本文選題：小凈距隧道 + 地應(yīng)力��； 參考：《北京交通大學(xué)》2016年碩士論文

【摘要】：作為分離式隧道的補(bǔ)充型式,小凈距隧道可以有效解決分離式隧道最小凈距要求所帶來的占地面積大、開挖土方多、展線不靈活、高邊坡等問題。在地形限制、地層改變等情況下,雙洞單線分離式隧道變?yōu)閱味措p線大斷面隧道時(shí),過渡段也必然會(huì)出現(xiàn)小凈距段落,因此對(duì)小凈距隧道的研究工作日益重要。由于小凈距隧道的研究工作尚不全面,尤其是對(duì)穿越西南山區(qū)活動(dòng)斷裂帶的設(shè)計(jì)理論和應(yīng)用未達(dá)成熟,無法滿足實(shí)際工程的需要。本文所依托工程成蘭鐵路柿子園隧道位于龍門山斷裂帶,其小凈距段落穿越兩條斷層活動(dòng)帶,構(gòu)造應(yīng)力顯著,在小凈距隧道施工時(shí)易出現(xiàn)圍巖及支護(hù)結(jié)構(gòu)的穩(wěn)定性破壞。通過對(duì)現(xiàn)場調(diào)研、理論分析、室內(nèi)試驗(yàn)、地應(yīng)力測(cè)試、數(shù)值模擬、現(xiàn)場監(jiān)測(cè)等方法的綜合運(yùn)用,對(duì)穿越斷層破碎帶、局部高地應(yīng)力突出的小凈距隧道變形特性及應(yīng)力特性進(jìn)行研究。(1)通過資料收集分析與現(xiàn)場調(diào)研,對(duì)柿子園隧道隧址區(qū)的地層巖性、地質(zhì)構(gòu)造有一個(gè)較為清晰的認(rèn)識(shí)。利用周邊鉆孔分析成果和現(xiàn)場地應(yīng)力測(cè)試結(jié)果相互比較驗(yàn)證,對(duì)隧址區(qū)的地應(yīng)力環(huán)境進(jìn)行評(píng)價(jià),同時(shí)分析地應(yīng)力對(duì)圍巖穩(wěn)定性的影響；通過巖樣的室內(nèi)試驗(yàn)取得圍巖巖塊的物理力學(xué)參數(shù),運(yùn)用H-B準(zhǔn)則得出較為可靠的隧道圍巖力學(xué)參數(shù)。(2)在取得隧道現(xiàn)場圍巖力學(xué)參數(shù)及了解地層結(jié)構(gòu)特征的情況下,利用大型有限差分軟件Flac3D對(duì)小凈距隧道進(jìn)行數(shù)值模擬施工,取得其在不同條件下施工時(shí)對(duì)應(yīng)的的應(yīng)力特性、變形特征,分析了圍巖巖性、隧道凈距、水平應(yīng)力等因素的變化對(duì)小凈距隧道施工穩(wěn)定性的影響,之后通過調(diào)整設(shè)計(jì)方案及施工方法進(jìn)行襯砌結(jié)構(gòu)力學(xué)狀態(tài)的優(yōu)化研究,得到高地應(yīng)力環(huán)境下穿越斷層影響帶的小凈距隧道合理的穩(wěn)定性控制技術(shù)。(3)通過對(duì)實(shí)際工程施工過程中的應(yīng)力、變形等數(shù)據(jù)進(jìn)行監(jiān)測(cè)統(tǒng)計(jì),分析了實(shí)際工程中圍巖應(yīng)力及位移的變化規(guī)律,后行洞施工對(duì)鄰近先行洞的影響規(guī)律,為該隧道小凈距段落控制技術(shù)研究以及同類型工程提供參考。(4)通過對(duì)已有深埋軟巖隧道仰拱開裂的一般原因及處治措施進(jìn)行總結(jié),分析柿子園隧道仰拱開裂原因及開裂機(jī)理,針對(duì)性的提出開裂段落的整治措施和后續(xù)段的施工建議,最終取得良好的效果。
[Abstract]:As a supplementary type of separated tunnel, the small clear distance tunnel can effectively solve the problems of large area of land occupied, more earthwork excavation, inflexible stretch of line and high slope caused by the minimum net distance requirement of separated tunnel. Under the condition of terrain restriction and stratum change, when the double tunnel is changed into a single tunnel with two lines and large section, the transition section will inevitably appear small spacing section, so it is increasingly important to study the small clean distance tunnel. Because the research work of small clear distance tunnel is not comprehensive, especially the design theory and application of active fault zone crossing southwest mountain area is not mature, it can not meet the needs of practical engineering. The Shiziyuan tunnel of Cheng-Lan railway is located in the Longmenshan fault zone. The small spacing section of the tunnel passes through two active fault zones and the tectonic stress is significant. The surrounding rock and the stability of the supporting structure are easily destroyed in the construction of the tunnel with small clear distance. Through the comprehensive application of field investigation, theoretical analysis, laboratory test, in-situ stress test, numerical simulation, field monitoring and other methods, The deformation and stress characteristics of small clear distance tunnel with local high geostress are studied. 1) through data collection and field investigation, there is a clear understanding of stratigraphic lithology and geological structure in the tunnel area of Shiziyuan tunnel. The in-situ stress environment of tunnel site is evaluated by comparing the results of borehole analysis and in-situ stress test, and the influence of in-situ stress on the stability of surrounding rock is analyzed. The physical and mechanical parameters of surrounding rock block are obtained by laboratory test of rock samples, and the reliable mechanical parameters of surrounding rock mass of tunnel are obtained by H-B criterion. The large finite difference software Flac3D is used to simulate the construction of small distance tunnel. The corresponding stress characteristics and deformation characteristics of the tunnel under different conditions are obtained. The lithology of surrounding rock and the net distance of tunnel are analyzed. The influence of the change of horizontal stress and other factors on the construction stability of the tunnel with small clear distance is studied, and the optimization of the mechanical state of the lining structure is carried out by adjusting the design scheme and the construction method. The reasonable stability control technology of small distance tunnel crossing fault influence zone under high ground stress environment is obtained. The monitoring statistics of stress and deformation data in actual engineering construction are carried out. The variation law of surrounding rock stress and displacement in actual engineering is analyzed, and the influence law of rear tunnel construction on adjacent advance tunnel is analyzed. This paper provides a reference for the study of the control technology of the small spacing section of the tunnel and the same type of engineering. By summarizing the general causes and treatment measures of the inverted arch cracking of the existing deep buried soft rock tunnel, the paper analyzes the causes and mechanism of the cracking of the inverted arch of the Shiziyuan tunnel. Finally, good effect is obtained by putting forward the treatment measures of cracking section and construction suggestion of subsequent section.
【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】：2016
【分類號(hào)】：U455.4

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