抗滑桩和锚杆联合支护下边坡抗震性能振动台试验研究

发布时间：2018-11-10 19:04

【摘要】：为研究抗滑桩和锚杆联合支护下边坡的地震响应规律及破坏过程,开展了相应的振动台模型试验。通过输入三种不同地震波,不断增大地震波的峰值,得到了支挡结构的动应力分布规律及加固机理。试验表明:1坡体裂缝的产生对其加速度响应规律影响很大,在裂缝产生后,常规的响应规律将发生突变。2在高烈度地震波作用下,深层次的基岩也会受到一定程度的损伤破坏,深层的破坏可能使得对边坡失稳模式的常规设防(针对滑动面)变得失去意义。3在地震过程中,由于坡体向外滑动,同一锚杆的不同位置发挥最大抗力的时间具有先后顺序,靠近坡面的锚杆段首先达到最大值,依次为后面的自由段、锚固段。4在地震作用较小时,桩后动土压力近似成抛物线分布,桩前动土压力成矩形分布;随着地震作用的增大,靠近滑带处的桩前、桩后动土压力增长较快。试验结果为该支挡形式的抗震设计提供有益的参考。
[Abstract]:In order to study the seismic response and failure process of slope supported by anti-slide pile and bolt, the shaking table model test was carried out. Through the input of three different seismic waves, the peak value of the seismic wave is continuously increased, and the dynamic stress distribution law and reinforcement mechanism of the retaining structure are obtained. The test results show that: 1 the occurrence of cracks in slope body has a great influence on the acceleration response law, and after the cracks are produced, the conventional response law will mutate. 2 under the action of high intensity seismic wave, Deep bedrock will also be damaged and destroyed to a certain extent, and the deep failure may make the conventional fortification of slope instability mode (aimed at sliding surface) become meaningless. 3 during the earthquake, the slope body slips outwards. The time of exerting the maximum resistance at different positions of the same bolt has an order of order. The anchoring section near the slope first reaches the maximum value, followed by the free section, and the anchoring section. 4 is less active in the earthquake. The dynamic earth pressure at the back of the pile is approximately parabola distribution, and the dynamic earth pressure at the front of the pile is rectangular. With the increase of earthquake action, the dynamic earth pressure behind the pile increases rapidly in front of the pile near the slip zone. The experimental results provide a useful reference for the seismic design of the retaining form.
【作者单位】：后勤工程学院;岩土力学与地质环境保护重庆市重点试验室;重庆市地质灾害防治工程技术研究中心;重庆工业职业技术学院;中科院武汉岩土力学研究所;
【基金】：国家重点研究发展计划(973)(2011CB013600,2011CB710603) 国家自然科学基金(51378496) 重庆自然科学基金(cstc2013jcyjys0002,cstc2012jjys0001)
【分类号】：TU476;TU435

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