| 水平偏心受荷群桩p乘子计算 |
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| 引用本文： | 孔令刚,肖方初,樊继营,陈云敏.水平偏心受荷群桩p乘子计算[J].岩土力学,2019,40(12):4659-4667. |
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| 作者姓名： | 孔令刚 肖方初 樊继营 陈云敏 |
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| 作者单位： | 1. 浙江大学 岩土工程研究所，浙江 杭州 310058；2. 浙江大学 软弱土与环境土工教育部重点实验室，浙江 杭州 310058；
3. 女王大学 土木工程学院，安大略 金斯顿 |
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| 基金项目： | 国家自然科学基金（No.50809060，No.51579218） |
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| 摘 要： | 水平偏心受荷群桩同时发生水平移动和绕承台中心的转动，使基桩的运动方向各不相同，因此基桩的运动方向成为影响群桩效应的一个关键因素。研究发现：水平偏心受荷的两根桩，前桩运动方向与两桩连线夹角0o≤η≤90o，后桩夹角?90o≤θ≤90o；量化两桩间桩?土?桩相互作用的折减系数与η和θ密切相关，η和θ组合存在一个范围，在该范围内两桩不存在相互作用；当两桩存在相互作用时，相互作用对后桩的影响往往大于对前桩的影响。通过将定量描述水平受荷群桩群桩效应的p乘子概念拓展到水平偏心受荷群桩，综合运用理论分析、试验和数值计算成果，提出了折减系数计算公式，进而给出了广义p乘子经验计算公式。通过试验案例验证了该计算公式的合理性。
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| 关 键 词： | 水平偏心受荷 群桩效应 p乘子 折减系数 |
| 收稿时间： | 2018-09-27 |
p-multiplier for pile groups subjected to eccentric lateral loading |
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| KONG Ling-gang,XIAO Fang-chu,FAN Ji-ying,CHEN Yun-min.p-multiplier for pile groups subjected to eccentric lateral loading[J].Rock and Soil Mechanics,2019,40(12):4659-4667. |
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| Authors: | KONG Ling-gang XIAO Fang-chu FAN Ji-ying CHEN Yun-min |
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| Institution: | 1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China;
2. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou, Zhejiang 310058, China;
3. Department of Civil Engineering, Queen's University, Kingston, Ontario, Canada |
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| Abstract: | Lateral and torsional movements of the pile group caused by eccentric lateral loading, which would lead to different movement directions of the foundation piles. Therefore, the movement directions of the foundation piles is a key factor to affect the group effect occurred in the pile group. By analyzing the relationship in motion of double piles subjected to the eccentric lateral loading. It was found that the angles between the movement directions of the leading pile and the trailing pile with their connection line, η and θ, were in the range of 0°≤η≤90° and ?90°≤θ≤90°, respectively. Experimental and numerical data showed that the reduction factor was closely related to η and θ, which was used to quantify the pile-soil-pile interaction between two piles. There were a range for the combinations of η and θ in which no interaction occurred between them. Once the pile-soil-pile interaction existed, the influence of the interaction on the trailing pile was typically more significant than that on the leading pile. The concept of p-multiplier, which originally used to define the group effect in laterally loaded pile groups, was adopted to quantify the group effect on pile groups subjected to eccentric lateral loading. The p-multiplier of each pile can be calculated by multiplying cumulatively the reduction factors from all other piles in the group. An empirical formula was proposed to calculate the reduction factor according to the theoretical, experimental and numerical results. Then a calculation method of generalized p-multiplier was proposed. Two examples were employed to demonstrate the rationality of the method. |
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| Keywords: | eccentric loading group effect p-multiplier reduction factor |
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