【作者】 张志耕；

【导师】 闫澍旺；

【作者基本信息】 天津大学 ， 岩土工程， 2007， 博士

【摘要】 公路在促进社会进步和保障经济发展中发挥着重要作用。公路的建设离不开两种关键技术问题的研究:软弱地基的处理和路基、边坡病害的整治。对于穿越高原湿地地区的高速公路而言,由于特殊环境气候条件的影响和地形地质条件的复杂性,这两个问题显得尤为突出。高原湿地地区的公路建设具有几个较为显著的特征:一是下部软基除了具有高含水量和低强度的特点外,另外一个突出特征是具有工程地质条件很差的泥炭层;另一方面,由于受地质构造和人为干扰的影响,特别容易诱发路基和边坡病害。本文根据高原湿地地区的主要地质特征,结合老集高速公路的建设,在现场试验和室内理论分析的基础上,探讨高原湿地地区的综合筑路技术,主要研究了如下几个方面的问题:1、结合高原湿地地区的水文地质特点,提出了碎石桩复合地基法处理湿地软基的基本思路。结合现场试验,采用有限元技术对碎石桩复合地基的工作机理进行了研究;2、对工程物探法在高速公路路基质量检测和病害原因调查中的作用进行探讨。研究了采用重力触探并结合工程物探对碎石桩质量进行快速检测的可行性,探讨了采用工程物探技术对高速公路路基质量和公路病害进行检测的科学性;3、膨胀土的工程性质较差,常是引起公路路堤、边坡病害的内因。研究了考虑吸力的情况下膨胀土边坡稳定性的分析方法;4、滑坡复活对公路路堤边坡病害具有重大影响。采用有限差分程序,探讨路堤加载导致滑坡复活的原因,并建议了相应的工程措施。研究结果显示,本文提出的高原湿地地区的综合筑路技术可以满足设计和施工要求,对于保证工程质量,加快施工进度提供了可行的技术保障。更多还原

【Abstract】 The highways play an important role in advancing society and economy development. The construction of highways relays on the research of two key techniques: soft foundation treatment and stabilization of side slope. For the highway through wetland on plateau, because of the effect of environmental climatic conditions and complexity of topography geologic features the two problems are special outstanding.There are several notable features for highway construction in wet-upland. The first, the soft foundation comprises peat bed, besides possesses characteristic of high water content and low strength. Secondly, because of the effects of geology structure and man-made disturb, the failures of bed road and side slope are easily induced.In this paper, based on the main geologic features of wet-upland area, combined with the construction of Lao-Ji highway and used field test and numerical analysis, the construction technique of highway in wet-upland is studied. These questions are researched as follows:1、Combined with the main geologic features in wet-upland area, composite foundation of gravel pile is used to improve soft foundation. Based on field test, the action mechanics of gravel pile foundation is studied by FEM;2、The effect of engineering geophysics on quality inspection and failure reason investigation of slope and bed road is studied. The feasibility of quick inspection of bed road quality using gravity sounding and engineering geophysics is researched;3、The engineering properties of expansive soil is poor, and its weakness is usually the internal reason for slope failure. Considered the suction effect, stability analysis method of expansive soil slope is studied;4、Reactivation of landslide give native effects on the slope stability. Used the FDM, the reason of landslide reactivation for embankment construction is studied.The results show that the construction techniques of highway in wet-upland area given by this paper can satisfy the demands of design and construction. They are beneficial for ensuring engineering quality and speeding construction progress.更多还原