衢州市七里高边坡渗流影响稳定性分析
发布时间：2019-02-21 08:15
【摘要】：本文以杭新景高速公路沿线的七里连接线高边坡工程为研究对象,边坡线路的开挖以及初步的抗滑措施已基本完成,基于对地质勘察资料和稳定性监测数据的初步分析研究,利用Plaxis数值计算软件重点分析讨论连接线边坡在不同水力条件下应力应变及稳定性状态的变化趋势。主要研究工作与成果如下:(1)对深部位移监测数据作整理分析,结合现场地质条件、施工工序和大气环境,初步研究边坡的变形性质及成因:确定坡体变形范围,潜在滑动带大致位于侏罗系和奥陶系地层分界面的位置,位移在雨季线性增长,位移速率显示边坡呈推移式滑动变形特征,降雨对边坡变形的影响显著。(2)建立典型均质土坡的数值模型,对比稳态渗流场条件和非稳态渗流场条件下的计算结果,验证渗流及流固耦合作用对边坡稳定性分析影响的重要性。(3)依据现场水位和变形监测数据,确定分析时段,根据控制轴线的地质剖面图建立连接线边坡的数值模型,依次计算给定水力工况条件下边坡的应力应变及稳定性状态,包括初始稳态渗流场、抽水作用引起的水位下降、降雨等,计算结果分析表明:各工况下边坡的稳定性安全系数均高于1.30,处于稳定状态;下游局部水位短期内的快速下降对上游水位无明显影响,相反会产生范围较广的超静孔压,不利于边坡稳定性;因地下水位变化产生的位移变形前期快后期慢;降雨通过影响浅层土体内的饱和度和基质吸力降低了边坡稳定性的安全系数。
[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.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.14
，
本文编号：2427374
[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.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.14
，
本文编号：2427374
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