| 上拔、水平联合荷载对桩基承载性能影响的现场试验及数值模拟 |
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| 引用本文： | 周俊鹏,黄雪峰,张吉禄,韦林辉,袁俊,王学明,刘永红.上拔、水平联合荷载对桩基承载性能影响的现场试验及数值模拟[J].中国公路学报,2021,34(3):113-123. |
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| 作者姓名： | 周俊鹏 黄雪峰 张吉禄 韦林辉 袁俊 王学明 刘永红 |
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| 作者单位： | 1. 陆军勤务学院 军事设施系, 重庆 401311;2. 岩土力学与地质环境保护重庆市重点实验室, 重庆 401311;3. 重庆交通大学 河海学院, 重庆 400074;4. 兰州理工大学 土木工程学院, 甘肃 兰州 730050;5. 西北电力设计院有限公司, 陕西 西安 710075;6. 中国人民解放军96784部队, 河南 洛阳 471300 |
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| 基金项目： | 重庆市研究生创新基金项目(CYB18126);西北电力设计院有限公司科技项目(XB1-TM05-2017)。 |
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| 摘 要： | 通常桩基受力作用分别确定上拔、水平2个方向的承载力，不考虑其相互影响，不能准确反映桩基的真实受力状况。为研究桩基上拔、水平荷载的耦合作用对桩基上拔、水平向承载性能的影响，开展了大型现场试验及数值模拟研究。研究结果表明：上拔、水平联合荷载对桩基承载性能的影响与上拔、水平向荷载的比例有较大关系，当该比例小于2时，联合荷载作用对桩基水平承载能力影响较小，不小于2时，桩基的水平承载能力明显被削弱，且被削弱的程度随着该比例的增大而提高；联合荷载下桩基的上拔荷载位移曲线与单独上拔时基本重合，但在加载比例较小时，桩基在水平方向会先达到破坏标准，从而导致桩基上拔承载能力不能充分发挥。联合荷载下，水平承载能力被削弱的原因在于桩基带动桩周土体的一起上拔导致了地基土抗力系数比例系数的减小和桩身弯矩的增大；联合荷载下，由于水平荷载的作用，桩基上部受压侧竖直方向的土压力会由于土体被挤密而变大，上部受拉侧土压力则会由于桩与土的分离而变小；桩基下部则由于桩基的刚性转动表现出相反的趋势；联合荷载下桩基破坏时，破坏区域的土体裂缝呈扇形分布，其分布形式、范围及破坏机理均与单独上拔、水平荷载时有较大差别。总体来说，联合荷载对桩基承载性能的影响是客观存在且不可忽视的。
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| 关 键 词： | 道路工程 联合荷载 现场试验 数值模拟 桩基承载性能 |
| 收稿时间： | 2019-11-26 |
Experimental and Numerical Investigation of the Effect of Uplift and Lateral Combined Loading on the Bearing Capacity of Piles |
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| ZHOU Jun-peng,HUANG Xue-feng,ZHANG Ji-lu,WEI Lin-hui,YUAN Jun,WANG Xue-ming,LIU Yong-hong.Experimental and Numerical Investigation of the Effect of Uplift and Lateral Combined Loading on the Bearing Capacity of Piles[J].China Journal of Highway and Transport,2021,34(3):113-123. |
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| Authors: | ZHOU Jun-peng HUANG Xue-feng ZHANG Ji-lu WEI Lin-hui YUAN Jun WANG Xue-ming LIU Yong-hong |
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| Affiliation: | (Department of Military Installations,Army Logistical Academy of PLA,Chongqing 401311,China;Chongqing Key Laboratory of Geomechanics&Geoenvironment Protection,Chongqing 401311,China;School of Hohai,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;Northwest Electric Power Design Institute Co.Ltd.,Xi'an 710075,Shaanxi,China;The 96784 Unit of Chinese PLA,Luoyang 471300,Henan,China) |
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| Abstract: | The uplift and lateral bearing capacity of piles are commonly determined independently irregardless of their interactions in practice;however,this does not reflect their reality.The bearing capacity of piles under uplift and lateral combined loading was studied through field experiments and numerical simulation.The results show that the influence of the combined loading on the bearing capacity of piles is correlated closely related to the ratio of uplift to lateral load.In this study,the combined loading has little influence on the lateral bearing capacity when the ratio is less than 2;however,the lateral bearing capacity is obviously weakened when the ratio is greater than 2 and the degree of weakening increases with the increase in ratio.The uplift load displacement curve under the combined loading coincides with that under the uplift load.However,when the loading ratio is relatively small,the piles reach the failure standard earlier in the lateral direction,which leads to the failure of fully exerting the uplift bearing capacity.The lateral bearing capacity is weakened under the combined loading because the pile drives the soil around it to pull up in unison,which leads to a decrease in the proportion coefficient of soil resistance and the acceleration of the pile bending moment.Under the combined loading,the vertical earth pressure on the compression side increases due to the compaction of soil and the pressure on the tensile side decreases due to the separation of pile and soil for the upper part due to the lateral load.However,the vertical earth pressure on the lower part of the pile shows the opposite trend due to the rigid rotation of the pile.The soil cracks in the failure area are distributed in a fan shape under combined loading,where range,distribution,and failure mechanism are significantly different from those under uplift and lateral load.The influence of combined loading on the bearing capacity of piles is objective and cannot be ignored. |
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| Keywords: | road engineering combined loading field experiment numerical simulation bearing capacity of piles |
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