發(fā)布時(shí)間：2018-04-06 01:01

  本文選題：溶腔分布　切入點(diǎn)：水壓充填型溶腔　出處：《重慶大學(xué)》2014年碩士論文

【摘要】：應(yīng)用新奧法修建隧道，特別是富水區(qū)域的隧道工程時(shí)，承壓地下水的防治若處理不當(dāng)，將會(huì)造成突水，突泥等安全事故，嚴(yán)重影響隧道施工人員的生命安全及生產(chǎn)成本，同樣也會(huì)對(duì)隧道運(yùn)營期間的安全與維護(hù)產(chǎn)生影響。近年來，我國修建了大批山嶺隧道、水下隧道、礦山隧道。這些隧道穿越富水地帶的情況越來越多，其中以水壓充填型溶腔對(duì)隧道的影響尤其明顯，由于溶腔中存在高水壓力，隧道建設(shè)過程極有可能誘發(fā)突水事故，嚴(yán)重威脅隧道施工安全。針對(duì)這一現(xiàn)狀，在總結(jié)國內(nèi)外現(xiàn)有研究成果的基礎(chǔ)上，采用理論分析和數(shù)值模擬的方法對(duì)水壓填充型溶腔與隧道掌子面間的安全厚度等問題進(jìn)行了較為系統(tǒng)深入的研究。主要內(nèi)容和成果如下： ①分析總結(jié)了有水壓充填型溶腔的隧道發(fā)生突水災(zāi)害的影響因素，得出隧道突水主要受水壓力、地應(yīng)力、圍巖結(jié)構(gòu)和物理力學(xué)性質(zhì)以及隧道所在區(qū)域工程地質(zhì)條件因素的影響，同時(shí)也受到隧道斷面大小、隧道開挖速度以及預(yù)留的安全厚度等施工因素的影響。 ②通過對(duì)依托工程進(jìn)行數(shù)值模擬計(jì)算，分析了當(dāng)溶腔中的水壓力一定時(shí)，在流固耦合作用下，隧道發(fā)生突水事故時(shí)溶腔與隧道掌子面間的厚度，并提出了溶腔與隧道掌子面預(yù)留安全厚度的建議值，建議2MPa水壓力作用下，預(yù)留安全厚度不宜小于6m. ③通過對(duì)依托工程進(jìn)行數(shù)值模擬計(jì)算，分析了不同水壓力作用下溶腔與隧道掌子面間的安全厚度值，地應(yīng)力與水壓力耦合作用下的安全厚度值，隧道不同圍巖強(qiáng)度等級(jí)的安全厚度值，研究結(jié)果表明：水壓力每增加0.5MPa，溶腔與隧道掌子面間的安全厚度宜增加2～4m；隨著水平地應(yīng)力數(shù)值的增大，安全厚度的取值也隨之增加；隨著圍巖等級(jí)的降低，安全厚度取值也相應(yīng)增大。 ④通過對(duì)依托工程數(shù)值模擬分析，研究不同溶腔分布下隧道與溶腔間的安全厚度，，研究表明，在III級(jí)圍巖條件下，溶腔位于隧道頂部且溶腔內(nèi)水壓分別為1MPa、1.5MPa、2MPa時(shí)的安全厚度取值宜為8m、12m、16m；溶腔位于隧道右側(cè)且溶腔內(nèi)水壓分別為1MPa、2MPa、3MPa時(shí)的安全厚度取值宜為6m、8m、10m。
[Abstract]:In the construction of tunnels with New Austrian method, especially in water-rich areas, if the prevention and treatment of confined groundwater is not proper, it will cause water inrush, mud outburst and other safety accidents, which will seriously affect the life safety and production cost of tunnel construction personnel.It will also have an impact on the safety and maintenance of the tunnel during operation.In recent years, China has built a large number of mountain tunnels, underwater tunnels, mine tunnels.There are more and more cases of these tunnels crossing the water-rich zone, especially the influence of water-filled cavity on the tunnel. Due to the existence of high water pressure in the cavity, the tunnel construction process is likely to induce water inrush accidents.The safety of tunnel construction is seriously threatened.In view of this situation, on the basis of summarizing the existing research results at home and abroad, the safe thickness between water pressure filled cavity and tunnel face is studied systematically and deeply by the method of theoretical analysis and numerical simulation.The main elements and outcomes are as follows:The main results are as follows: (1) the influencing factors of water inrush disaster in the tunnel with water pressure filling cavity are analyzed and summarized. It is concluded that the water inrush is mainly affected by water pressure, ground stress, surrounding rock structure and physical and mechanical properties, as well as the engineering geological conditions in the region where the tunnel is located.At the same time, it is also affected by the tunnel section size, tunnel excavation speed and reserved safety thickness and other construction factors.2 through the numerical simulation calculation of the supporting engineering, the thickness between the solution cavity and the tunnel face is analyzed when the water pressure in the cavern is constant, and under the action of fluid-solid coupling, when the water inrush accident occurs in the tunnel, the thickness between the solution cavity and the face of the tunnel is analyzed.It is suggested that the reserved safe thickness of the cavity and tunnel face should not be less than 6 m under the action of 2MPa water pressure.(3) through numerical simulation of the supporting engineering, the safe thickness between the cavity and the tunnel face under different water pressure and the safety thickness value under the coupling of in-situ stress and water pressure are analyzed.The results show that the safe thickness between the cavity and the tunnel face should be increased by 2 ~ 4 m for the increase of water pressure at 0.5 MPA, and the safe thickness increases with the increase of horizontal stress.With the decrease of surrounding rock grade, the safe thickness value increases accordingly.(4) through numerical simulation analysis of supporting engineering, the safe thickness between tunnel and cavern under different distribution of dissolved cavities is studied. The results show that, under the condition of III grade surrounding rock,The safe thickness of the solution chamber located at the top of the tunnel and the water pressure in the cavity is 1 MPa1. 5 MPA, respectively, the safe thickness of the solution cavity should be 8 mg / 12mt ~ (16) m, and the safe thickness value is 6 m ~ (8) m ~ (10) m when the water pressure in the cavity is 1 MPA ~ 2 MPA and the water pressure in the cavity is 1 MPA ~ (2) MPA ~ (2) ~ (-1) MPA, respectively, at the right side of the tunnel.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U457.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 趙明階,徐容,劉緒華,敖建華,王彪;隧道頂部溶洞影響圍巖穩(wěn)定性的模型試驗(yàn)研究[J];地下空間;2003年02期

