宝鸡地区黄土边坡地震响应对边坡参数的敏感性研究
发布时间：2018-11-03 12:27
【摘要】：近年黄土地区工程建设不同程度地涉及到黄土边坡,黄土边坡地震动力稳定性研究已成为当前的重要课题。边坡的物理力学参数和几何参数是影响边坡地震动力响应和地震稳定性的重要因素,由于测量技术方法和勘察工作量投入的限制,边坡的物性参数和几何参数很难取得确定值,那么参数取值必然有一定的合理浮动范围。本文以边坡物性参数和几何参数在一定的合理范围内变化为前提,研究这种参数浮动变化对边坡地震动力响应的影响,旨在揭示宝鸡地区黄土边坡地震动力响应对边坡物性参数和几何参数的敏感性规律及描述这种敏感性的定量指标,主要工作如下:(1)依据文献资料确定宝鸡黄土地区黄土的物理力学参数(密度、粘聚力、内摩擦角、杨氏模量、泊松比、阻尼比)取值的合理范围,并确定边坡土体物理力学参数浮动变化的合理范围。不考虑边坡勘查精度导致边坡几何参数的误差。(2)建立代表性边坡模型,基于正交设计法设计试验,结合极差分析法对试验组结果进行数据处理,用极差作为因素敏感性的定量指标,以垂直入射的简谐纵波激励边坡。在弱震激励下,分析密度、杨氏模量、泊松比、阻尼比、坡面凹凸程度5个因素对代表性边坡微震动力响应的影响,将边坡坡体的最大振动速度作为评价指标,得到各因素敏感性大小顺序:凹凸程度泊松比杨氏模量阻尼比密度。在强震作用下,分析杨氏模量、泊松比、阻尼比、坡面凹凸程度、内聚力、内摩擦角6个因素对代表性边坡强震动力响应的影响,将边坡的临界加速度作为评价指标,得到各因素敏感性大小顺序:内摩擦角阻尼比内聚力杨氏模量泊松比凹凸程度。(3)将中国陕西宝鸡蟠龙塬黄土边坡作为实例进行参数敏感性分析,采用与代表性边坡相同的试验和分析方法。得到弱震情况下,因素的敏感性大小顺序:泊松比杨氏模量阻尼比密度。强震情况下,因素的敏感性大小顺序:内摩擦角阻尼比内聚力杨氏模量密度泊松比。
[Abstract]:In recent years, engineering construction in loess area has been related to loess slope to varying degrees, and the study of seismic dynamic stability of loess slope has become an important subject at present. The physical and mechanical parameters and geometric parameters of the slope are the important factors that affect the seismic dynamic response and seismic stability of the slope. Due to the limitation of the technical methods of measurement and the input of the survey workload, it is difficult to obtain the definite values of the physical and geometric parameters of the slope. Then the parameter must have a reasonable floating range. In this paper, based on the variation of the slope physical and geometric parameters within a reasonable range, the influence of the variation of the parameters on the seismic dynamic response of the slope is studied. The purpose of this paper is to reveal the sensitivity of seismic dynamic response of loess slope in Baoji area to the physical and geometric parameters of the slope and to describe the quantitative index of the sensitivity. The main works are as follows: (1) the reasonable range of physical and mechanical parameters (density, cohesion, angle of internal friction, Young's modulus, Poisson's ratio, damping ratio) of loess in Baoji loess area is determined according to the literature data. The reasonable range of variation of physical and mechanical parameters of slope soil is determined. The error of the geometric parameters of the slope is not considered. (2) the representative slope model is established, the experiment is designed based on orthogonal design method, and the data of the test group is processed with the range analysis method. Using range as the quantitative index of factor sensitivity, the slope is excited by a simple harmonic longitudinal wave with vertical incidence. Under weak earthquake excitation, the effects of density, Young's modulus, Poisson's ratio, damping ratio and concavity and convex degree of slope on the dynamic response of representative slope are analyzed. The maximum vibration velocity of the slope body is taken as the evaluation index. The order of sensitivity of each factor is as follows: Poisson's modulus and damping ratio density of concave and convex degree. Under the action of strong earthquake, the influence of six factors, such as Young's modulus, Poisson's ratio, damping ratio, slope concavity degree, cohesion force and friction angle, on the dynamic response of representative slope to strong earthquake is analyzed. The critical acceleration of slope is regarded as the evaluation index. The order of sensitivity of each factor is obtained: internal friction angle damping ratio cohesion modulus Poisson's modulus concave and convex degree. (3) taking the loess slope in Panlong tableland of Baoji Shaanxi Province as an example the parameter sensitivity analysis is carried out. The test and analysis method is the same as the representative slope. In the case of weak earthquake, the order of sensitivity of the factors is: Poisson's ratio of Young's modulus to damping density. In the case of strong earthquakes, the order of sensitivity of the factors is as follows: damping ratio of internal friction angle, cohesion of Young's modulus density Poisson's ratio.
【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】：2015
【分类号】：TU435
本文编号：2307785
[Abstract]:In recent years, engineering construction in loess area has been related to loess slope to varying degrees, and the study of seismic dynamic stability of loess slope has become an important subject at present. The physical and mechanical parameters and geometric parameters of the slope are the important factors that affect the seismic dynamic response and seismic stability of the slope. Due to the limitation of the technical methods of measurement and the input of the survey workload, it is difficult to obtain the definite values of the physical and geometric parameters of the slope. Then the parameter must have a reasonable floating range. In this paper, based on the variation of the slope physical and geometric parameters within a reasonable range, the influence of the variation of the parameters on the seismic dynamic response of the slope is studied. The purpose of this paper is to reveal the sensitivity of seismic dynamic response of loess slope in Baoji area to the physical and geometric parameters of the slope and to describe the quantitative index of the sensitivity. The main works are as follows: (1) the reasonable range of physical and mechanical parameters (density, cohesion, angle of internal friction, Young's modulus, Poisson's ratio, damping ratio) of loess in Baoji loess area is determined according to the literature data. The reasonable range of variation of physical and mechanical parameters of slope soil is determined. The error of the geometric parameters of the slope is not considered. (2) the representative slope model is established, the experiment is designed based on orthogonal design method, and the data of the test group is processed with the range analysis method. Using range as the quantitative index of factor sensitivity, the slope is excited by a simple harmonic longitudinal wave with vertical incidence. Under weak earthquake excitation, the effects of density, Young's modulus, Poisson's ratio, damping ratio and concavity and convex degree of slope on the dynamic response of representative slope are analyzed. The maximum vibration velocity of the slope body is taken as the evaluation index. The order of sensitivity of each factor is as follows: Poisson's modulus and damping ratio density of concave and convex degree. Under the action of strong earthquake, the influence of six factors, such as Young's modulus, Poisson's ratio, damping ratio, slope concavity degree, cohesion force and friction angle, on the dynamic response of representative slope to strong earthquake is analyzed. The critical acceleration of slope is regarded as the evaluation index. The order of sensitivity of each factor is obtained: internal friction angle damping ratio cohesion modulus Poisson's modulus concave and convex degree. (3) taking the loess slope in Panlong tableland of Baoji Shaanxi Province as an example the parameter sensitivity analysis is carried out. The test and analysis method is the same as the representative slope. In the case of weak earthquake, the order of sensitivity of the factors is: Poisson's ratio of Young's modulus to damping density. In the case of strong earthquakes, the order of sensitivity of the factors is as follows: damping ratio of internal friction angle, cohesion of Young's modulus density Poisson's ratio.
【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】：2015
【分类号】：TU435
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