【摘要】：摘要：多年凍土區(qū)工程建筑物常遭受凍結(jié)土體所產(chǎn)生的水平凍脹力而被破壞,由此引起的凍害嚴(yán)重影響了建筑物的服役性能。本文通過對既有研究成果的收集,分析了水平凍脹力的形成機理和影響因素,并采用有限單元法計算了多年凍土區(qū)淺埋建筑物水平凍脹力的發(fā)展和分布規(guī)律,得出結(jié)論： (1)溫度、土質(zhì)、含水率對水平凍脹力有顯著性影響,且含水率的影響最為顯著,同時溫度、土質(zhì)、含水率對水平凍脹力具有明顯的交互影響作用。 (2)多年凍土區(qū)淺埋建筑物處于雙向凍結(jié)狀態(tài),其溫度場是由建筑物的埋深和結(jié)構(gòu)形式共同決定,且不同埋深和結(jié)構(gòu)形式的建筑物中部溫度場相互差異較大。 (3)對于剛度較大的淺埋建筑物,水平凍脹力上部最大,沿埋深有減小的趨勢,埋深1/3～1/2位置減小最劇烈,埋深中部達最小值。對于剛度較小的淺埋建筑物,水平凍脹力上部最小,沿埋深有增大的趨勢,中部達最大值。 (4)不同結(jié)構(gòu)形式淺埋建筑物的水平凍脹力沿埋深的分布形式基本一致,埋深中部數(shù)值差別較大,上部和底部數(shù)值相差較小。同種結(jié)構(gòu)形式不同埋深建筑物的水平凍脹力沿埋深的分布形式基本相同,埋深中部數(shù)值差別較大,上部和底部數(shù)值基本相同。 (5)水平凍脹力發(fā)展過程可分為四個階段,即形成階段-急速增長階段-緩慢增長階段-衰減階段。
[Abstract]:Abstract: engineering buildings in permafrost regions are often damaged by the horizontal frost heaving caused by frozen soil, which seriously affects the service performance of buildings. In this paper, the formation mechanism and influencing factors of horizontal frost heaving force are analyzed, and the development and distribution of horizontal frost heave force of shallow buried buildings in permafrost region are calculated by finite element method. The conclusions are as follows: (1) temperature, soil quality and moisture content have significant effects on horizontal frost heaving force, and the effect of water content is the most significant. Meanwhile, temperature, soil quality and moisture content have obvious interactive effects on horizontal frost heave force. (2) the shallow buried buildings in permafrost region are in the state of bidirectional freezing, and the temperature field is determined by the buried depth and the structure form of the building, and the temperature field in the middle of the building with different buried depth and structure form is quite different. (3) for shallow buried buildings with larger stiffness, the horizontal frost heave force is the largest in the upper part and decreases along the buried depth. The position of 1 / 3 / 1 / 2 of the buried depth decreases sharply and the middle part of the buried depth reaches the minimum value. For the shallow buried buildings with low stiffness, the horizontal frost heave force is the smallest in the upper part, increasing along the buried depth, and reaching the maximum in the middle part. (4) the distribution of horizontal frost heaving force along the buried depth of shallow buried buildings with different structural forms is basically the same, the value of the middle part of the buried depth is quite different, and the difference between the upper and bottom values is relatively small. The distribution of horizontal frost heaving force along the buried depth is basically the same with the same structure form and different buried depth. The value of the middle part of the buried depth is quite different, and the value of the upper part and the bottom is basically the same. (5) the development process of horizontal frost heaving force can be divided into four stages, that is, the formation stage, the rapid growth stage, the slow growth stage and the attenuation stage.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU445;TU311

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