2 史世雍;梅世龍;楊志剛;;隧道頂部溶洞對(duì)圍巖穩(wěn)定性的影響分析[J];地下空間與工程學(xué)報(bào);2005年05期

3 王樹仁;何滿潮;劉招偉;;巖溶隧道突水災(zāi)變過程分析及控制技術(shù)[J];北京科技大學(xué)學(xué)報(bào);2006年07期

4 趙明階,敖建華,劉緒華,王彪;隧道底部溶洞對(duì)圍巖變形特性的影響分析[J];重慶交通學(xué)院學(xué)報(bào);2003年02期

5 臧守杰;綦彥波;程建鋁;;喀斯特地區(qū)隧道施工中隧底巖層穩(wěn)定性評(píng)價(jià)研究[J];水利與建筑工程學(xué)報(bào);2007年03期

6 黃明利;王飛;路威;譚忠盛;;隧道開挖誘發(fā)富水有壓溶洞破裂突水過程數(shù)值模擬[J];中國工程科學(xué);2009年12期

7 臧守杰;;強(qiáng)巖溶區(qū)隧道施工中隧底最小安全厚度分析研究[J];隧道建設(shè);2007年05期

8 孫謀;劉維寧;;隧道涌水對(duì)圍巖特性影響分析[J];隧道建設(shè);2008年02期

9 黎代仁;;側(cè)部水壓充填型巖溶隧道圍巖變形特征分析[J];路基工程;2009年04期

10 李治國;隧道巖溶處理技術(shù)[J];鐵道標(biāo)準(zhǔn)設(shè)計(jì);2003年S1期

相關(guān)博士學(xué)位論文 前2條

1 莫陽春;高水壓充填型巖溶隧道穩(wěn)定性研究[D];西南交通大學(xué);2009年

2 馬棟;深埋巖溶對(duì)隧道安全影響分析及處治技術(shù)研究[D];北京交通大學(xué);2012年

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