土工基础

›› 2017, Vol. 31 ›› Issue (6): 702-708.

• 工程实录 • 上一篇    下一篇

软土深基坑TRD工法型钢水泥土墙支护结构的承载性能研究

朱宏伟   

  1. （江苏燕宁工程建设有限公司，南京 210019）
  • 收稿日期:2017-11-13 修回日期:2017-11-24 出版日期:2017-12-20 发布日期:2017-12-27
  • 作者简介:朱宏伟（1971-），男，高级工程师，研究方向为公路、桥梁施工技术及项目管理。

Performance of Hot Rolled Steel Beam Reinforced Soil Cement Mixed Wall Constructed by TRD Method as the Deep Excavation Support in Soft Soils

ZHU Hongwei   

  1. (Jiangsu Yanning Engineering Construction Co., Ltd., Nanjing 210019)
  • Received:2017-11-13 Revised:2017-11-24 Online:2017-12-20 Published:2017-12-27

摘要： TRD工法型钢水泥土墙在开挖深度小于10 m的软土深基坑中能够身兼挡土和止水作用，与传统的SMW工法相比有显著的技术和经济优势。如同其他水泥土搅拌工艺，TRD工法形成的水泥土墙也存在极强的空间不均匀性，这必然会影响型钢水泥土墙支护结构的承载性能，但既有文献鲜有涉及。鉴于此，总结分析了现场TRD工法水泥土墙内强度分布规律，并基于随机有限元方法，重点揭示了水泥土强度空间变异性对型钢水泥土墙支护结构承载性能的影响规律。结果表明：水泥土材料参数空间变异性对TRD工法型钢水泥土连续墙的承载性能影响较为明显，在设计中应该予以充分重视；控制现场施工质量、尽量降低搅拌不均匀性，是提高软土深基坑TRD工法型钢水泥土墙支护结构承载性能的有效措施之一。

关键词: 基坑, TRD工法, 型钢水泥土墙, 承载性能, 空间变异性, 随机场

Abstract: Compared with the conventional Soil Mixed Wall (SMW) system as the deep excavation supporting system with excavation depths less than 10 meters, the hot rolled steel beam reinforced soilcement mixed wall constructed by the Trench cutting Remixing Deep (TRD) method has the cost effective as well as the advantages since the TRD wall can serves both the retaining and slurry walls. Similar to other soil cement mixed walls, the wall thickness over the entire length is usually a challenge. The nonuniform TRD walls will certainly affect the supporting performance but the case histories rarely reported. This paper presents the study of the strength distribution within the TRD constructed and hot rolled steel beam reinforced soil cement mixed walls. The impact of the strength variation within the soil mixed wall on the deep excavation supporting system is numerically investigated. It is concluded that the construction quality control during the wall excavation is critical for this type of excavation supporting system.

Key words: Deep Excavation, TRD Method, Hot Rolled Steel Beam Reinforced Soil Cement Mixed Wall, Supporting Performance, Spatial Variability, Random Field