北部引嫩干渠边坡稳定分析与处理措施研究

发布时间：2018-02-13 17:29

本文关键词： 季节冻土区土质边坡冻胀稳定分析防护措施　出处：《清华大学》2014年硕士论文　论文类型：学位论文

【摘要】：黑龙江省北部引嫩干渠工程位于季节冻土区,渠道边坡不仅要经历夏季的雨水冲刷与侵蚀,在冬季,边坡还要承受冻融循环与冻胀破坏的影响。有些过水渠坡还要受到冰凌侵蚀与冰推破坏。周而复始的冻融循环对渠坡土体的强度与结构应力都是严峻的考验。这种复杂的自然环境决定了这一地区的渠道工程面临着多种形式的破坏。冻胀是破坏季节冻土区渠道工程的主要原因,也是该地区渠道工程首先要克服的工程难题。本文主要针对季节冻土区边坡失稳的问题,采用瑞典条分法和毕肖普法,对黑龙江省北部引嫩干渠典型断面进行稳定分析。对现场监测断面进行冻胀影响研究,分析水位线、温度场的变化趋势。针对典型断面,提出适合在季节冻土区应用的边坡防护措施,并选取防护措施进行室内模型试验研究,对模型试验的温度场、应力场、位移场进行分析。提出适用于季节冻土区边坡稳定分析的方法与防护结构措施,为季节冻土区渠道输水安全与维护提供技术支持与保障。通过北部引嫩干渠典型破坏断面的研究,得到如下结论:一、季节冻土区由于自然环境的复杂,土质边坡存在多种破坏类型。影响渠道的正常运行。二、对北部引嫩干渠边坡土样的室内土工试验、及冻胀特性试验的结果进行分析,得到影响季节冻土区土质边坡冻胀的主要因素有含水率、温度及土体本身的特性等,归纳总结了边坡失稳的主要影响因素。三、用瑞典条分法和毕肖普法对边坡进行稳定分析,计算结果与现场监测断面的滑弧变形基本一致。发现该边坡失稳破坏存在渗流的影响。即渠道水位线较高,有水向渠道内渗透,是导致边坡失稳的主要原因。四、总结不同结构形式边坡防护措施的应用特点,其中包括碎石聚氨酯护坡、雷诺垫护坡等,通过模型试验对防护措施的温度场、应力场、位移场进行分析,得到适用季节冻土区边坡稳定的结构形式。这种评价与计算季节冻土区边坡稳定的方法为今后渠道工程在季节冻土区的维护与运行提供参考借鉴的经验,为渠道工程的施工提供省时、省力、有效的可行方案。
[Abstract]:The main canal project in northern Heilongjiang Province is located in the seasonal frozen soil area. The canal slope not only has to undergo the erosion and erosion of Rain Water in summer, but also in winter. The slope is also affected by freeze-thaw cycle and frost heave failure. Some overwater channel slopes are also subjected to ice erosion and ice pushing damage. The repeated freezing and thawing cycles are severe tests on the strength and structural stress of the soil in the canal slope. The complicated natural environment determines that the channel engineering in this area is faced with many forms of destruction, and frost heaving is the main reason for the destruction of channel engineering in the seasonal frozen soil region. This paper mainly aims at the problem of slope instability in the seasonal frozen soil region, and adopts Swedish slice method and Bishop method. The stability analysis of typical section of Nen drainage canal in northern Heilongjiang Province is carried out. The frost heave effect of field monitoring section is studied, and the variation trend of water level and temperature field is analyzed. The slope protection measures suitable for application in the seasonal frozen soil region are put forward. The indoor model test is carried out by selecting the protective measures, and the temperature field and stress field of the model test are studied. The analysis of displacement field is carried out. The methods and protective measures for slope stability analysis in seasonal frozen soil region are put forward. This paper provides technical support and guarantee for the safety and maintenance of canal transportation in seasonal permafrost regions. Through the study of typical damaged sections of the Nen drainage channels in the north, the conclusions are as follows: first, the natural environment is complex in the seasonal frozen soil regions. There are many kinds of failure types of soil slope, which affect the normal operation of channel. Secondly, the results of indoor geotechnical test and frost heave characteristic test of soil sample on the slope of Nen drainage canal in the north of China are analyzed. The main factors affecting the frost heaving of soil slope in seasonal frozen soil region are obtained, such as moisture content, temperature and the characteristics of soil itself, and the main influencing factors of slope instability are summarized. Thirdly, the stability analysis of slope is carried out by using Swedish strip method and Bishop method. The calculated results are basically consistent with the sliding arc deformation of the monitoring section on the spot. It is found that seepage exists in the failure of the slope, that is, the high water level of the channel and the infiltration of water into the channel are the main reasons leading to the slope instability. This paper summarizes the application characteristics of slope protection measures of different structural forms, including gravel polyurethane slope protection, Renault cushion slope protection and so on. The temperature field, stress field and displacement field of the protection measures are analyzed by model test. The structural form of slope stability in seasonal frozen soil region is obtained. This method of evaluation and calculation of slope stability in seasonal frozen soil region provides reference experience for the maintenance and operation of canal engineering in seasonal frozen soil region in the future. To provide a time-saving, labor-saving, effective and feasible scheme for the construction of channel engineering.
【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV672;TV223

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