本文關(guān)鍵詞：深層滑坡體特長抗滑樁加固機理分析　出處：《蘭州交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 深層土體位移 特長抗滑樁監(jiān)測 加固機理 有限元模擬

【摘要】：本文依托重慶奉溪高速公路孫家崖隧道大坪滑坡抗滑樁治理工程為研究背景，由于孫家崖隧道穿越深層滑坡地段，所以采用特長抗滑樁治理深層滑坡體，以保證隧道不受滑坡的破壞，同時借助有限元數(shù)值模擬與現(xiàn)場實際監(jiān)測數(shù)據(jù)相結(jié)合的方法，對特長抗滑樁加固大坪滑坡的加固機理進行研究。 研究內(nèi)容和方法： （1）對特長抗滑樁護壁進行混凝土應(yīng)力、鋼筋軸力及樁后土壓力進行現(xiàn)場監(jiān)測，通過各項監(jiān)測數(shù)據(jù)研究抗滑樁施工過程中護壁的受力情況。 （2）通過7根測斜孔的監(jiān)測數(shù)據(jù)分析深層土體的位移變化情況，并根據(jù)位移峰值確定滑動面的位置。 （3）采用MIDAS-GTS有限元軟件建立抗滑樁加固滑坡體的二維和三維模型，通過分析滑坡的安全系數(shù)和位移變化情況研究滑坡體的安全性和穩(wěn)定性。 （4）建立特長抗滑樁施工過程的三維有限元模型，對模擬計算結(jié)果與監(jiān)測數(shù)據(jù)進行對比分析，研究樁開挖對樁周土體變形和應(yīng)力的影響。 主要研究成果： （1）通過測斜孔監(jiān)測數(shù)據(jù)分析得到大坪滑坡深層土體的位移變化情況，同時根據(jù)位移峰值得到該滑坡的淺層和深層滑動面深度分別為16~20m和36~40m。 （2）通過測斜孔監(jiān)測的滑動位移峰值繪制了滑坡體的淺層和深層滑動面。 （3）通過抗滑樁加固滑坡體的二維模擬得到，，滑坡經(jīng)過抗滑樁加固后安全系數(shù)由0.8875增大為1.2125，坡腳處最大位移由71.27cm降低為5.59cm。 （4）通過抗滑樁加固滑坡體的三維模擬得到，滑坡經(jīng)過抗滑樁加固后安全系數(shù)由0.9125增大為1.3225，坡腳處最大位移由91.63cm降低為9.54cm。 （5）對特長抗滑樁施工過程的監(jiān)測數(shù)據(jù)與數(shù)值模擬數(shù)據(jù)進行對比分析，并結(jié)合抗滑樁開挖深度的變化，總結(jié)得到抗滑樁在施工過程中圍巖應(yīng)力和位移隨著開挖深度的增大而增大。
[Abstract]:Based on the research background of Daping landslide anti-slide pile treatment project of Chongqing Fengxi Expressway Sun Jia Ya Tunnel, because Sun Jiaya Tunnel passes through the deep landslide section, the super long anti-slide pile is used to control the deep landslide body. In order to ensure that the tunnel will not be destroyed by landslide, the reinforcement mechanism of Daping landslide strengthened by super-long anti-slide pile is studied by combining the finite element numerical simulation with the actual monitoring data on the spot at the same time. Contents and methods of the study: 1) the concrete stress, the axial force of steel bar and the earth pressure behind the pile are monitored on the spot, and the stress of the protective wall during the construction of the anti-slide pile is studied through the monitoring data of the concrete stress, the axial force of the steel bar and the earth pressure behind the pile. 2) based on the monitoring data of 7 oblique holes, the displacement of deep soil is analyzed, and the position of sliding surface is determined according to the displacement peak value. MIDAS-GTS finite element software is used to establish 2D and 3D models of landslide body strengthened by anti-slide pile. The safety and stability of landslide are studied by analyzing the safety factor and displacement variation of landslide. (4) the 3D finite element model of the construction process of super-long anti-slide pile is established. The results of simulation calculation and monitoring data are compared and analyzed, and the influence of pile excavation on soil deformation and stress around pile is studied. Main findings: 1) the displacement of deep soil in Daping landslide is obtained by analyzing the monitoring data of inclined hole. At the same time, according to the peak displacement, the depth of the shallow and deep sliding surface of the landslide is 16 ~ 20 m and 36 ~ 40 m, respectively. 2) the shallow and deep sliding surfaces of the landslide are plotted by measuring the peak value of sliding displacement monitored by slanting holes. 3) the safety coefficient of landslide strengthened by anti-slide pile is increased from 0.8875 to 1.2125 by two-dimensional simulation. The maximum displacement at the foot of the slope was reduced from 71.27 cm to 5.59 cm. 4) the safety coefficient of landslide strengthened by anti-slide pile is increased from 0.9125 to 1.3225 through 3D simulation. The maximum displacement at the foot of the slope was reduced from 91.63 cm to 9.54 cm. 5) comparing and analyzing the monitoring data and numerical simulation data of the construction process of anti-slide pile, and combining with the variation of excavation depth of anti-slide pile. It is concluded that the stress and displacement of surrounding rock increase with the increase of excavation depth during the construction of anti-slide pile.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P642.22;U457.3

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