本文選題：格柵 + 加筋土擋墻��； 參考：《浙江大學(xué)》2014年博士論文

【摘要】：加筋土擋墻的破裂面、格柵拉力、土壓力、變形對(duì)加筋土擋墻的設(shè)計(jì)非常重要,但目前設(shè)計(jì)很多都是靠經(jīng)驗(yàn)。本文通過(guò)理論分析、數(shù)值模擬、模型實(shí)驗(yàn)、現(xiàn)場(chǎng)實(shí)驗(yàn)對(duì)格柵加筋土擋墻進(jìn)行了研究。研究發(fā)現(xiàn)：加筋土擋墻破裂面由向上應(yīng)力和向下應(yīng)力產(chǎn)生并疊加而成,向上應(yīng)力產(chǎn)生的破裂面一般由上下兩段直線構(gòu)成,破裂面的下半段從墻腳處斜向上方延伸,其與水平面的夾角呈45°+0.5φ,破裂面與豎向壓力呈線性關(guān)系,豎向壓力越大,破裂面越長(zhǎng)。墻頂壓力越大,破裂面的上半段位置越高,其從下半段的上端開始斜向墻面延伸。向下應(yīng)力產(chǎn)生的破裂面是一條產(chǎn)生于墻面某個(gè)位置并斜向下方延伸的直線,它與水平面的夾角也呈45°+0.5φ。本文總結(jié)出一套計(jì)算、快速繪制破裂面的方法。加筋土擋墻墻背處的側(cè)向土壓力與理論計(jì)算的靜止土壓力基本一致,可以用墻背處的靜止土壓力進(jìn)行擋墻的整體穩(wěn)定性驗(yàn)算。但是強(qiáng)夯后墻背處的側(cè)向土壓力顯著增大。由于格柵在加筋土中所起的作用逐漸變小,破裂面由下而上與水平面的夾角逐漸減小。同等條件下與直立加筋土擋墻相比,斜面加筋土擋墻的墻面位移和墻頂面的不均勻下沉都較小。擋墻的地基對(duì)擋墻墻面水平位移和墻頂面的不均勻下沉影響很大。斜面擋墻墻腳處的破裂面隨墻面的傾斜而傾斜。三分之一墻高處的墻面水平位移最大,出現(xiàn)“鼓肚”現(xiàn)象,隨著墻頂荷載的增大,墻面水平位移增大,上部墻面的水平位移更顯著。在擋墻旁強(qiáng)夯會(huì)引起墻面較大的振動(dòng)加速度,尤其是墻面頂點(diǎn)的水平加速度。夯點(diǎn)距墻面越近,振動(dòng)加速度顯著增大。強(qiáng)夯會(huì)引起格柵拉力增大,重錘低擊可減少?gòu)?qiáng)夯對(duì)格柵的影響。碾壓荷載會(huì)使中下部墻面發(fā)生較大的水平位移,而強(qiáng)夯會(huì)使碾壓而成的加筋土擋墻墻面“回縮”。本文的理論、實(shí)驗(yàn)方法、結(jié)論可為進(jìn)一步研究和擋墻設(shè)計(jì)提供參考。
[Abstract]:The fracture surface, grid tension, earth pressure and deformation of reinforced earth retaining wall are very important to the design of reinforced earth retaining wall. In this paper, theoretical analysis, numerical simulation, model experiment and field experiment are used to study the reinforced earth retaining wall. It is found that the rupture surface of reinforced earth retaining wall is produced and superimposed by the upward stress and the downward stress. The rupture surface produced by the upward stress is generally composed of two straight lines, and the lower half of the fracture surface extends diagonally from the bottom of the wall to the top. The angle between the plane and the horizontal plane is 45 擄0.5 蠁, and the fracture surface is linearly related to the vertical pressure. The larger the vertical pressure is, the longer the fracture surface is. The higher the pressure on the top of the wall is, the higher the position of the upper half of the rupture surface is, and the higher the upper end of the lower part is, the more inclined it is to the wall. The fracture surface produced by downward stress is a straight line which originates from a certain position of the wall and extends diagonally downwards. The angle between it and the horizontal plane is also 45 擄0.5 蠁. In this paper, a set of calculation methods for fast drawing of fracture surface is summarized. The lateral earth pressure at the back of the reinforced earth retaining wall is basically consistent with the static earth pressure calculated theoretically, and the overall stability of the retaining wall can be checked by the static earth pressure at the back of the wall. However, the lateral earth pressure at the back of the wall increases significantly after dynamic compaction. The angle between the fracture surface and the horizontal plane from the bottom to the top decreases gradually because the grid plays a smaller role in the reinforced soil. Compared with the vertical reinforced earth retaining wall under the same conditions, the wall displacement and the uneven subsidence of the top surface of the inclined reinforced earth retaining wall are smaller than those of the vertical reinforced earth retaining wall. The foundation of the retaining wall has great influence on the horizontal displacement of the wall surface and the uneven subsidence of the top surface of the wall. The cracked face at the foot of a inclined retaining wall tilts with the slope of the wall. The horizontal displacement of the wall at the height of 1/3 wall is the largest and the phenomenon of "bulging belly" appears. With the increase of the load on the top of the wall, the horizontal displacement of the wall surface increases, and the horizontal displacement of the upper wall is more obvious. Dynamic compaction next to the retaining wall will cause the vibration acceleration of the wall, especially the horizontal acceleration at the top of the wall. The closer the tamping point to the wall, the greater the vibration acceleration. Dynamic compaction will increase the grid tension, and the low impact of heavy hammer can reduce the influence of dynamic compaction on grid. The rolling load will make the middle and lower part of the wall face larger horizontal displacement, and the dynamic compaction will make the reinforced earth retaining wall surface "shrink". The theory, experimental method and conclusion of this paper can provide reference for further research and design of retaining wall.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU476.4

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