【作者】 王丽；

【导师】 梁鸿；

【作者基本信息】 内蒙古农业大学 ， 森林工程， 2009， 硕士

【摘要】 随着我国高速公路的不断建设,高填深挖路基不断出现,故路基边坡稳定性问题变的日渐重要。路基边坡的稳定性由内因和外因决定,内因是边坡本身所固有的;外因主要包括降雨、地震等的影响。在这些外因中,降雨是导致路基边坡失稳的首要因素。本文针对含水率对非饱和土的影响进行了研究,主要分为两个部分:室内试验研究了含水率对非饱和土抗剪强度的影响;用计算机模拟了不同降雨强度、不同降雨持时对非饱和土路基边坡稳定性的影响。具体做了以下工作:1简述了非饱和土的一些基本理论。2通过室内试验研究了含水率对非饱和土抗剪强度和变形的影响。3根据已有文献对雨水入渗引发滑坡事件进行了分析及降雨类型的设计或选取。4根据基本渗流微分方程,建立了二维饱和—非饱和渗流计算模型5结合内蒙古呼和浩特地区降雨条件,通过GEO-SLOPE软件计算不同降雨强度、不同降雨持时对路基土质边坡稳定性的影响,并进行了边坡治理和治理后稳定性验算。更多还原

【Abstract】 With the abudent construction of expressway, more and more high filled and deep cut subgrade appearing constantly. So the stability of the subgrade slope is more and more important. The stability of the subgrade slope is determined by its internal and external factors. The inter factors are inherent and the external factors mainly include rainfall, earthquake and so on. In the many external factors, rainfall is the most important factor to bring about the slope failure.Aiming at the influence of water ratio to unsaturated soil to research, it mainly includes two parts. The one part is the interior experiments which reaearch the influence of water ratio to the shearing strength of unsaturated soil. The other part is to use computer to imitate, by means of imitating to research the influence of different rainfall strength and rainfall duration to slope stability of unsaturated soil. The main ratio is as follows:1 Illustrated theory of the unsaturated soil.2 Researched the influence of water ratio to the shearing strength and deformation of unsaturated soil by the interior experiments.3 Designed or choosed rainfall type by investigating and researching documents which have existed and according to documents analyzing rainfall infiltration to cause slide slope events.4 Based on the fundamental seepage equation, introuduced the differential equation of 2D saturated-unsaturated seepage, in which the pressure head is the fundamental unkown quantity. A calculated model for analysis seepage with rainfall infiltration boundary condition has set.5 Based on the actual rainfall condition in Hohhot of Inne-Mongolia, considering the different rainfall strength and duration, the stability of soil slopes are calculated by using the slope calculation software. The stability of slope is evaluated by reinforced slope in the situation of rainfall.更多还原