【摘要】：水平旋噴在國外已成功地應(yīng)用于各種軟弱不良地層的預(yù)支護加固中。最近幾年,水平高壓旋噴技術(shù)在國內(nèi)隧道軟弱圍巖加固中應(yīng)用較為廣泛,該技術(shù)是在常規(guī)旋噴技術(shù)的基礎(chǔ)上,發(fā)展起來的一項新的地層加固施工技術(shù)。措施不到位,不但危及施工安全,甚至?xí)绊懙竭\營安全。而超前預(yù)加固技術(shù)不僅可以提高軟弱地層的強度和圍巖穩(wěn)定性,更重要的是可以保證在安全的前提下高效、順利地完成施工任務(wù)。為克服在地下水富集的粉細砂層圍巖中施工存在困難的技術(shù)難題,采用超前水平旋噴技術(shù),對隧道內(nèi)的富水粉細砂軟弱地層進行超前預(yù)加固,形成的固結(jié)體不僅可以提高樁體周圍的巖體強度,而且起到了很好的防滲止水效果,成功解決了桃樹坪隧道富水粉細砂層中存在的施工難題,具有廣闊的應(yīng)用前景。本文依托蘭榆鐵路桃樹坪隧道工程,通過對隧道工程圍巖特性研究,對水平旋噴超前預(yù)加固技術(shù)和掌子面穩(wěn)定性進行初步分析,主要內(nèi)容包括:1、分析探討了富水第三系粉細砂層成因環(huán)境、物質(zhì)組成、結(jié)構(gòu)構(gòu)造、成巖程度以及隧道開挖后,圍巖自穩(wěn)性差,產(chǎn)生大變形,發(fā)生外擠、坍塌、塑化、流變、甚至涌砂、涌水現(xiàn)象的根本原因。2、對水平旋噴樁預(yù)支護技術(shù)作用機理進行說明,同時對水平旋噴樁技術(shù)方案進行一定的分析,總結(jié)了該工法的施工特點,工藝流程,參數(shù)控制,現(xiàn)場施工常見問題及處理措施,最后對水平旋噴效果進行分析得出水平旋噴樁有更好的經(jīng)濟效益,并對穩(wěn)定圍巖的穩(wěn)定起到了很好的作用。3、通過對不同斷面進行監(jiān)控分析,各斷面的圍巖壓力、接觸壓力、二襯鋼筋應(yīng)力值均處于壓力范圍內(nèi),采用水平旋噴超前預(yù)加固,圍巖變形、收斂值減少,有效的控制了隧道滲水。
[Abstract]:Horizontal rotary shotcrete has been successfully applied to the pre-supporting and strengthening of various weak and poor strata abroad. In recent years, horizontal high-pressure rotary jet technology has been widely used in soft surrounding rock reinforcement of tunnels in China. This technology is a new stratum reinforcement construction technology developed on the basis of conventional rotary injection technique. Measures are not in place, not only endanger the safety of construction, and even affect the safety of operations. The advanced pre-reinforcement technology can not only improve the strength of weak strata and the stability of surrounding rocks, but also ensure the high efficiency and smooth completion of construction tasks on the premise of safety. In order to overcome the difficult technical problems existing in the construction of the surrounding rock of fine sand bed enriched in groundwater, the advance horizontal jet technique was used to pre-reinforce the soft strata with rich water powder and fine sand in the tunnel, and the water-rich fine sand in the tunnel was pre-strengthened in advance. The consolidation body can not only improve the strength of rock mass around the pile, but also play a good anti-seepage and water-stop effect, and successfully solve the construction problems existing in the water-rich fine sand layer of Taoshuping Tunnel, which has a broad application prospect. In this paper, relying on the Taoshuping tunnel project of Lanyu Railway, through the study of the surrounding rock characteristics of the tunnel engineering, a preliminary analysis is made on the pre-strengthening technology and the stability of the palm surface of the horizontal rotary jet prereinforcement technology. The main contents are as follows: 1, The genetic environment, material composition, structure, diagenetic degree and tunnel excavation of water-rich Tertiary fine silty sand are analyzed and discussed. The surrounding rock has poor self-stability, large deformation, extruding, collapsing, plasticizing, rheological, and even sand gushing after tunnel excavation. 2. Explain the mechanism of horizontal rotary jet grouting pile pre-supporting technology, at the same time, analyze the technical scheme of horizontal rotary jetting pile, summarize the construction characteristics, technological process and parameter control of the construction method, and make an analysis of the technical scheme of horizontal rotary jetting pile, and summarize the construction characteristics, technological process and parameter control of this construction method. The common problems and treatment measures in site construction are discussed. Finally, it is concluded that horizontal rotary jet pile has better economic benefit and has a good effect on stabilizing surrounding rock. 3, through monitoring and analysis on different sections, the horizontal rotary jet pile has a better economic benefit. 3, through the monitoring and analysis of different sections, it is concluded that the horizontal rotary jet pile has a better economic benefit. The surrounding rock pressure, contact pressure and second lining reinforcement stress value of each section are all in the range of pressure. Horizontal rotary jet is used to pre-reinforce the surrounding rock, deformation of surrounding rock, decrease of convergence value, and effective control of tunnel seepage.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.7

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