|Table of Contents|

Influence of Soil Mass Reinforcement Scope in Passive Zone on Whole Deep Excavation(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2012年04期
Page:
96-105
Research Field:
Publishing date:

Info

Title:
Influence of Soil Mass Reinforcement Scope in Passive Zone on Whole Deep Excavation
Author(s):
JIANG Jian-ping
School of Ocean Environment and Engineering, Shanghai Maritime University, Shanghai 201306, China
Keywords:
reinforcement;  passive zone;  deep excavation;  ground settlement;  heave of pit bottom;  bending moment;  shearing force;  axial force
PACS:
TU432
DOI:
-
Abstract:
Based on numerical simulation method, the influence of soil mass reinforcement scope in passive zone(the bottom of deep excavation)on whole deep excavation was studied. The correlativity curves(the maximum of ground settlement, the maximum of heave value of bottom, the horizontal displacement of wall top and the stability safety factor of whole deep excavation versus the reinforcement depth and the reinforcement width)were established. The study results show that with the enlargement of soil mass reinforcement scope(the reinforcement depth or the reinforcement width), the displacement of the whole deep excavation decreases and tends to uniformity, the force of the construction becomes rational. The heave of bottom reduces as a whole, the settlement of ground, the bending moment(or shearing force or axial force)of the supporting wall and the horizontal displacement of supporting wall(except for the top of the wall whose horizontal displacement increase slightly)decrease obviously and tend to steady values; when the reinforcement width is 7.5 m(the half of whole reinforcement width), the heave curves of the bottom of deep excavation with different reinforcement depths are almost parallel step-like pencil of curves, and when the reinforcement width is 15 m, the heave curves of the bottom of deep excavation with different reinforcement depths are almost parallel gently pencil of curves; with the stepwise increase of reinforcement width(here the reinforcement depth value is constant), the heave value of pit bottom reduces obviously, the scope of higher heave zone dwindles gradually, especially, the scope of higher heave zone is zero when the reinforcement width is 15 m; the stability safety factor of whole deep excavation increases with the increase of the reinforcement scope. The soil mass reinforcement in passive zone is favorable to deep excavation; there exists appropriate reinforcement depth, and the wider the reinforcement width is, the better is.

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Last Update: 2012-12-20