發(fā)布時(shí)間：2018-06-03 09:54

  本文選題：飽和土 + 地鐵　； 參考：《浙江大學(xué)》2014年博士論文

【摘要】：我國(guó)城市軌道交通的建設(shè)規(guī)模迅速擴(kuò)大,所引起的環(huán)境振動(dòng)問題也日益突出。利用已有基礎(chǔ)理論成果,揭示地鐵列車荷載作用下軌道、襯砌和周圍飽和土體的振動(dòng)機(jī)理,準(zhǔn)確預(yù)測(cè)地鐵運(yùn)行引起周邊環(huán)境振動(dòng),具有非常重要的現(xiàn)實(shí)意義,相關(guān)的研究成果可以為線路設(shè)計(jì)、軌道設(shè)計(jì)、隔振減振設(shè)計(jì)等提供依據(jù)和標(biāo)準(zhǔn)。 在我國(guó)沿海地區(qū),大量地鐵建在飽和軟土地基中,采用飽和介質(zhì)理論模擬地鐵周圍土體比較接近實(shí)際情況。本文基于Biot飽和多孔介質(zhì)理論,以地鐵荷載、軌道系統(tǒng)、襯砌隧道以及周圍飽和土體為研究對(duì)象,首次用解析方法較為系統(tǒng)地研究了地鐵列車作用下軌道-襯砌-飽和土體耦合振動(dòng)的動(dòng)力特性。開展了如下研究： 1.采用Biot飽和多孔介質(zhì)模型來模擬土體,以解析方法研究了飽和土體全空間中無襯砌圓形隧洞在移動(dòng)點(diǎn)荷載作用下的三維動(dòng)力響應(yīng)。引入兩類勢(shì)函數(shù)來表示土骨架的位移和孔隙水壓力,使用Fourier變換方法,在不同環(huán)向模態(tài)下利用修正Bessel方程來求解各勢(shì)函數(shù),結(jié)合邊界條件,得到頻率-波數(shù)域內(nèi)位移及孔隙水壓力的解答,最后進(jìn)行雙重Fourier逆變換得到時(shí)間-空間域內(nèi)的響應(yīng)解。計(jì)算了飽和土體位移響應(yīng)隨速度變化的曲線及空間分布等,并根據(jù)算例結(jié)果分析了荷載速度、土體滲透性等對(duì)土體位移響應(yīng)的影響。 2.采用無限長(zhǎng)圓柱殼來模擬襯砌,采用Biot飽和多孔介質(zhì)模型來模擬土體,以解析方法研究了全空間飽和土中圓形襯砌隧道在簡(jiǎn)諧點(diǎn)荷載作用下的三維動(dòng)力響應(yīng)。根據(jù)外荷載特征,直接將外荷載和位移展開成波傳播形式,對(duì)飽和土體采用與之前類似的處理方式,結(jié)合邊界條件,求得了位移及孔隙水壓力的解答。計(jì)算了隧道周圍土體中一點(diǎn)、隧道仰拱及其下方土體的動(dòng)力響應(yīng),并根據(jù)計(jì)算結(jié)果分析了荷載振動(dòng)頻率和土體滲透性對(duì)土體和襯砌位移響應(yīng)及土體孔壓的影響。 3.以解析方法研究了飽和土體全空間中圓形襯砌隧道在移動(dòng)簡(jiǎn)諧點(diǎn)荷載作用下的三維動(dòng)力響應(yīng)。結(jié)合之前兩部分的工作,使用Fourier變換方法,求得了位移及孔隙水壓力的解答。計(jì)算了隧道襯砌及周圍土體響應(yīng)的空間分布及頻譜曲線等,并根據(jù)算例結(jié)果分析了荷載速度、荷載振動(dòng)頻率、土體滲透性、模量等對(duì)位移及孔壓的影響。 4.在之前工作的基礎(chǔ)上,首次以解析方法建立了“軌道結(jié)構(gòu)-襯砌-飽和土體全空間”耦合的三維動(dòng)力響應(yīng)模型。將荷載模擬成單個(gè)移動(dòng)簡(jiǎn)諧點(diǎn)荷載和一系列符合列車空間尺寸的移動(dòng)荷載。在頻率-波數(shù)域內(nèi),聯(lián)立軌道結(jié)構(gòu)動(dòng)力方程和仰拱處的位移頻率響應(yīng)函數(shù),獲得鋼軌、軌道板、隧道仰拱處的位移以及軌道板與襯砌之間的作用力。再利用所求位置的頻率響應(yīng)函數(shù)和軌道板與襯砌之間的作用力,獲得變換域中隧道結(jié)構(gòu)和土體的位移、孔壓。最終通過雙重Fourier逆變換,可得到鋼軌、軌道板、隧道結(jié)構(gòu)、飽和土體的時(shí)域響應(yīng)。研究了荷載移動(dòng)速度、荷載振動(dòng)頻率、土體滲透性等對(duì)軌道、襯砌及飽和土體響應(yīng)的影響。
[Abstract]:The construction scale of urban rail transit in China is expanding rapidly, and the environmental vibration problems are becoming more and more prominent. Using the existing basic theoretical results to reveal the vibration mechanism of the track, lining and surrounding saturated soil under the subway train load, and accurately predict the vibration of the surrounding environment caused by the subway operation, which is of great practical significance. The research results can provide basis and standard for line design, track design, vibration isolation and vibration reduction design.
In the coastal areas of China, a large number of subways are built in the saturated soft soil foundation, and the saturated medium theory is used to simulate the soil around the subway. Based on the theory of Biot saturated porous media, this paper studies the subway load, track system, lining tunnel and surrounding saturated soil as the research object. The analysis method is more systematic for the first time. The dynamic characteristics of coupling vibration between track and lining and saturated soil under the action of metro train are studied.
1. using the Biot saturated porous medium model to simulate the soil, the three-dimensional dynamic response of the circular tunnel without lining in the full space of the saturated soil under the moving point load is analyzed by the analytical method. Two kinds of potential functions are introduced to represent the displacement of the soil skeleton and the pore water pressure. The Fourier transformation method is used to make use of the correction under different circumferential modes. The Bessel equation is used to solve every potential function, and the solution of the displacement and pore water pressure in the frequency wave number domain is obtained by combining the boundary conditions. Finally, the response solution in the time space domain is obtained by the double Fourier inversion. The curves of the displacement response of the saturated soil with the velocity variation and the space distribution are calculated, and the load speed is analyzed according to the results of the calculation. The influence of permeability and soil permeability on soil displacement response is also discussed.
2. an infinite cylindrical shell is used to simulate the lining and the Biot saturated porous medium model is used to simulate the soil. The three-dimensional dynamic response of the circular lining tunnel under the simple harmonic load is analyzed by the analytical method. The external load and displacement are directly spread into the wave propagation form according to the characteristics of the external load, and the saturated soil is used. The solution of the displacement and pore water pressure is solved with the boundary condition, and the response of a point in the soil around the tunnel, the dynamic response of the tunnel inverted arch and the soil below is calculated, and the effect of the vibration frequency of the load and the permeability of the soil on the displacement response of the soil and lining and the pore pressure of the soil is analyzed.
3. the three-dimensional dynamic response of the circular lining tunnel under the moving simple point load is studied by the analytical method. With the work of the previous two parts, the solution of the displacement and pore water pressure is solved by using the Fourier transformation method. The spatial distribution and spectrum curve of the response of tunnel lining and circumference of surrounding soil are calculated. The effects of load speed, load vibration frequency, permeability and modulus of soil on displacement and pore pressure are analyzed based on the results of calculation.
4. on the basis of previous work, a three-dimensional dynamic response model of "track structure lining saturated soil whole space" was established for the first time. The load was simulated as a single moving simple point load and a series of moving loads in line with the space size of the train. In the frequency wave number domain, the dynamic equations and the pitching of the simultaneous orbital structure were raised. With the displacement frequency response function of the arch, the displacement of the rail, the track plate, the tunnel arch and the force between the track plate and the lining are obtained. The displacement of the tunnel structure and the soil mass and the pore pressure in the transform domain are obtained by using the frequency response function of the position and the force between the track plate and the lining. The response of the rail, track plate, tunnel structure and saturated soil in time domain can be obtained. The effects of load moving velocity, load vibration frequency, soil permeability and so on on the response of track, lining and saturated soil are studied.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：U211.3;U452.28

