本文關(guān)鍵詞：落石沖擊下拱形明洞結(jié)構(gòu)概率可靠性研究　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 落石沖擊 拱形明洞 結(jié)構(gòu)概率可靠性 剛塑性板 沖擊荷載 極限承載力

【摘要】：隨著高速鐵路向西部艱險(xiǎn)山區(qū)的延伸,鐵路隧道工程的修建難度和建設(shè)規(guī)模越來(lái)越大,但受地質(zhì)條件和施工擾動(dòng)等因素的影響,使得隧道洞口段成為最易遭受落石侵襲的地段,而拱形明洞結(jié)構(gòu)由于受力合理,抗沖擊性能強(qiáng),且與暗洞過(guò)渡自然等優(yōu)點(diǎn),日漸成為落石多發(fā)區(qū)普遍采用的防護(hù)措施。本文以客運(yùn)專線雙線隧道拱形明洞為研究對(duì)象,通過(guò)文獻(xiàn)調(diào)研,理論分析和三維顆粒流離散元(pFC3D)模擬的方法,對(duì)落石沖擊下拱形明洞結(jié)構(gòu)的概率可靠性進(jìn)行了系統(tǒng)研究,主要研究成果如下:1、通過(guò)對(duì)實(shí)際落石災(zāi)害和室內(nèi)模型試驗(yàn)的調(diào)研分析,結(jié)合離散元顆粒流模擬結(jié)果,可以確定落石沖擊下拱形明洞結(jié)構(gòu)表現(xiàn)為局部的失效破壞。根據(jù)落石沖擊下拱形明洞結(jié)構(gòu)的力學(xué)響應(yīng)特征和荷載分布形態(tài),可將明洞失效部分簡(jiǎn)化為四邊固支鋼筋混凝土方形板,按剛塑性板靜態(tài)失效荷載的計(jì)算方法,得出結(jié)構(gòu)在落石沖擊下的極限承載力表達(dá)式。2、利用三維顆粒流離散元模擬方法,對(duì)不同落石高度、不同落石重量及不同回填土厚度條件下,落石沖擊方形平板結(jié)構(gòu)試驗(yàn)進(jìn)行模擬,確定了平板不同尺寸范圍內(nèi)所受的落石沖擊荷載,結(jié)合對(duì)應(yīng)的工況組合條件,建立了關(guān)于落石沖擊中心集中力和均布?jí)毫Φ幕貧w分析表達(dá)式,以此來(lái)反映落石沖擊荷載的變化規(guī)律。3、根據(jù)已確定的結(jié)構(gòu)極限承載力和落石沖擊荷載聯(lián)立得到極限狀態(tài)方程,結(jié)合隨機(jī)變量的分布類型和概率統(tǒng)計(jì)特征,采用適用于包含非正態(tài)隨機(jī)變量可靠性分析的當(dāng)量正態(tài)化法,通過(guò)編寫MATLAB程序?qū)Y(jié)構(gòu)可靠指標(biāo)進(jìn)行計(jì)算,求得落石沖擊下拱形明洞結(jié)構(gòu)的可靠指標(biāo)最小值為2.85,對(duì)應(yīng)的失效破壞概率為0.219%。
[Abstract]:With the extension of high-speed railway to the western mountainous area, the construction difficulty and construction scale of railway tunnel project is becoming larger and larger, but it is affected by geological conditions and construction disturbance and other factors. The tunnel entrance section is the most vulnerable to rock fall, and the arch tunnel structure has the advantages of reasonable force, strong impact resistance and natural transition with the dark hole. This paper takes the double-line tunnel of passenger dedicated line as the research object, through the literature investigation. In this paper, the probabilistic reliability of the arch tunnel structure under the impact of rock drop is systematically studied by theoretical analysis and the method of three-dimensional particle flow discrete element pFC3D simulation. The main research results are as follows: 1. Through the investigation and analysis of the actual rock fall disaster and the indoor model test, combined with the simulation results of discrete element particle flow. According to the mechanical response characteristics and load distribution pattern of the open arch tunnel structure under rock fall impact, the local failure failure of the arch tunnel structure can be determined. The failure part of the open hole can be simplified as a quadrilateral fixed reinforced concrete square slab. According to the calculation method of static failure load of rigid-plastic plate, the expression .2 of ultimate bearing capacity of the structure under the impact of rock fall can be obtained. Three dimensional particle flow discrete element simulation method is used to simulate the slab structure test under the conditions of different falling height, different falling weight and different backfill thickness. The rock falling impact load in different size range of flat plate is determined. Combined with the corresponding working condition, the regression analysis expression about the concentrated force and uniform distribution pressure of rock falling impact center is established. According to the determined ultimate bearing capacity and rockfall impact load, the limit state equation is obtained, combined with the distribution type of random variables and probability and statistical characteristics. The equivalent normalization method, which is suitable for reliability analysis of non-normal random variables, is used to calculate the structural reliability index by writing MATLAB program. The minimum reliability index of the arch structure under rock fall impact is 2.85 and the corresponding failure probability is 0.21919.
【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)】：U451

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