【摘要】：近年黃土地區(qū)工程建設(shè)不同程度地涉及到黃土邊坡,黃土邊坡地震動(dòng)力穩(wěn)定性研究已成為當(dāng)前的重要課題。邊坡的物理力學(xué)參數(shù)和幾何參數(shù)是影響邊坡地震動(dòng)力響應(yīng)和地震穩(wěn)定性的重要因素,由于測(cè)量技術(shù)方法和勘察工作量投入的限制,邊坡的物性參數(shù)和幾何參數(shù)很難取得確定值,那么參數(shù)取值必然有一定的合理浮動(dòng)范圍。本文以邊坡物性參數(shù)和幾何參數(shù)在一定的合理范圍內(nèi)變化為前提,研究這種參數(shù)浮動(dòng)變化對(duì)邊坡地震動(dòng)力響應(yīng)的影響,旨在揭示寶雞地區(qū)黃土邊坡地震動(dòng)力響應(yīng)對(duì)邊坡物性參數(shù)和幾何參數(shù)的敏感性規(guī)律及描述這種敏感性的定量指標(biāo),主要工作如下:(1)依據(jù)文獻(xiàn)資料確定寶雞黃土地區(qū)黃土的物理力學(xué)參數(shù)(密度、粘聚力、內(nèi)摩擦角、楊氏模量、泊松比、阻尼比)取值的合理范圍,并確定邊坡土體物理力學(xué)參數(shù)浮動(dòng)變化的合理范圍。不考慮邊坡勘查精度導(dǎo)致邊坡幾何參數(shù)的誤差。(2)建立代表性邊坡模型,基于正交設(shè)計(jì)法設(shè)計(jì)試驗(yàn),結(jié)合極差分析法對(duì)試驗(yàn)組結(jié)果進(jìn)行數(shù)據(jù)處理,用極差作為因素敏感性的定量指標(biāo),以垂直入射的簡(jiǎn)諧縱波激勵(lì)邊坡。在弱震激勵(lì)下,分析密度、楊氏模量、泊松比、阻尼比、坡面凹凸程度5個(gè)因素對(duì)代表性邊坡微震動(dòng)力響應(yīng)的影響,將邊坡坡體的最大振動(dòng)速度作為評(píng)價(jià)指標(biāo),得到各因素敏感性大小順序:凹凸程度泊松比楊氏模量阻尼比密度。在強(qiáng)震作用下,分析楊氏模量、泊松比、阻尼比、坡面凹凸程度、內(nèi)聚力、內(nèi)摩擦角6個(gè)因素對(duì)代表性邊坡強(qiáng)震動(dòng)力響應(yīng)的影響,將邊坡的臨界加速度作為評(píng)價(jià)指標(biāo),得到各因素敏感性大小順序:內(nèi)摩擦角阻尼比內(nèi)聚力楊氏模量泊松比凹凸程度。(3)將中國(guó)陜西寶雞蟠龍塬黃土邊坡作為實(shí)例進(jìn)行參數(shù)敏感性分析,采用與代表性邊坡相同的試驗(yàn)和分析方法。得到弱震情況下,因素的敏感性大小順序:泊松比楊氏模量阻尼比密度。強(qiáng)震情況下,因素的敏感性大小順序:內(nèi)摩擦角阻尼比內(nèi)聚力楊氏模量密度泊松比。
[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.
【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】：2015
【分類號(hào)】：TU435

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本文編號(hào)：2307785