本文選題：隧洞結(jié)構(gòu) + 地震響應(yīng)　； 參考：《北京科技大學(xué)》2015年博士論文

【摘要】：隨著我國經(jīng)濟(jì)建設(shè)的飛速發(fā)展,高速公路、鐵路(包括地鐵)建設(shè)中涉及的隧道及地下工程越來越多。我國在隧道及地下工程抗震研究方面剛開始起步,目前隧道及地下工程抗震設(shè)計(jì)主要還是參照地上建筑結(jié)構(gòu)的抗震設(shè)計(jì)規(guī)范。在汶川地震中大量的隧道及地下結(jié)構(gòu)工程遭到了嚴(yán)重的破壞,有的已經(jīng)無法修復(fù),這說明實(shí)際地震中產(chǎn)生的荷載水平比工程設(shè)計(jì)中采用的地震荷載水平要大許多。顯然,地下工程抗震設(shè)計(jì)參照地上建筑結(jié)構(gòu)的抗震設(shè)計(jì)是不合適的。因此,研究地震波作用下隧道及地下工程結(jié)構(gòu)的動力響應(yīng)特征及減震措施具有十分重要的現(xiàn)實(shí)意義。本論文主要從理論研究、數(shù)值模擬、試驗(yàn)研究和工程應(yīng)用等方面對地震波作用下土體中隧道及地下工程的動力響應(yīng)進(jìn)行了深入研究。主要工作內(nèi)容包括以下方面： (1)考慮水、土兩相耦合作用,對飽和土體中孔洞結(jié)構(gòu)在地震波作用下的動力響應(yīng)進(jìn)行了分析。根據(jù)飽和土Biot理論及地震波孔洞散射特性,采用積分變換和引入勢函數(shù)的方法,推導(dǎo)出由水、土兩相耦合作用的飽和土體Green函數(shù),建立了半無限空間飽和土體中孔洞對地震波散射問題的邊界元積分方程。通過計(jì)算表明,地震波在傳播過程中,由于孔洞的存在會使孔洞周邊應(yīng)力增加2-5倍,因此在進(jìn)行隧道及地下結(jié)構(gòu)抗震設(shè)計(jì)時應(yīng)該充分考慮這一影響因素。同時,考慮隧洞邊界透水性對地震散射的影響,通過計(jì)算表明,其它條件相同,不透水邊界的隧洞應(yīng)力集中系數(shù)比透水邊界下的隧洞應(yīng)力集中系數(shù)大許多。 (2)將隧洞周邊土體采用飽和土Biot理論,隧洞襯砌采用考慮剪切和轉(zhuǎn)動變形的曲線梁振動理論,分析了地震波作用下飽和土體中圓形隧洞襯砌的動力響應(yīng)問題。對于飽和土體中的散射波場采用波函數(shù)展開法,曲線梁的振動控制微分方程采用一般化的微分求積法(GDQM)。由飽和土體與襯砌接觸處的位移協(xié)調(diào)條件,采用最小二乘法確定波函數(shù)未知系數(shù)項(xiàng)。計(jì)算結(jié)果表明：當(dāng)入射波頻率較低時,襯砌結(jié)構(gòu)的入射面與背對面的動力響應(yīng)幾乎是對稱的；隨著入射頻率的增加,襯砌結(jié)構(gòu)的入射面與背對面不再具有對稱性,且襯砌結(jié)構(gòu)的入射面的動力響應(yīng)要大于背對面。 (3)研究了土體分層情況下的飽和土體中隧道結(jié)構(gòu)在地震波作用下的動力響應(yīng)。由于地質(zhì)演變等原因,實(shí)際工程中土體是分層的,所以采用層狀土體模型更能夠反映工程實(shí)際土體的特征。本文采用有限差分方法對地震波作用下層狀飽和土體中隧道襯砌結(jié)構(gòu)的動力響應(yīng)進(jìn)行求解,并以南昌地鐵1號線珠江站地鐵隧道為工程背景建立計(jì)算模型,計(jì)算分析了地鐵隧道結(jié)構(gòu)的動力響應(yīng),并給出相關(guān)的減震措施建議,為工程設(shè)計(jì)和施工提供參考。 (4)對飽和士體中隧洞結(jié)構(gòu)在地震波作用下的動力響應(yīng)進(jìn)行了室內(nèi)模型試驗(yàn),同時以江西都九高速公路溫泉隧道為工程背景,對溫泉隧道襯砌結(jié)構(gòu)進(jìn)行人工爆破地震作用下的動力響應(yīng)原型測試試驗(yàn),測試結(jié)果為理論研究和工程設(shè)計(jì)與施工提供了可靠的試驗(yàn)數(shù)據(jù)。
[Abstract]:With the rapid development of China's economic construction, there are more and more tunnels and underground projects involved in the construction of highways, railways (including the subway). China has just begun to start in the seismic research of tunnel and underground engineering. At present, the seismic design of tunnel and underground engineering is mainly concerned with the seismic design specification of the building structure on the ground. In Wenchuan A large number of tunnels and underground structures in the epicenter have been severely damaged and some can not be repaired. This shows that the level of the load produced in the actual earthquake is much larger than that of the engineering design. Obviously, the seismic design of the seismic design of the underground engineering is not suitable for the construction of the structure. Therefore, the research site is not suitable. The dynamic response characteristics of tunnel and underground engineering structures under seismic waves are of great practical significance. In this paper, the dynamic response of tunnel and underground engineering under seismic wave action is studied in depth from theoretical research, numerical simulation, experimental research and engineering application. Including the following aspects:
