土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (6): 671-674.

• 专题论述 • 上一篇    下一篇

嵌岩桩在软质岩石地层中的单桩承载力计算

谢一凡1，朱寿增1，谢宝成2   

  1. （1.桂林理工大学土木与建筑工程学院，广西桂林 541004；2.广东省工程勘察院，广州 510510）
  • 收稿日期:2019-01-29 修回日期:2019-12-13 出版日期:2020-12-30 发布日期:2020-12-25
  • 作者简介:谢一凡（1996-），男，硕士研究生，研究方向为岩土工程。

Single Pile Axial Resistance Estimation of Piles Socketed in Soft Rock Formations

XIE Yifan1, ZHU Shouzeng1， XIE Baocheng2   

  1. (1.College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004;
    2.Guangdong GeotechnicalInvestigation and Survey Institute Co. Ltd.,Guangzhou. 510510)
  • Received:2019-01-29 Revised:2019-12-13 Online:2020-12-30 Published:2020-12-25

摘要： 沉积成因的岩石常常出现软硬互层，对于建筑基桩而言，尤其是软弱夹层的存在，是一种极为不利的地质条件，设计需要对嵌岩桩的持力层有明确的了解才能确定桩端持力层标高位置及验算单桩承载力特征值。对桩端持力层的实际强度较统计特征值或选用的设计计算值偏低时，如何通过调整扩大桩端承载面积或增加嵌岩深度来满足单桩承载力要求，以及选择微风化为桩端持力层时，当桩身穿过一层或多层中、强风化软弱夹层时，这些比微风化岩层相对偏软的岩层对桩周摩阻力的贡献如何折算等问题进行了探讨。


关键词: 嵌岩桩, 桩筏基础, 软硬互层, 半岩半土, 软化

Abstract: The weak-and hard alternating rock layers are frequently encountered in the sedimentary rock formations. However, these rock strata, especially, weak rock layers, are the unfavorable geological conditions for the rock socketed piles. In order to accurately determine the axial bearing resistance and the rock socketed depth, the performance of the weak-and-hard alternating rock layers should be thoroughly investigated. If the compressive strength of rock loading bearing layer are low or the assumed design values are low, the total bearing resistance of the rock socketed pile could be achieved by using a larger diameter pile or a deep rock socketed length. When pile tip is at the slightly weathered rock layer and the shaft is penetrating one or more weak zones, the side frictions in the weak rock layer should be reduced.

Key words: Rock Socketed Piles, Pile Supported Raft Foundations, Weak-and-Hard Alternating Rock Layers, Intermediate Geo-materials, Soften