冠梁约束型抗滑桩与普通抗滑桩的抗震性能对比试验研究  

Research on Seismic Capacity Correlative Experiment of Top Beam Binding Anti-slide Pile and Common Anti-slide Pile

作　　者：艾挥 吴红刚 冯文强 陈小云[2,3] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中铁西北科学研究院有限公司,甘肃兰州730000 [3]中国铁道科学研究院研究生部,北京100081

出　　处：《防灾减灾工程学报》2017年第2期194-200,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51178402);甘肃省自然科学基金项目(145RJZA068);青海省交通建设科研项目(2010-03)资助

摘　　要：为了研究冠梁约束型抗滑桩在振动作用下的抗震性能,以大型振动台试验为手段,对比研究了冠梁约束型抗滑桩和普通抗滑桩在不同El地震波作用下的动力响应,结果表明:(1)随着El波加速度峰值的不断增大,抗滑桩桩身放大系数增大及桩身动土压力随之增大。(2)由于冠梁的作用,使得冠梁约束型抗滑桩联合成整体受力,改变了抗滑桩结构的受力条件。(3)X向加载时,冠梁约束型抗滑桩桩顶放大系数相对于普通抗滑桩较大;Z向加载时,恰好相反;双向加载时,其桩顶放大系数的差值与峰值加速度相关。(4)随着振动的加剧,在基岩接触面可能产生新的剪切滑移线。(5)在振动作用下,El地震波峰值加速度不超过1.2g时,冠梁约束型抗滑桩抗震性能相对较好。该试验可为震区抗震设计提供参考。In order to study the seismic performance of pile top combined beam structure under vibration, with large shaking table test as a means, we compare and study the dynamic response of anti slide pile with pile top and coupling beam and ordinary anti-slide pile under different E1 Cen- tro seismic ground motion, and draw the following conclusions： （1） With the increase of the peak value of E1 Centro ground motion, the anti-slide pile side amplification coefficient and the pile side earth pressure constantly increase. （2） Due to the effect of the crown beam, the force condition of anti-slide pile structure is changed. （3） Under the action of vibration in X direction, the ampli- fication coefficient at the top of anti-slide pile with crown beam is larger than that of the top of ordinary anti-slide pile; Under the action of vibration in Z direction, there is a contrary result Under the action of vibration in XZ direction, the difference of the amplification factor of the different kinds of piles top is related to the peak acceleration. （4） With the increase of vibration, a new shear slip line may be produced in the bedroek surface. （5） Under the action of vibration, when the E1 Centro seismic peak acceleration is not more than 1.2g, the seismic performance of the constrained anti-slide pile is relatively better. This experiment can provide a reference for design of anti-seismic structure.

关 键 词：动力响应 振动台试验 抗滑桩 

分 类 号：TU47[建筑科学—结构工程] P315.9[建筑科学—土工工程]