the stability of the palm surface and the reinforcement of the core soil is obtained. (3) through the numerical simulation analysis of different working conditions, the influence of pre-reinforcement measures on the development of plastic yield area in front of palm surface is systematically expounded. And different prereinforcement lengths of core soil under different surrounding rock conditions to the spatial plastic yield area, (4) under different surrounding rock conditions, the short step excavation of combined pipe shed support and the full section excavation of glass fiber bolt pre-strengthened on palm surface are compared and analyzed, and it is suggested that the excavation of short step combined with pipe shed support and full section excavation of glass fiber bolt pre-strengthened on palm surface should be in V grade. Excavation mode under the condition of VI class surrounding rock. Finally, the existing problems and further research are briefly discussed.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U455.4

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本文編號(hào)：2485873