【摘要】：本文以杭新景高速公路沿線的七里連接線高邊坡工程為研究對(duì)象,邊坡線路的開(kāi)挖以及初步的抗滑措施已基本完成,基于對(duì)地質(zhì)勘察資料和穩(wěn)定性監(jiān)測(cè)數(shù)據(jù)的初步分析研究,利用Plaxis數(shù)值計(jì)算軟件重點(diǎn)分析討論連接線邊坡在不同水力條件下應(yīng)力應(yīng)變及穩(wěn)定性狀態(tài)的變化趨勢(shì)。主要研究工作與成果如下:(1)對(duì)深部位移監(jiān)測(cè)數(shù)據(jù)作整理分析,結(jié)合現(xiàn)場(chǎng)地質(zhì)條件、施工工序和大氣環(huán)境,初步研究邊坡的變形性質(zhì)及成因:確定坡體變形范圍,潛在滑動(dòng)帶大致位于侏羅系和奧陶系地層分界面的位置,位移在雨季線性增長(zhǎng),位移速率顯示邊坡呈推移式滑動(dòng)變形特征,降雨對(duì)邊坡變形的影響顯著。(2)建立典型均質(zhì)土坡的數(shù)值模型,對(duì)比穩(wěn)態(tài)滲流場(chǎng)條件和非穩(wěn)態(tài)滲流場(chǎng)條件下的計(jì)算結(jié)果,驗(yàn)證滲流及流固耦合作用對(duì)邊坡穩(wěn)定性分析影響的重要性。(3)依據(jù)現(xiàn)場(chǎng)水位和變形監(jiān)測(cè)數(shù)據(jù),確定分析時(shí)段,根據(jù)控制軸線的地質(zhì)剖面圖建立連接線邊坡的數(shù)值模型,依次計(jì)算給定水力工況條件下邊坡的應(yīng)力應(yīng)變及穩(wěn)定性狀態(tài),包括初始穩(wěn)態(tài)滲流場(chǎng)、抽水作用引起的水位下降、降雨等,計(jì)算結(jié)果分析表明:各工況下邊坡的穩(wěn)定性安全系數(shù)均高于1.30,處于穩(wěn)定狀態(tài);下游局部水位短期內(nèi)的快速下降對(duì)上游水位無(wú)明顯影響,相反會(huì)產(chǎn)生范圍較廣的超靜孔壓,不利于邊坡穩(wěn)定性;因地下水位變化產(chǎn)生的位移變形前期快后期慢;降雨通過(guò)影響淺層土體內(nèi)的飽和度和基質(zhì)吸力降低了邊坡穩(wěn)定性的安全系數(shù)。
[Abstract]:This paper takes the high slope engineering of Qili connecting line along Hangzhou Xinjing Expressway as the research object. The excavation of slope line and the preliminary anti-slide measures have been basically completed. Based on the preliminary analysis and study of geological survey data and stability monitoring data, The variation trend of stress strain and stability of connecting line slope under different hydraulic conditions is analyzed and discussed by using Plaxis numerical calculation software. The main research work and results are as follows: (1) the monitoring data of deep displacement are analyzed, combined with the field geological conditions, construction process and atmospheric environment, the deformation properties and causes of slope are studied preliminarily: the deformation range of slope body is determined. The potential slip zone is approximately located at the boundary of the Jurassic and Ordovician strata, and the displacement increases linearly during the rainy season. The effect of rainfall on slope deformation is significant. (2) the numerical model of typical homogeneous soil slope is established, and the calculated results of steady seepage field and unsteady seepage field are compared. The importance of seepage and fluid-structure coupling on slope stability analysis is verified. (3) according to the monitoring data of water level and deformation, the analysis period is determined, and the numerical model of connecting line slope is established according to the geological profile of the control axis. The stress strain and stability of the slope under given hydraulic conditions are calculated in turn, including the initial steady seepage field, the drop of water level caused by pumping, the rainfall, etc. The calculation results show that the safety factor of slope stability is higher than 1.30 under each working condition, and the slope is in a stable state. The rapid decline of the local water level in the downstream has no obvious effect on the upstream water level, on the contrary, it will produce a wide range of excess pore pressure, which is not conducive to the slope stability, and the displacement deformation caused by the change of the groundwater level will be slow in the early and late stages. Rainfall reduces the safety factor of slope stability by affecting the saturation and matrix suction in shallow soil.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U416.14
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本文編號(hào)：2427374