【作者】 温世亿；

【导师】 周宜红； 李建林；

【作者基本信息】 武汉大学 ， 水工结构工程， 2010， 博士

【摘要】 膨胀土对工程建设存在不利影响的同时也是地质灾害的重要诱因之一,由于其危害性大,造成的工程问题突出,因此对膨胀土的研究处理成为工程和工程地质领域的全球性技术难题。南水北调中线工程是国家的重要决策,该工程线路长1432km,穿越膨胀岩土渠段累计长约340km,论文结合南水北调中线工程特性,对膨胀土分类、工程特性、渠坡破坏机理和处理措施等关键技术问题进行研究具有重要的理论意义和实际意义。论文首先对国内外膨胀土的物理力学特性、渠坡破坏机理和防治技术研究进行了系统的总结与回顾,对中线工程典型膨胀土(岩)取样进行物理力学、胀缩、渗透和大气影响等工程特性试验分析；然后针对目前膨胀土分类体系存在的不足,建立了一个新的膨胀土多指标定量分类体系,并对南水北调中线工程膨胀土进行了判别划分；针对以往膨胀土边坡稳定性分析的不足提出了考虑膨胀特性的膨胀土边坡流固耦合分析方法,对膨胀土渠坡处理措施进行了室内试验研究和现场试验研究,提出了南水北调中线工程膨胀土(岩)渠坡处理推荐方案,为中线工程的顺利建设提供了技术支撑。具体内容如下：第二章对南水北调中线工程典型膨胀土(岩)进行取样,对其基本工程特性进行了试验研究,重点研究了原状样与重塑样的胀缩特性、渗透特性,对膨胀土(岩)的大气影响深度进行了研究。第三章针对目前膨胀土分类体系存在的不足,引入粗糙集理论对膨胀土分类采用的多项指标进行重要性分析,建立了一个新的膨胀土多指标定量分类体系并应用。第四章研究膨胀土(岩)渠坡破坏机理,通过大量的现场试验初步揭示了膨胀土渠坡的破坏模式,提出考虑膨胀特性的膨胀土流固耦合分析方法,运用有限元强度折减法计算渠坡安全系数,通过室内大型模型试验和现场降雨试验对该方法进行了验证。第五章对膨胀土(岩)渠坡工程处理措施进行了试验研究,包括室内试验研究和现场试验研究两个部分,对各种处理措施的作用和应用效果进行了综合评价,提出了南水北调中线工程膨胀土(岩)渠坡处理推荐方案。第六章为结论与展望。更多还原

【Abstract】 The expansive soil has much effect on the project, and is also one of important causes of the geological hazard. Since it made a lot of great damage and project problems, the research and treatment of the expansive soil has become global technical problems in engineering and engineering geology. As a important decisions project of China, the South-to-North Water Diversion Middle Route Project (denotes Middle Route Project in the following) has 1432 km long, in which about 340 km long areas are expansive rock and soil slopes. Based on the engineering characteristics of South-to-North Water Diversion project, the research on several key technical problems of expansive soil Canal Slopes, such as classification, engineering characteristics, failure mechanism, treatment measures and so on, has important theoretical meaning and practical significance. In this paper, the current research situation on expansive soil’s physical and mechanical characteristics, failure mechanism of canal slopes and treatment ways are summarized firstly. and gained the classification results of expansive soils in Middle Route Project. Secondly, according to the limitation of current classification approach, a new multi-indexes classification system on expansive soils has developed, Then the laboratory test and in-situ test on physical mechanical, swell-shrinking, permeability and atmospheric effects of expansive soils carried out, and fluid-solid coupling analysis method, which involved swelling behavior, and treatment measures of canal slopes of Middle Route Project construction developed. The main research contents and results include:In chapter 2, experimental study on the typical expansive rock and soil sampling’s engineering properties investigated. Atmospheric effect depth comparative analysis of expansive soil’s swell-shrink characteristics and seepage properties between undisturbed sample and remodeling sample has made.In chapter 3, based on the rough Set theory, important analysis of expansive soils classification indexes carried out, and developed a new multi-indexes classification system, according to the disadvantages of current classification methods.In chapter 4, the failure mechanism of expansive soils canal slopes studied, and revealed the failure mode by in-situ test, developed the fluid-solid coupling analysis method, which involved swelling behavior, calculated the safety factor by strength reduction finite element method. The validity of new method is testified by large indoor model test and field test.In chapter 5, the treatment measures of expansive soil canal slopes are studied roundly by indoor-test and field-test. The comprehensive evaluation on engineering effect of these methods has made. Finally, the treatment schemes to expansive soil canal slopes in South-to-North Water Diversion project put forward.Conclusions and prospects are put in Chapter 6.更多还原