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作 者:张健 李雨润 闫志晓[1] 戎贤 ZHANG Jian;LI Yurun;YAN Zhixiao;RONG Xian(School of Civil and Transportation Engineering,Hebei University of T echnology,Tianjin 300401,China;Civil Engineering Technology Research Center of Hebei Province,Hebei University of Technology,Tianjin 300401,China)
机构地区:[1]河北工业大学土木与交通学院,天津300401 [2]河北工业大学河北省土木工程技术研究中心,天津300401
出 处:《防灾减灾工程学报》2020年第2期204-213,共10页Journal of Disaster Prevention and Mitigation Engineering
基 金:国家自然科学基金项目(51778207);河北省自然科学基金项目(E2018202107);河北省研究生创新资助项目(CXZZBS2019041)资助。
摘 要:为研究饱和砂土场地地震液化情况下直斜群桩水平动力响应规律,使用浙江大学ZJU400土工离心试验设备进行了饱和砂土场地2×2高承台直斜群桩的离心机振动台模型试验,通过两组试验分别对于不同土层处的加速度时程以及孔压比进行分析。同时,结合饱和砂土的液化情况,分别针对2×2高承台直斜群桩在振动过程中承台水平动力响应以及桩身弯矩峰值的变化进行了对比分析。试验结果表明:随着振动强度的增大,饱和砂土层液化深度逐渐增加,尤其在近桩位置土层孔压比变化更为明显;直群桩承台水平加速度峰值在一定范围内出现了放大的现象,而斜群桩承台则基本未发生此显现;随振动强度的增加桩身弯矩峰值分布发生较大变化,其变化情况与饱和砂土液化有着较为密切的关系,在0.05g和0.1g工况下斜群桩桩身弯矩峰值明显小于直群桩,而0.3g工况时斜群桩桩身弯矩峰值出现了显著增加的现象并超过了同工况下直群桩情况。In order to study the horizontal dynamic response law of vertical and batter pile groups under the condition of seismic liquefaction in saturated sand,the centrifuge shaking table tests on 2×2 vertical and batter pile groups under elevated pile cap in saturated sand were carried out by using ZJU400 geotechnical centrifugal test equipment of Zhejiang University. Two sets of experiments were used to analyze the acceleration time history and pore pressure ratio in different soil layers. At the same time,combined with the liquefaction situation of saturated sand,the horizontal dynamic response of the pile cap and the change of the bending moment of the pile body were compared and analyzed for the 2×2 vertical and batter pile groups under elevated pile cap. The results show that:with the increase of vibration intensity,the liquefaction depth of saturated sand increases gradually,especially in the near-pile region,the change of pore pressure ratio is more obvious;the horizontal acceleration peak of the vertical pile group cap amplifies within a certain range,while that phenomenon does not occur for the batter pile group cap;With the increase of vibration intensity,the peak distribution of the bending moment of the pile body changes greatly. The change has a close relationship with the liquefaction of saturated sand. Under the conditions with peak accelerations of 0.05 g and 0.1 g,the peak bending moment of the batter pile group is obviously smaller than that of the vertical pile group,and the peak bending moment of the batter pile group shows a significant increase under the condition with peak acceleration of 0.3 g and exceeds that of the vertical pile group with the same working condition.
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