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 ;關(guān)于機(jī)車車輛/軌道系統(tǒng)隨機(jī)激勵(lì)函數(shù)的研究[J];長(zhǎng)沙鐵道學(xué)院學(xué)報(bào);1985年02期

2 劉維寧,張昀青;軌道結(jié)構(gòu)在移動(dòng)荷載作用下的周期解析解[J];工程力學(xué);2004年05期

3 高盟;高廣運(yùn);王瀅;楊成斌;熊浩;;飽和土與襯砌動(dòng)力相互作用的圓柱形孔洞內(nèi)源問題解答[J];固體力學(xué)學(xué)報(bào);2009年05期

4 劉干斌,謝康和,施祖元;黏彈性飽和多孔介質(zhì)中圓柱孔洞的頻域響應(yīng)[J];力學(xué)學(xué)報(bào);2004年05期

5 邊學(xué)成,陳云敏;列車荷載作用下軌道和地基的動(dòng)響應(yīng)分析[J];力學(xué)學(xué)報(bào);2005年04期

6 楊峻,宮全美,吳世明,胡亞元;飽和土體中圓柱形孔洞的動(dòng)力分析[J];上海力學(xué);1996年01期

7 金波;高速荷載下多孔飽和地基的動(dòng)力響應(yīng)[J];力學(xué)季刊;2004年02期

8 張玉娥;潘昌實(shí);;地鐵區(qū)間隧道列車振動(dòng)響應(yīng)測(cè)試與數(shù)值分析[J];石家莊鐵道學(xué)院學(xué)報(bào);1993年02期

9 黃曉吉;扶明福;徐斌;黎劍華;;簡(jiǎn)諧環(huán)形荷載作用下飽和土體中圓形襯砌隧洞的動(dòng)力響應(yīng)研究[J];鐵道建筑;2011年01期

10 翟婉明;車輛-軌道垂向系統(tǒng)的統(tǒng)一模型及其耦合動(dòng)力學(xué)原理[J];鐵道學(xué)報(bào);1992年03期

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