本文選題：斜井 + 正洞�。� 參考：《重慶交通大學》2014年碩士論文

【摘要】：在長大山嶺隧道施工中,斜井與正洞交叉段的臨空面大,受力結(jié)構(gòu)復雜,在對開挖方法的確定、交叉段處巖土體的加固支護,以及施工監(jiān)控量測方面均有特殊的要求。其受力分析、支護措施、施工步序、控制爆破等的理論研究尚不完善,還處于總結(jié)和積累經(jīng)驗階段,因此,結(jié)合工程實踐研究和分析長大隧道交叉段施工力學行為,具有一定的現(xiàn)實意義。交叉段開挖完后,交叉段兩側(cè)正洞的開挖將再一次引起斜井與正洞交叉段巖體和支護結(jié)構(gòu)的應(yīng)力釋放和重分布,造成該段巖體和支護結(jié)構(gòu)力學行為發(fā)生變化,而斜井與正洞相交角度的不同,對交叉段巖體和初支結(jié)構(gòu)的力學行為產(chǎn)生的影響也將不同。 然而,目前國內(nèi)外關(guān)于長大隧道斜井與正洞交叉段在施工狀態(tài)下的力學行為研究還較少,因此,開展長大隧道斜井與正洞交叉段的開挖、初期支護應(yīng)力和變形的研究,分析斜井與正洞相交角度對交叉段及正洞普通段應(yīng)力和變形的影響,無論是對理論體系的完善,還是對長大隧道的建設(shè)均具有十分重要的意義。 本文以廈深鐵路大南山隧道為工程背景,針對Ⅲ級圍巖,采用數(shù)值模擬方法,建立了斜井與正洞交角分別為30°、60°、90°,以及大南山隧道1#斜井與正洞交叉段雙聯(lián)方案等四個模型,分析了斜井與正洞相交角度對交叉段圍巖的應(yīng)力、塑性區(qū)、噴射混凝土的應(yīng)力、隧道的變形的影響,比較了單斜井正交方案和雙聯(lián)方案力學行為上的不同。 研究發(fā)現(xiàn),對于交叉段圍巖最大主應(yīng)力σ1,相交角度越小,交叉段剛開挖完時最大拉應(yīng)力越大,當角度由90°變成60°時,增加3%,當角度由60°變成30°時,增加68%,相交角度越小,拉應(yīng)力增長越快；對于交叉段圍巖最小主應(yīng)力σ3,相交角度越小,交叉段最大壓應(yīng)力越大,在交叉段剛開挖完的情況下,當角度由90°變成60°時,增加49%,當角度由60°變成30°時,增加40%；在交叉段兩側(cè)正洞貫通后,當角度由90°變成60°時,增加41%,當角度由60°變成30°時,增加30%：對于交叉段圍巖的塑性應(yīng)變最大值,相交角度30°比60°和90°大了一個數(shù)量級,而相交角度60°和90°交叉段處的塑性應(yīng)變最大值相差不大；對于交叉段正洞垂直變形,相交角度越小,拱頂下沉越大,在斜井與正洞非正交的情況下,偏銳角側(cè)拱頂下沉大于偏鈍角側(cè)；大南山隧道1#斜井與正洞交叉段雙聯(lián)方案交叉段圍巖和初期支護的應(yīng)力、變形大于單斜井方案；應(yīng)加強對交叉段的支護,做好鎖口工作。
[Abstract]:In the construction of Changshanling tunnel, the face of the cross section between inclined well and main hole is large and the stress structure is complicated. There are special requirements in the determination of excavation method, the reinforcement and support of virgin soil in the crossing section, as well as the construction monitoring and measurement. The theoretical study of force analysis, supporting measures, construction sequence and controlled blasting is not perfect, and it is still in the stage of summing up and accumulating experience. Therefore, combined with engineering practice, the construction mechanics behavior of cross section of long and long tunnel is studied and analyzed. Has certain realistic significance. After the excavation of the cross section, the excavation of the main hole on both sides of the cross section will once again cause the stress release and redistribution of the rock mass and the supporting structure in the cross section of the inclined shaft and the main hole, resulting in the change of the mechanical behavior of the rock mass and the supporting structure. The influence of the angle of intersection between inclined well and normal hole on the mechanical behavior of rock mass and initial branch structure of cross section is also different. However, at home and abroad, there are few studies on the mechanical behavior of the cross section between the inclined well and the main tunnel in the long tunnel. Therefore, the research on the excavation, initial support stress and deformation of the cross section of the inclined well and the main hole in the long tunnel is carried out. It is of great significance to analyze the influence of intersection angle between inclined well and normal hole on stress and deformation of cross section and common section of main tunnel, not only to the perfection of theoretical system, but also to the construction of long and long tunnel. In this paper, based on the engineering background of Dannanshan Tunnel of Xia-Shen Railway, and aiming at the third grade surrounding rock, four models are established, such as the angle between inclined well and main hole is 30 擄~ 60 擄~ 90 擄, and the double scheme of crossing section between inclined well and main hole of Dannanshan Tunnel is established. The effects of the angle of intersection between inclined well and main hole on the stress, plastic zone, stress of shotcrete and deformation of tunnel are analyzed, and the difference of mechanical behavior between orthogonal scheme and double scheme of single inclined well is compared. It is found that the smaller the intersection angle is, the greater the maximum tensile stress is when the cross section is just excavated. When the angle is changed from 90 擄to 60 擄, the maximum principal stress 蟽 1 increases by 3 points, and when the angle is changed from 60 擄to 30 擄, the increase of 68% and the angle of intersection are smaller. For the minimum principal stress 蟽 3 of the surrounding rock of the cross section, the smaller the intersection angle is, the greater the maximum compressive stress of the cross section is. When the angle of the cross section is just excavated, when the angle is changed from 90 擄to 60 擄, the increase of 49% is increased, and when the angle is changed from 60 擄to 30 擄, When the angle is changed from 90 擄to 60 擄, the increase is 41%, and when the angle is changed from 60 擄to 30 擄, the increase is 30%: for the maximum plastic strain of the surrounding rock of the cross section, the intersection angle of 30 擄is an order of magnitude greater than that of 60 擄and 90 擄. For the vertical deformation of the cross section, the smaller the intersection angle, the greater the dome sinking, and when the inclined shaft and the main hole are not orthogonal, the maximum plastic strain at the intersection angle of 60 擄and 90 擄is not different. The stress of surrounding rock and initial support in the cross section of 1# inclined well and main hole in Dannanshan Tunnel is greater than that in single inclined shaft, and the support of crossing section should be strengthened and the locking work should be done well.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455

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