【摘要】：摘要：杭州地鐵1號線由于淺層沼氣的存在,使得運(yùn)營階段隧道襯砌在承受地層壓力的同時還可能承受到?jīng)_擊荷載,如高壓淺層氣的突出、爆炸等情況。本文以杭州地鐵1號線、西安地鐵2號線、獅子洋盾構(gòu)隧道、廣州地鐵2號線為背景,對變換局部荷載邊界條件下自由變形法理論解的修正和沖擊荷載下襯砌最大內(nèi)力的理論解做了較為系統(tǒng)的研究,其主要研究內(nèi)容如下： (1)對自由變形法和日本三角形反力法的內(nèi)力計(jì)算公式做了理論推導(dǎo),明確了推導(dǎo)過程與推導(dǎo)思路,為沖擊荷載下襯砌瞬時最大內(nèi)力的理論式推導(dǎo)提供了理論基礎(chǔ)； (2)在各工程實(shí)例的計(jì)算對比中,自由變形法的優(yōu)勢在于計(jì)算簡便快速。自由變形法適用于軟土地層,導(dǎo)致自由變形法計(jì)算偏差的最大原因是側(cè)向壓力的理論計(jì)算值與實(shí)際值差別過大。在側(cè)壓力系數(shù)較低的土層中應(yīng)用自由變形法時,可以通過修正側(cè)壓力系數(shù)的方法對其計(jì)算結(jié)果做出修正,提高其計(jì)算精度和適用范圍。 (3)以自由變形法為理論基礎(chǔ),推導(dǎo)出了沖擊荷載下襯砌最大內(nèi)力的理論計(jì)算式與時程內(nèi)力計(jì)算式,并與試驗(yàn)結(jié)果進(jìn)行了計(jì)算對比。
[Abstract]:Abstract: due to the existence of shallow biogas in Hangzhou Metro Line 1, the tunnel lining may bear the impact load at the same time as the formation pressure, such as the protruding of high pressure shallow gas, explosion and so on. The background of this paper is Hangzhou Metro Line 1, Xi'an Metro Line 2, Lion Ocean Shield Tunnel and Guangzhou Metro Line 2. The theoretical solution of free deformation method under the boundary condition of local load transformation and the theoretical solution of maximum internal force of lining under impact load are systematically studied. The main research contents are as follows: (1) the internal force calculation formulas of the free deformation method and the Japanese triangle reaction method are deduced theoretically, and the derivation process and thinking are clarified. It provides a theoretical basis for the theoretical derivation of the instantaneous maximum internal force of the lining under impact load. (2) in the comparison of engineering examples, the advantage of free deformation method is that the calculation is simple and fast. The free deformation method is suitable for soft soil formation. The biggest reason for the deviation of free deformation method is that the theoretical value of lateral pressure is too different from the actual value. When the free deformation method is applied in the soil layer with low lateral pressure coefficient, the calculation results can be modified by modifying the lateral pressure coefficient, and the calculation precision and applicable range can be improved. (3) based on the free deformation method, the theoretical calculation formula and the time-history internal force formula for the maximum internal force of the lining under impact load are derived and compared with the experimental results.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U231;U455.43

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