厚层黄土状土中扩底墩竖向承载性状

›› 2007, Vol. 28 ›› Issue (6): 1167-1171.

厚层黄土状土中扩底墩竖向承载性状

高广运¹，彭争光¹，蒋建平²，顾宝和³

1. 同济大学岩土及地下工程教育部重点实验室，上海 200092；2. 上海海事大学交通运输学院，上海 200135； 3.建设部综合勘察研究设计院，北京 100007

收稿日期:2005-06-28 出版日期:2007-06-11 发布日期:2013-09-13
作者简介:高广运，男，1961年生，博士，教授，岩土工程专业博士生导师，从事岩土工程教学和科研工作。
基金资助:
上海市重点学科（岩土工程）建设项目资助，同济大学（岩土工程）重点试验室资助。

Vertical bearing behavior of belled pier in thick loess-like soil

GAO Guang-yun¹, PENG Zheng-guang¹, JIANG Jian-ping ², Gu Bao-he³

1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. College of Traffic Transportation, Shanghai Maritime University, Shanghai 200135, China; 3. Comprehensive Institute of Geotechnical Investigation and Surveying, Ministry of Construction, Beijing 100007, China

Received:2005-06-28 Online:2007-06-11 Published:2013-09-13

摘要/Abstract

摘要： 根据同一试验场地厚层非湿陷性黄土状土中8根大直径扩底墩、2根等直径桩的竖向承载力静载试验，对扩底墩的竖向承载性状进行了研究。结果表明，在其他条件相同时，随扩底墩直径D的增大，虽单位面积极限端阻力有不同程度的降低，但墩的极限承载力Qu增大；当D和墩身直径d不变时，总极限侧阻力所占墩顶极限荷载的百分比随长径比L/d的增大而增大；d不变时，随长径比L/D的增加，各墩的墩顶荷载呈起伏变化，总端阻所占百分比（比等直径桩大）相应降低，平均极限侧阻力（比等直径桩小）相应增大，而L/D = 3时，其承载性状较好；在扩底墩墩身直径d与等直径桩相同、入土长度相当的情况下，前者承载力比后者大，且沉降小。

关键词: 大直径扩底墩, 竖向承载性状, 黄土状土, 长径比L/d, 长径比L/D, 等直径桩

Abstract: Based on the load tests of 8 large diameter belled piers and 2 friction piles, the vertical bearing behavior of the belled pier in non-collapsing loess-like soil is studied. The result shows that if other conditions are the same, the bearing capacity of belled pier (kN) increases and the end resistance decreases as the increase of the belled diameter. When both belled diameter (D) and shaft diameter (d) remain constants, the total ultimate side resistance enhances with L/d increasing. When the shaft diameter (d) is changeless, the bearing capacity of belled pier changes irregularly with L/D increasing; the percentage of total end resistance (greater than equal-diameter pile) decreases; the average ultimate side resistance (smaller than equal-diameter pile) increases; but better bearing behavior occurs as L/D=3. If the shaft diameter and the length of belled pier in soil are the same with the friction pile, the bearing capacity of the former is greater than the latter; and the settlement is smaller than the latter.

Key words: large diameter belled pier, vertical bearing behavior, loess-like soil, length-diameter ratio L/d, length-diameter ratio L/D, equal-diameter pile

中图分类号:

TU 470

高广运，彭争光，蒋建平，顾宝和 . 厚层黄土状土中扩底墩竖向承载性状[J]. , 2007, 28(6): 1167-1171.

GAO Guang-yun , PENG Zheng-guang , JIANG Jian-ping , Gu Bao-he . Vertical bearing behavior of belled pier in thick loess-like soil[J]. , 2007, 28(6): 1167-1171.

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