發(fā)布時間：2018-03-21 06:14

  本文選題：庫區(qū)公路　切入點：邊坡　出處：《長安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：庫區(qū)公路由于其所處地區(qū)地形地貌、水文地質(zhì)條件、自然人文環(huán)境的制約,導(dǎo)致其工程環(huán)境往往相比一般公路建設(shè)更為復(fù)雜。庫區(qū)公路的穩(wěn)定性不但受到巖土性質(zhì)、邊坡形式的影響,還受到庫區(qū)水位不斷漲落的影響,處治不當極易發(fā)生失穩(wěn)破壞。本文主要采用FLAC3D數(shù)值方法模擬得到了庫區(qū)公路邊坡在不同工況下的穩(wěn)定性變化,并利用FLAC3D建立流固耦合模型,采用強度折減法,得到了庫水位驟降過程中邊坡的穩(wěn)定系數(shù)變化及潛在的破壞形式的變化。根據(jù)邊坡穩(wěn)定性模擬的結(jié)果,提出了庫區(qū)邊坡的加固處治建議,對實際工程具有一定的指導(dǎo)意義。本文主要取得了以下的研究結(jié)論:(1)分析了庫水位在下降時,非穩(wěn)定滲流方程的建立,坡體內(nèi)浸潤線的確立及庫水驟降緩降對邊坡穩(wěn)定的影響。研究表明:長期高水位后的驟降對迎水坡是最不利的,主要是飽和坡體內(nèi)的孔隙水壓力來不及消散而形成向坡外滲流所致,而且多發(fā)生在浸潤線高、透水性差的較陡粘性土質(zhì)邊坡上。(2)利用FLAC3D軟件建立數(shù)值模型,采用強度折減法,研究了不同工況下庫水位漲落,尤其是當庫區(qū)水位發(fā)生驟降時,邊坡穩(wěn)定性的變化。結(jié)果表明:庫區(qū)公路邊坡在施工期的穩(wěn)定性主要受到邊坡土體的自重和坡面形式的影響;庫區(qū)公路邊坡在正常蓄水期由于水的滲透力作用往往安全系數(shù)得到提高;在庫水位發(fā)生驟降后,邊坡的安全系數(shù)迅速減小。經(jīng)放坡和拋石加固處治后,再次對庫區(qū)公路邊坡在不同工況的穩(wěn)定性進行了模擬,結(jié)果表明安全系數(shù)得到了較大的提高,確保了公路的正常運行。(3)對水位驟降過程中的邊坡安全系數(shù)的變化進行了分析。研究表明:在此過程中安全系數(shù)隨著水位下降呈現(xiàn)先減后略增的趨勢。在最危險水面高度處,邊坡的水平位移、豎直位移、整體位移等達到了最大值。因為坡內(nèi)水體來不及排出,與坡外水體形成的高水位差,使得下部坡體和坡腳有向外“剪出”的潛在破壞,此時的邊坡穩(wěn)定性最差。(4)利用FLAC3D軟件對經(jīng)放坡和拋石加固處治后的庫區(qū)公路邊坡,在不同工況下的穩(wěn)定性進行了模擬,結(jié)果表明:經(jīng)加固處治后,不同工況下其安全系數(shù)均得到了較大的提高,但上部可能出現(xiàn)局部失穩(wěn),應(yīng)采取必要措施。對于受庫水影響的高陡邊坡,建議采用放坡加固,且進行上部路基的加固和蓄水位以下的坡面防護;對于受庫水嚴重影響的浸水路基,可采用擋土墻加固,且應(yīng)注意設(shè)置排水系統(tǒng)。
[Abstract]:Because of the constraints of topography, hydrogeology and natural and humanistic environment, the engineering environment of the highway in the reservoir area is often more complex than that of the general highway construction, and the stability of the highway in the reservoir area is not only affected by the rock and soil properties, but also by the stability of the highway in the reservoir area. The influence of slope form is also affected by the constant fluctuation of water level in the reservoir area, and the improper treatment is very easy to occur instability damage. In this paper, FLAC3D numerical method is mainly used to simulate the stability changes of the highway slope in the reservoir area under different working conditions. The fluid-solid coupling model is established by FLAC3D, and the variation of slope stability coefficient and potential failure form during sudden drop of reservoir water level are obtained by using strength reduction method. According to the results of slope stability simulation, This paper puts forward some suggestions for reinforcement and treatment of slope in the reservoir area, which is of certain guiding significance for practical engineering. The following conclusions are obtained in this paper: 1) the establishment of unsteady seepage equation when the water level of reservoir is falling is analyzed. The establishment of the infiltration line in the slope and the influence of the sudden drop of reservoir water on the slope stability. The study shows that the sudden drop after a long period of high water level is the most disadvantageous to the slope facing the water. The main reason is that the pore water pressure in the saturated slope can not be dissipated and the seepage is formed out of the slope, and mostly occurs on the steep viscous soil slope with high infiltration line and poor permeability.) the numerical model is established by using FLAC3D software, and the strength reduction method is adopted. The fluctuation of reservoir water level under different working conditions is studied, especially when the water level of reservoir area drops suddenly, the stability of highway slope in reservoir area is mainly affected by the gravity of slope soil and the form of slope surface during the construction period. During the normal storage period, the safety factor of the highway slope in the reservoir area is often improved due to the effect of water permeability, and the safety factor of the slope decreases rapidly after the sudden drop of the reservoir water level. Thirdly, the stability of highway slope in reservoir area under different working conditions is simulated, and the results show that the safety factor has been greatly improved. The variation of slope safety factor during the sudden drop of water level is analyzed. The results show that the safety factor decreases first and then increases with the decrease of water level in this process. The horizontal displacement, vertical displacement, and overall displacement of the slope have reached the maximum value. Because the water in the slope cannot be discharged without time, the difference between the high water level of the water body outside the slope and the water body outside the slope makes the lower slope body and the foot of the slope have the potential damage of "shearing out" outwards. At this time, the slope stability is the worst. The stability of the reservoir area highway slope strengthened by sloping and riprap is simulated by using FLAC3D software. The results show that: after strengthening and treating, the stability of the slope under different conditions is simulated. The safety coefficient has been greatly improved under different working conditions, but the local instability may occur in the upper part, so the necessary measures should be taken. For the high and steep slope affected by reservoir water, it is suggested to reinforce the slope by sloping. The reinforcement of the upper subgrade and the protection of the slope below the storage water level, the retaining wall can be used to reinforce the flooded roadbed which is seriously affected by the reservoir water, and the drainage system should be set up.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U416.14

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