|Table of Contents|

Particle Flow Simulation of Underwater Concrete Filling Thickness by Tremie Method(PDF)

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

Issue:
2020年02期
Page:
118-126
Research Field:
Publishing date:

Info

Title:
Particle Flow Simulation of Underwater Concrete Filling Thickness by Tremie Method
Author(s):
LI Bo1;  WANG Gui-he1;  LYU Gao-feng2;  REN Jun3;  YU Bo1
(1. School of Engineering and Technology, China University of Geosciences(Beijing), Beijing 100083, China; 2. Beijing Metro Construction Administration Corporation Ltd., Beijing 100068, China; 3. CCCC Tunnel Engineering Company Limited, Beijing 100102, Ch
Keywords:
tremie method;  underwater concrete filling;  filling thickness;  PFC numerical simulation;  tremie arrangement;  groundwater level
PACS:
TU470
DOI:
10.19815/j.jace.2019.03047
Abstract:
Based on the deep foundation pit project of Yongdingmenwai Station of Beijing Metro Line 8, the application of the underwater concrete filling process of the tremie method in the deep foundation pit sealing project was introduced. On the basis of particle flow theory and micromechanics, the micro-structure and macro-behavior of soil were connected. The underwater concrete filling model was established by PFC numerical software. The visualization of underwater concrete pouring process of single-tremie and multi-tremie in sandy pebble stratum was realized, and the pouring situation and final sealing results in each period were obtained. Comparing the measured thickness curves of the same position, the maximum error was 0.3 m, which verified the rationality of the model. The sensitivity factors affecting the thickness of underwater concrete in deep foundation pits(the form of tremie arrangement and the height of groundwater level)were proposed. The results show that the PFC numerical simulation technology based on particle flow theory is suitable for the underwater concrete filling process of simulated tremie method. When the tremie layout is sparse, the particles can not interact, the more likely to appear “stacking” and “sinking”, the average filling thickness is less than 3 m. Refer to the diffusion radius of 3 m of single-tremie underwater concrete, the tremie should be properly encrypted to ensure the thickness of the back cover. The higher the groundwater lever is, the greater the thickness fluctuation is. The lower the water level is, the more uniform the filling thickness is. Within the scope of the project, the appropriate encryption of the tremie can ensure the thickness of the concrete back cover. The use of precipitation measures to reduce the groundwater level can ensure the flatness of the back cover.

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Last Update: 2020-04-21