【摘要】：分岔隧道通常由大跨段、連拱段和小凈距段組成,其結(jié)構(gòu)型式和圍巖應(yīng)力分布較為復(fù)雜,是設(shè)計(jì)和施工的重難點(diǎn)工程,在地震中易發(fā)生嚴(yán)重的震害。因此,研究高烈度地震區(qū)分岔隧道的地震動(dòng)力響應(yīng)及其抗減震措施具有重要的工程價(jià)值和意義。本文以成蘭鐵路楊家坪隧道單雙線分岔過渡段為工程背景,通過數(shù)值計(jì)算研究了該分岔隧道的地震動(dòng)力響應(yīng),并對(duì)其抗減震措施進(jìn)行了研究,提出了適合該工程的抗減震措施。本文的主要工作和研究成果如下:(1)通過數(shù)值計(jì)算對(duì)比分析了有無中隔墻兩種工況下分岔隧道的中隔墻和中巖柱的地震動(dòng)力響應(yīng)的差異,研究表明:連拱隧道中隔墻所受拉應(yīng)力峰值和壓應(yīng)力峰值均比小凈距隧道中巖柱大,中隔墻所受切應(yīng)力較中巖柱大;隨著中巖柱寬度的增大,壓應(yīng)力的最大值由中巖柱邊角位置逐漸轉(zhuǎn)移到中巖柱的中心位置,推薦采用有中隔墻的方案。(2)建立楊家坪隧道單雙線分岔過渡段三維數(shù)值模型,研究其地震動(dòng)力響應(yīng),研究表明:各隧道拱頂與仰拱的水平相對(duì)位移較大;各隧道的對(duì)角線相對(duì)變形在分岔口、連拱段和小凈距段過渡時(shí)有明顯突變;大拱段和雙洞單線段的縱向相對(duì)位移變形較小;擋頭墻的變形較大,易發(fā)生震害;中隔墻與中巖柱過渡段靠近中巖柱一側(cè)拱肩和拱腳處內(nèi)力峰值存在較大突變;連拱段和小凈距段左、右拱腳和拱腰處襯砌結(jié)構(gòu)受力較大;擋頭墻處拱腳和拱腰位置的內(nèi)力相對(duì)較大,是抗震的薄弱部位。(3)研究了注漿范圍、擋頭墻參數(shù)和減震縫參數(shù)三種措施的抗減震效果。研究表明:注漿范圍越大,結(jié)構(gòu)內(nèi)力和位移越小,注漿范圍取擋頭墻前后4m效果最好;擋頭墻材料剛度越小,結(jié)構(gòu)內(nèi)力越小;設(shè)置減震縫能使其周邊一定范圍的結(jié)構(gòu)內(nèi)力得到顯著的降低,對(duì)于較遠(yuǎn)處位置的襯砌結(jié)構(gòu)的內(nèi)力則影響不大(4)隧道拱腳位置,特別是靠近中隔墻和中巖柱一側(cè)的拱腳部位是抗震的薄弱部位。
[Abstract]:Bifurcation tunnel is usually composed of long span section, multi arch section and small net distance section. Its structure type and stress distribution of surrounding rock are more complex, which is the most difficult engineering in design and construction, and it is easy to occur serious earthquake damage in earthquake. Therefore, it is of great engineering value and significance to study the seismic dynamic response of the bifurcation tunnel in the high intensity seismic area and the measures to resist and reduce the earthquake. In this paper, taking the transition section of Yangjiaping tunnel of Cheng-lan railway as the engineering background, the seismic dynamic response of the bifurcation tunnel is studied by numerical calculation, and the measures to resist and reduce the earthquake are studied, and the anti-seismic measures suitable for the project are put forward. The main work and research results of this paper are as follows: (1) the difference of seismic dynamic response between middle partition wall and middle rock column of bifurcation tunnel under two working conditions is analyzed by numerical calculation. The results show that the peak values of tensile stress and compressive stress in the middle wall of the multi-arch tunnel are larger than those in the middle rock column of the tunnel with small net distance, and the shear stress of the middle partition wall is larger than that of the medium rock column, and with the increase of the width of the middle rock column, the shear stress of the middle wall is larger than that of the middle rock column. The maximum compressive stress is gradually transferred from the edge corner position of the middle rock column to the center position of the middle rock column. It is recommended to adopt the scheme with a middle partition wall. (2) the 3-D numerical model of the transition section of Yangjiaping Tunnel with single and double lines bifurcation is established and its seismic dynamic response is studied. The results show that the horizontal relative displacement of the arch roof and inverted arch of each tunnel is large, the relative deformation of diagonal line of each tunnel has obvious abrupt changes during the transition of bifurcation, multi-arch and small net distance, the longitudinal relative displacement of large arch and double-hole single line is small, and the relative deformation of the diagonal line of each tunnel is relatively small during the transition of bifurcation, multi-arch and small net distance. The deformation of the retaining head wall is large, which is prone to earthquake damage, the peak value of internal force near the side arch shoulder and arch foot of the middle rock column in the transitional section of the middle partition wall and the middle rock column is abrupt, and the lining structure at the left, right arch foot and arch waist of the continuous arch section and the small net distance section is subjected to more stress. The internal force of arch foot and arch waist at the head wall is relatively large, which is the weak part of earthquake resistance. (3) the anti-seismic effect of grouting range, retaining wall parameter and damping joint parameter are studied. The results show that the larger the grouting range is, the smaller the internal force and displacement of the structure are, the better the effect is before and after taking the retaining head wall in the grouting range, the smaller the material stiffness of the retaining head wall is, the smaller the internal force of the structure is. The internal force of the structure in a certain range around it can be significantly reduced by setting the damping joint, but the internal force of the lining structure in the farther position has little effect (4) on the position of the arch foot of the tunnel. Especially the arch foot near the middle wall and the middle rock column is the weak part of earthquake resistance.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U459.1

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