极端降雨条件下土质边坡稳定性分析与处置措施研究

发布时间：2018-03-20 15:06

本文选题：土-水特征曲线　切入点：降雨入渗　出处：《浙江海洋大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国南方地区处于亚热带和热带季风气候,具有雨季长,雨量大等气候特点,降雨是导致滑坡自然灾害的最大诱因,雨水的入渗会增加边坡土体重度,造成岩土体软化,弱化其抗剪强度,增加边坡失稳的风险。边坡排水措施是边坡稳定性的保障,而鉴于目前边坡排水措施多种多样却又存在各种缺陷和限制的窘况,研究更具有实用性和高效性的边坡排水措施就成了当前急需解决的重要工程问题。这一问题也是众多岩土专家学者们一直以来关注的热点。为了对这一问题进行研究,本文做了以下几个方面的工作:首先以浙江省衢州市某高速公路边坡项目为研究对象,进行实地考察并采集工程现场土样,通过室内张力计与土壤含水量测定仪联合试验获取了土样的土-水特征曲线,并运用ChildsCollis-Geroge数学模型计算得出土样渗透系数函数曲线,分析了土样的特性。接着在获取土样参数的基础上,基于饱和-非饱和土理论,运用Geo-Studio有限元软件建立边坡模型,在所建边坡模型内部设置虹吸边坡排水系统,分析其提高边坡稳定性的效果,并就虹吸点布设位置以及虹吸点数量对提升边坡稳定性的效果影响进行了研究,结果发现虹吸边坡排水系统对边坡稳定性的提高具有明显效果,并且虹吸点位置无论在水平还是竖直方向上设置,其排水效果与虹吸点设置深度并非呈现出线性关系,且可确定最佳位置;相对于单个虹吸点来说,虹吸点数量越多排水效果越好,但是,虹吸点数量超过一定值后,数量的改变对排水效果影响作用会下降。最后结合实际边坡工程介绍了虹吸边坡排水系统的设计方案和施工流程,用实际工程效果有力的证明了虹吸边坡排水系统的实用性和高效性,并对工程应用提出了实用性的建议。
[Abstract]:Southern China is in the subtropical and tropical monsoon climate, with the characteristics of long rainy season, heavy rainfall and so on. Rainfall is the biggest inducement of landslide natural disasters. The infiltration of Rain Water will increase the severity of slope soil and cause the softening of rock and soil. Weakening its shear strength and increasing the risk of slope instability. Slope drainage measures are the guarantee of slope stability, but in view of the variety of slope drainage measures, there are various defects and limitations. The study of more practical and efficient slope drainage measures has become an important engineering problem that needs to be solved at present. This problem is also a hot topic that many geotechnical experts and scholars have been paying close attention to all along. In order to study this problem, This paper has done the following work: firstly, taking a highway slope project in Quzhou City, Zhejiang Province as the research object, the field investigation is carried out and the soil samples are collected on the spot. The soil-water characteristic curve of the soil sample was obtained by using the laboratory tensometer and the soil moisture content tester, and the permeability coefficient function curve of the soil sample was calculated by using the ChildsCollis-Geroge mathematical model. Based on the theory of saturated-unsaturated soil, the slope model is established by using Geo-Studio finite element software, and the siphon slope drainage system is set up inside the model. The effect of improving slope stability is analyzed, and the effect of siphon location and number of siphon points on slope stability is studied. The results show that siphon slope drainage system has obvious effect on slope stability improvement. And the siphon point position is not linear with the siphon point setting depth, regardless of the horizontal or vertical position, and the best position can be determined, compared with the single siphon point, The more the number of siphon points, the better the drainage effect. However, when the number of siphon points exceeds a certain value, The effect of quantity change on drainage effect will decrease. Finally, the design scheme and construction process of siphon slope drainage system are introduced in combination with actual slope engineering. The practicability and efficiency of siphon slope drainage system are proved by the practical engineering effect, and some practical suggestions for engineering application are put forward.
【学位授予单位】：浙江海洋大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.14

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