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首页> 外文会议>Geotechnical Special Publication no.129; Geo-Frontiers Conference; 20050124-26; Austin,TX(US) >Response of Tension Piles to Simulated Seismic Motion in Saturated Fine Sand
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Response of Tension Piles to Simulated Seismic Motion in Saturated Fine Sand

机译：饱和细砂中张力桩对模拟地震运动的响应

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摘要

A laboratory model study of tension piles subjected to simulated seismic loading through the soil was conducted. The objective of the study was to assess the magnitude of biased (static) tension load that can be sustained by displacement-type piles driven into medium dense, saturated fine sand during seismic events typical of those in Southern California. The prototype pile characteristics modeled in this study consisted of a closed-end, or plugged, impact-driven pipe pile, 20 to 40 in. in diameter, 20 to 40 ft long (or top 20 to 40 ft of a longer pile). An acceleration record for a particular magnitude 5.8 seismic event, the Oceanside, California, earthquake of July 13, 1986, measured at an offshore deep soil site 45 mi (74 km) from the epicenter, was selected and scaled to higher magnitudes to simulate more severe earthquake loading conditions on the pile. A 21-in.-high by 20-in.-diameter pressure chamber was used to contain the saturated soil and to simulate isotropic effective stresses and drainage conditions. The model test pile was an instrumented, steel, closed-end tube, 1 in. in diameter and 16 in. long, that was loaded through a spring-mass system to simulate feedback from a simple superstructure with a known natural period. Pile-head movements, pile load versus depth, and pore water pressures in the soil were measured during the experiments. Both the simulated seismic record and soil permeability were scaled to model the effect of drainage distance and its effect on pore water pressure generation and dissipation. Contour plots of stability conditions (sustained tension resistance and small pile movements), mobility conditions (sustained resistance associated with substantial pile movements), and failure conditions (total loss of pile capacity) for the model pile were developed from the tests. The effect of distance between the pile and event epicenter on stability was considered analytically.
机译：进行了通过模拟地震荷载作用在土壤中的张力桩的室内模型研究。这项研究的目的是评估在南加州典型的地震事件中，将位移型桩打入中等密度的饱和细砂中所能承受的偏置（静态）拉力负荷的大小。在本研究中建模的原型桩特性包括直径为20至40英寸，长度为20至40英尺（或更长桩的顶部为20至40英尺）的封闭端或堵塞的冲击驱动管桩。选择了特定震级5.8级地震的加速度记录，即1986年7月13日在加利福尼亚州欧申赛德地震，该震源在距震中45英里（74公里）处的一个深海土壤现场测得，并按比例放大到更高的震级，以模拟更多桩上的严重地震荷载条件。使用21英寸高乘20英寸直径的压力室来容纳饱和土壤，并模拟各向同性有效应力和排水条件。模型测试桩是一种仪器化的，直径1英寸，长16英寸的封闭端钢管，通过弹簧质量系统加载，以模拟来自具有已知自然周期的简单上部结构的反馈。在实验过程中测量桩头运动，桩载荷与深度的关系以及土壤中的孔隙水压力。模拟地震记录和土壤渗透率均按比例绘制，以模拟排水距离的影响及其对孔隙水压力产生和消散的影响。从测试中得出了模型桩的稳定条件（持续的抗拉强度和小桩运动），流动性条件（与大的桩运动相关的持续阻力）和破坏条件（桩的总损失能力）的等高线图。从分析上考虑桩与事件震中之间的距离对稳定性的影响。

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