土工基础

›› 2015, Vol. 29 ›› Issue (4): 51-53.

• 工程实录 • 上一篇    下一篇

超载作用下某深基坑工程桩锚支护数值分析

丁 伟1，王修蛟1，李晨雁1，朱常志2   

  1. (1.河北建设勘察研究院有限公司，石家庄 050031；2.河北农业大学，河北保定 071001)
  • 收稿日期:2015-01-12 出版日期:2015-08-20 发布日期:2015-11-06
  • 作者简介:丁伟(1987-)，男，助理工程师，研究方向为岩土工程设计、施工与管理。

Numerical Analysis of Ground Anchor and Soldier Pile System for a Deep Excavation under Surcharge

DING Wei1, WANG Xiujiao1, LI Chenyan1, ZHU Changzhi2   

  1. (1. Hebei Research Institute of Construction and Geotechnical Investigation Co. Ltd., Shijiazhuang 050031;
    2. Agricultural University of Hebei, Baoding 071001)
  • Received:2015-01-12 Online:2015-08-20 Published:2015-11-06

摘要： 依托唐山某深基坑工程，采用有限差分数值分析软件FLAC3D，模拟分析了地面超载在不同强度取值和不同作用位置情况下支护结构水平位移和桩身弯矩的变化规律。研究结果表明：地面超载作用位置一定，支护结构水平位移随地面超载取值的增大而增大，最大值出现在距坑底约1/3H（H为开挖深度）处，而不是坑顶；桩身弯矩绝对值沿桩身呈现先增大后减小的趋势，在坑底附近达到最大值。地面超载取定值，超载作用位置距坑边H范围内，支护结构最大水平位移出现在坑底附近，而不是坑顶；超载作用位置距坑边H范围外时，最大水平位移与无超载时相当；在超载作用位置距坑边0.4 H~0.7H范围内对最大桩身弯矩绝对值影响显著；研究成果可为类似地质条件下深基坑桩锚支护的设计和施工提供参考。

关键词: 超载, 深基坑, 桩-锚支护结构, 水平位移, 数值分析

Abstract: This paper presents the finite difference analysis results of the soldier pileground anchor system under the ground surcharge loading conditions by using FLAC3D. The horizontal deflection and the bending moment in the supporting system are analyzed under different strength values of the structure and the supporting positions. The results indicate that, with a fixed location, the horizontal deflection increase with an increase of the surcharge load magnitude. The maximum horizontal deflection presents at 1/3H (H is the total exposed excavation height). The bending moment along the soldier pile is first increasing with depth and then decreasing. The location of the maximum bending moment is near the bottom of the excavation. Under a fixed surcharge loading magnitude, if the surcharge is acting beyond a distance of the excavation height H, there is not impact of the deflection of the supporting structures. The maximum impact of the surcharge loading on the maximum magnitude of bending moment in the supporting structure is between a distance of 0.4H and 0.7H.

Key words: Surcharge Loading, Deep Excavation, Soldier Pile and Ground Anchor System, Horizontal Deflection, Numerical Analysis