考虑堆载时间效应的排桩水平承载力研究  

Lateral bearing capacity of row piles consideration of the time effect of surcharge loading

作　　者：竺明星 龚维明[2] 卢红前 王磊 王磊[2] ZHU Ming-xing;GONG Wei-ming;LU Hong-qian;WANG Lei;WANG Lei(Jiangsu Electric Power Design Institute （JSPDI） Co., Ltd. of China Energy Engineering Group, Nanjing,Jiangsu 211102, China;School of Civil Engineering, Southeast University, Nanjing, Jiangsu 210096, China)

机构地区：[1]中国能源建设集团江苏省电力设计院有限公司,江苏南京211102 [2]东南大学土木工程学院,江苏南京210096

出　　处：《中国港湾建设》2018年第1期12-18,共7页China Harbour Engineering

基　　金：中国博士后科学基金面上项目(2017M611955);江苏省博士后科研资助计划项目(1701028B);中能建江苏院科技项目(32-JK-2016-001);国家973项目(2013CB036304)

摘　　要：在局部塑性变形理论基础上,考虑软土地基土体强度参数随固结度变化关系进而考虑堆载作用的时间效应,推导得出堆载短期、长期作用时的桩身被动荷载分布及临界桩间距计算表达式。桩身响应求解过程中,考虑堆载长期作用产生的桩侧负摩阻力影响,引入附加弯矩概念进而解得桩身轴向荷载作用时的被动桩传递矩阵解,并通过案例对比验证了文中解的正确性。最后开展了参数影响分析,结果表明:堆载产生的负摩阻力对被动桩水平承载力影响可以忽略;临界桩间距(D1/d)crit随着堆载荷载减小、土体黏聚力和内摩擦角增加而增加,且(D1/d)crit合理范围应介于堆载短期、长期作用时的临界桩间距(D1/d)low和(D1/d)upper之间。Based on the local deformation theory of plasticity, the time effect of surcharge loading is evaluated withconsideration of the relationship between soil strength and consolidation degree. We deduced the expressions for distribution ofpassive load for pile shaft and critical pile spacing considering short-term and long-term effect of surcharge loading,respectively. During the procedure of solving pile response, we considered the influence of negative side friction caused by longterm load action, introduced the conception of additional moment arising from negative side friction and obtained thecorresponding transfer matrix solutions for passive pile under axial force along pile shaft. Moreover, we verified the correctnessof the solution through case comparison, and carried out the parameter analysis. The results indicate that the influence ofnegative skin friction induced by surcharge loading on the lateral bearing capacity of passive pile can be ignored. The criticalpile spacing, （D1/ d）crit, will increase with decreasing surcharge loading and with increasing cohesion and internal friction angleof soil mass. Furthermore, the value of （D1/ d）critshould be ranged between critical pile spacing （D1/ d）lowof short-term effectof surcharge loading and （D1/d）upperof long-term effect of surcharge loading.

关 键 词：堆载时间效应 排桩 附加弯矩 水平承载力 传递矩阵解 

分 类 号：U655.544.1[交通运输工程—港口、海岸及近海工程] TU473[交通运输工程—船舶与海洋工程]