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滑坡与锚杆抗滑桩相互作用的大型物理模型试验研究
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摘要
作为一种新型的支挡结构物,锚索(杆)抗滑桩近年来在大中型滑坡治理工程中发挥了重要的作用,但由于其理论研究远远落后于工程实践,因而限制了其在工程实践中的推广应用。本文在国家自然科学基金和中国地调局国土资源大调查项目的资助下,开展了多种形式的锚杆抗滑桩的模型试验,对锚杆抗滑桩的受力、变形和破坏特征进行了多角度研究,给出了锚索(杆)拉力、桩身变形和内力的计算公式。本文的主要研究内容及成果如下:
     (1)分别开展了锚杆抗滑桩技术的室内模型试验、大比例尺物理模型试验和光弹试验,对锚杆抗滑桩技术在黄土滑坡治理中的应用进行了深入研究,为锚杆抗滑桩在滑坡灾害治理工程中的应用提供了新的依据。
     (2)研究了锚杆抗滑桩在滑坡推力作用下的变形特征和破坏机理,揭示了锚杆抗滑桩在土体滑坡中可能的三种破坏模式,即:桩体塑性铰破坏模式,锚杆失效模式和桩周土体的塑性失稳破坏模式。
     (3)通过对桩身前后土体压力对比分析,得出锚杆抗滑桩桩体压力的分布形式、数值大小、分布集度及与桩体嵌固深度的关系。
     (4)通过桩体钢筋上的应变分析,给出了锚杆抗滑桩桩体弯矩的分布图式。
     (5)通过多组试验,对于锚杆抗滑桩桩体的嵌固深度进行了研究,并给出了其合理的嵌固范围。
     (6)通过锚杆钢筋应变和钢筋计数值分析,揭示了多排锚杆的受力从上往下逐渐递增的规律,也即最下一排锚杆受力最大,分担了较多的滑坡推力,然后往上逐渐递减,并给出了其大致的比例关系。
     (7)通过光弹试验分析,认为在锚杆许可承受拉力范围内,其分担滑坡推力的比例随荷载的增加而增加,且分担比例与桩的嵌固深度关系较大,嵌固深度愈短,分担的比例愈大,反之愈小。另外,随着桩体刚度的提高,锚杆分担滑坡推力的比例相应减小。
     (8)对于单锚,在滑面附近锚杆一般会发生显著的剪切变形,导致自由段向下弯曲,而多锚这种现象不太明显。
     (9)对于普通抗滑桩和单锚抗滑桩,在滑体发生滑动时,在桩后滑面上下均出现一定范围内的脱空区,而多锚则不太明显。
     (10)对于设置在土体中的锚杆抗滑桩,其桩底可按自由支承边界条件来处理。
     (11)建立了锚索(杆)抗滑桩锚拉力的结构力学计算方法。
     (12)建议在土层滑坡中如果要设置抗滑桩,在有条件的情况下应当首选多锚抗滑桩,它不但可以极大的提高抗滑力,减少桩体内力和变形,还可使工程投资大为减小,施工难度相应降低。
As the important retaining structure, anchor anti-slide pile has played a very positive role in large and medium-sized landslide treatment project in recent years. However, its theoretical research lagged far behind the engineering practice leaded to sacrificing engineering investment in actual application process. The research achievements in this thesis are funded by the National Natural Science Funds and Land resources investigation projects of China geological survey. Various model tests on anchor anti-slide pile were carried out and the force, deformation and destruction of anchor anti-slide pile were studied from a number of angles. Based on the experimental studies, according to existed algorithm, tensile calculation formula of anchor is presented. The main research achievements in this thesis are as follows:
     (1) Photoelastic test on anchor anti-slide pile technology, small scale model test and large scale model test were carried out and the application of anchor anti-slide pile technology in loess landslide treatment project is studied deeply, which provides a basis for the application of anchor anti-slide pile in landslide disaster treatment engineering.
     (2)Deformation characteristics and failure mechanism of anchor anti-slide pile under the action of landslide thrust is studied and three possible failure modes of anchor anti-slide in soil landslide are revealed. They are pile plastic hinge damage, anchor failure and soil around the pile plastic failure.
     (3) Through analyzing the comparison of pressures, pressure distribution forms of anchor anti-slide piles in different conditions are obtained and their values, distribution collection degrees and the relations with embedded depth of piles are calculated.
     (4) Through analyzing strain of steel bar in anchor anti-slide piles,the distributions of bending moment and their values and distribution collection degrees are offered.
     (5) According to several tests, embedded depth of anchor anti-slide piles in different conditions are studied and their reasonable numerical range are pointed out.
     (6) According to the anchor reinforcement strain and numerical analysis of reinforcement meters, the force to rows of anchors gradually increases gradually from top to bottom. That is to say, the force to the lowest row of anchors is the largest and these anchors share more landslide thrust. Then the force from bottom to top gradually decreases and its proportional relations are deduced.
     (7) Through analyzing of the results of photoelastic test, with the increasing of load, the proportion of landslide thrust shared by anchor anti-slide piles increases within the scope of the bearable tension to anchor anti-slide pile and has an intently relations of embedded depth of the pile. The proportion is large if embedded depth is small and small if embedded depth is large. In addition, with the increasing of the stiffness of pile, the proportion of anchor tension to landslide thrust reduces accordingly.
     (8) For single anchor anti-slide pile, shearing deformation of anchor occurred near the sliding surface, which causes the fixed segment of the pile curved upward and the free segment curved down. For multi anchors anti-slide pile, this phenomenon is not obvious.
     (9) For ordinary anti-slide pile and single anchor anti-slide pile, there will exist disengaging area in certain range near the sliding surface when slope failure occurs. For multi anchors anti-slide pile, this obvious phenomenon can hardly be detected.
     (10) For anchor anti-slide pile placed in the soil, the pile foot can be designed by free bearing.
     (11) According to the results of model test and existed algorithm, structural mechanics calculation method of anchor tensile is calculated.
     (12) When setting up anti-slide piles in the soil slop, multi anchors anti-slide piles should be the first choice if condition permits. Multi anchors anti-slide piles can not only increase the sliding resistance greatly and reduce internal force and deformation of the piles, but also reduce the project investment greatly and decrease construction difficulty accordingly.
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