灌注桩-水泥土挡墙复合围护在软土基坑中的应用研究  

Study on Application of Composite Enclosure of Bored Pile-cement-soil Retaining Wall in Soft Soil Foundation Pit

作　　者：郑建建 Zheng Jianjian(Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China;Shanghai Water Design&Engineering Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海200092 [2]上海水业设计工程有限公司,上海200092

出　　处：《市政技术》2022年第2期158-163,共6页Journal of Municipal Technology

摘　　要：上海长桥水厂大型水池基坑采用了灌注桩-水泥土挡墙复合围护,在保证基坑安全的同时有效保护了基坑外侧的管道。基于小应变硬化土本构模型对2种围护方案建立数值模型进行计算分析和对比研究,结果发现:水泥土挡墙外侧套打灌注桩后,围护结构侧向位移和坑外地表沉降均明显减小,管道侧向和竖向位移显著变小,管道保护效果较好;基坑开挖对管道强度影响不大;基坑开挖时土体位移最大处发生在管道顶部和底部。The composite enclosure of bored pile wall-cement soil retaining wall is adopted in a large pool foundation pit of Changqiao Water Works in Shanghai. The safety of the pit is ensured and pipelines outside are effectively protected. Based on hardening soil model with small strain stiffness, numerical models are established for 2 enclosure schemes to calculate and compare. The results show that when bored piles are constructed outside of the cement soil gravity retaining wall, both the lateral displacement of the enclosure and surface displacement of outside ground decease obviously. The lateral and vertical displacement of pipes also decease obviously. The effect of protecting pipes are better. The pipes strength are affected not very much by excavation of foundation pit. When the foundation pits are being excavated, the maximum displacement of soil appears at the top and bottom of the pipes.

关 键 词：灌注桩 水泥土挡墙 复合围护 数值模拟 

分 类 号：TU473.14[建筑科学—结构工程] TU476.4[建筑科学—土工工程]