预制混凝土支护管桩在深基坑工程中的应用_赵升峰.docVIP

第36卷 增刊1 岩 土 工 程 学 报 Vol.36 Supp.1 .11月 Chinese Journal of Geotechnical Engineering Nov. 2014 DOI：10.11779/CJGE2014S1016 预制混凝土支护管桩在深基坑工程中的应用 赵升峰1，黄广龙2，马世强1，周文苑1，章 新 1 (1. 南京市测绘勘察研究院有限公司，江苏 南京 210019；2. 南京工业大学交通学院，江苏 南京 210009) 摘 要：先张法预应力预制混凝土支护管桩作为一种新型的基坑支护桩，具有桩身质量好、强度高和成桩可靠等特点 值得推广与应用。基于基坑位移计算方法，分析了采用预应力预制混凝土支护管桩进行基坑支护，影响其位移变化的 参数，并结合南京邮电大学科研综合楼基坑工程实例，介绍了支护桩的布置方式，对比了基坑位移的理论计算值与实 测值，结果表明：计算位移变化平缓，最大值约在17.0～23.2 mm 之间；现场实测的最大水平位移值在16.10～21.50 mm 之间，二者数值接近，变化规律基本一致，证实了预应力预制混凝土支护管桩用于基坑支护的可靠性和有效性，值得 在同类工程中参考。 关键词：预制支护管桩；PCMW 工法；增量法；基坑位移；弹性支点法 中图分类号：TU473.2 文献标识码：A 文章编号：1000–4548(2014)S1–0091–06 作者简介：赵升峰(1986– )，男，注册岩土工程师，从事岩土工程设计与咨询工作。E-mail: zhaosf510@163.com。 Application of precast concrete pipe piles in a deep excavation project ZHAO Sheng-feng1, HUANG Guang-long2, MA Shi-qiang1, ZHOU Wen-yuan1, ZHANG Xin1 (1. Nanjing Institute of Surveying, Mapping Geotechnical Investigation Co., Ltd, Nanjing 210019, China; 2. College of Transportation Science Engineering Nanjing University of Technology, Nanjing 210009, China) Abstract: As a new type of retaining pile for foundation pit engineering, the pre-tensioned prestressed concrete pipe pile has many advantages, such as a good pile quality, high strength and reliable construction quality. It is worthy of popularization and application. Based on the displacement calculation method, the parameters that affect the displacement of excavation are further analyzed when the prestressed concrete pipe pile is used as the retaining pile. Through a practical example of research building of NUPT, the layout of retaining piles is introduced, and the measured displacement of the foundation pit is compared with the theoretical results. It is shown that the calculated displacement changes gently, and the maximum varies from 17.0 mm to 23.2 mm; while the measured values are between 16.1mm and 21.5mm. They are consistent with each other, and the change rule is almost identical. Thus the reliability and validity of the prestressed concrete re