(1) considering the interaction of water and soil two phase, the dynamic response of pore structure in saturated soil under the action of seismic wave is analyzed. According to the Biot theory of saturated soil and the scattering characteristics of seismic wave hole, the Green function of saturated soil is derived by integrating the integral transformation and introducing the potential function, and the half no one is established. The boundary element integral equation for the scattering of seismic waves in a space saturated soil is calculated. The calculation shows that the stress of the hole is increased by 2-5 times in the course of the propagation of the seismic waves because of the existence of holes. Therefore, the influence factors should be taken into full consideration in the seismic design of the tunnel and the underground structure. The effect of water permeability on seismic scattering shows that the stress concentration coefficient of the tunnel under the pervious boundary is much larger than that under the pervious boundary by the calculation of the other conditions.
(2) the saturated soil Biot theory is adopted in the surrounding soil of the tunnel. The tunnel lining adopts the Liang Zhendong theory of curves considering shear and rotational deformation. The dynamic response of the circular tunnel lining in saturated soil under the action of seismic waves is analyzed. The wave function expansion method is adopted for the scattering wave field in saturated soil and the differential equation of vibration control of the curved beam is used. The general differential quadrature method (GDQM) is used to determine the unknown coefficient term of the wave function by the least square method. The results show that the dynamic response of the incident plane to the back is almost symmetrical when the frequency of the incident wave is low. The incident surface of the masonry structure is no longer symmetrical with the back face, and the dynamic response of the incident surface of the lining structure is larger than that of the back face.
(3) the dynamic response of tunnel structure under the action of seismic waves in saturated soil under soil stratification is studied. Due to geological evolution, the soil is stratified in actual engineering, so the layered soil model can be used to reflect the characteristics of the actual soil. This paper uses the finite difference method to saturate the seismic waves. The dynamic response of the tunnel lining structure in the soil is solved, and the calculation model is set up with the subway tunnel of the Pearl River Station of Nanchang Metro Line 1. The dynamic response of the subway tunnel structure is calculated and analyzed, and the relevant suggestions are given to provide reference for the engineering design and construction.
(4) an indoor model test is carried out on the dynamic response of the tunnel structure under the action of seismic waves in the saturated body. At the same time, the prototype test of the dynamic response of the lining structure of the hot spring tunnel under the artificial blasting action of the Jiangxi nine superhighway hot spring tunnel is carried out. The test results are the theoretical research and the engineering design and the engineering design. The construction provides reliable experimental data.

【學(xué)位授予單位】：北京科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：U452.28;TU311.3

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