中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (1): 125-131.doi: 10.16265/j.cnki.issn 1003-3033.2021.01.018

• 安全工程技术 • 上一篇    下一篇

砂卵石深基坑支护嵌入比安全优化研究

冯阵图1 高级工程师, 李达2 高级工程师   

  1. 1 中铁十五局集团 第二工程有限公司,河南 焦作 454002;
    2 河南科技大学 土木工程学院,河南 洛阳 471000
  • 收稿日期:2020-10-27 修回日期:2020-12-22 出版日期:2021-01-28 发布日期:2021-07-28
  • 作者简介:冯阵图 (1978—),男,河南郑州人,本科,高级工程师,主要从事城市轨道交通建设管理工作。E-mail:2051358687@qq.com。
  • 基金资助:
    洛阳市轨道交通 1 号线项目(LYGD1-ZX-HYFW-(2017)118-chlscky)。

Study on safety optimization of embedding ratio of sand gravel deep foundation pit

FENG Zhentu1, LI Da2   

  1. 1 The 2nd Construction Co., Ltd. of China Railway Construction 15th Group, Jiaozuo Henan 454002, China;
    2 College of Civil Engineering, Henan University of Science and Technology, Luoyang Henan 471000, China
  • Received:2020-10-27 Revised:2020-12-22 Online:2021-01-28 Published:2021-07-28

摘要: 为指导砂卵石地层深基坑支护结构的经济化设计和安全施工,以洛阳地铁为例,基于多个安全评价指标,提出深基坑支护结构嵌入深度(嵌入比)的优化方法。考虑到砂卵石地层的特殊性质,深基坑建设需满足一定的变形和安全系数要求,因此分析地表沉降、支护结构稳定性、地层抗隆起安全性和防地下水管涌安全性,并基于限定位移和安全系数对支护嵌入比的选取范围作优化分析。结果表明:洛阳砂卵石地层因地下水位和卵石层揭露深度差异,可以划分为2类,Ⅰ类(中等地下水位和浅揭露砂卵石)和II类(低地下水位和深揭露砂卵石)深基坑的最优嵌入比范围分别为0.28~0.52和0.2~0.44。

关键词: 砂卵石, 嵌入比, 沉降, 地下水位, 安全稳定性

Abstract: In order to guide economic design and safe construction of deep foundation pit support structure in sandy gravel stratum, an optimization method of embedded depth (ratio of embedment) for supporting structure was put forward based on multiple safety evaluation indexes.with Luoyang Metro as an example Considering special properties of sandy cobble stratum which required construction of deep foundation pit to meet certain requirements of deformation and safety factor, surface settlement, stability of supporting structure, safety against uplift and safety against underground water gushing were analyzed, and selection range of embedding ratio was optimized based on limited displacement and safety factor. The results show that due to difference of groundwater level and exposed depth of pebble layer, Luoyang sandy cobble stratum can be divided into two types, and optimal embedding ratio ranges of type I (medium groundwater level and shallow exposed sand gravel) and type II (low groundwater level and deep exposed sand gravel) of deep foundation pit are 0.28 ~ 0.52 and 0.2 ~ 0.44, respectively.

Key words: sandy gravel, ratio of embedment, settlement, groundwater level, safety and stability

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