孤石群地层高层建筑桩基础施工设计优化与应用分析

引用文献:

余渊 潘多忠 邹锦华. 孤石群地层高层建筑桩基础施工设计优化与应用分析[J]. 建筑结构,2023,48(10):134-139,104.

YU Yuan PAN Duozhong ZOU Jinhua. Design optimization and application analysis of pile foundation construction of high-rise buildings in isolated rock group regions[J]. Building Structure,2023,48(10):134-139,104.

作者:余渊 潘多忠 邹锦华
单位:深圳市南山区建筑工务署 深圳市首嘉工程顾问有限公司 广东工业大学土木与交通工程学院
摘要:孤石地层的存在是困扰桩基础施工的主要难题,其不仅关系到桩基稳定,更关系到工程的投资。为合理解决此类问题,以深圳某高层建筑桩基础施工工程为研究背景,此工程地层存在分布范围广且尺寸大的孤石群。根据总体地勘资料、设计要求和现场条件,提出了孤石群地层中桩基础施工设计优化方案,并对其进行了经济性分析。所得到的主要结论如下:原设计桩基极有可能穿过巨大孤石,浪费明显,成本高;对于全风化和强风化花岗岩层内,采取桩底分别进入孤石内4.5m和3.7m深,锚杆进入岩层长度在3~8m的方案;优化施工方案后桩基和锚杆数量分别占其总数量的57.34%和5.04%,相比原设计方案节约造价1 559.38万元和449.22万元,同时桩基的质量检测均符合要求。
关键词:孤石群;高层建筑;桩基础;设计施工方案优化;
作者简介:余渊,学士,正高级工程师,主要从事建筑工程全过程工程管理研究,Email:1603901321@qq.com。潘多忠,博士,正高级工程师,主要从事结构施工力学、全过程工程咨询与数字化应用研究,Email:ddp201@126.com。
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Design optimization and application analysis of pile foundation construction of high-rise buildings in isolated rock group regions
YU Yuan PAN Duozhong ZOU Jinhua
(Bureau of Public Works of Shenzhen Nanshan Shenzhen Sogar Engineering Consultants Co., Ltd. School of Civil and Transportation Engineering, Guangdong University of Technology)
Abstract: The isolated rock region is a key challenge for the construction of pile foundation construction project, which not only related to the stability of the pile foundation, but also related to the construction project costs. To reasonably overcome this issue, taking the pile foundation construction project of a high-rise building in Shenzhen as the research background, the stratum of this project has a wide distribution range and large size isolated rock group. Based on all the geological exploration data, design requirements and site conditions, the optimized construction design of pile foundation in isolated rock group region was proposed. Meanwhile, the economy of the proposed plan was also analyzed. The main conclusions drawn are as follows: the original design of pile foundation is very likely to pass through huge isolated rock, the waste is obvious, and the cost is high. For the fully weathered and strongly weathered granite layer, the scheme that the pile bottom intrusions into the isolated rock are 4.5m and 3.7m respectively and the length of rock intrusion by the anchor should be within 3~8m was adopted. The number of pile foundation and bolt accounts for 57.34% and 5.04% of the total number of the optimized construction scheme, and the cost was saved by 15.593 8 million yuan and 4.492 2 million yuan compared with the original design scheme, meanwhile, the quality test of pile foundation meets the requirements.
Keywords: isolated rock group; high-rise building; pile foundation; optimization for design and construction scheme
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