|Table of Contents|

Dewatering model test of advanced deep hole in deep-buried tunnel(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2019年05期
Page:
42-52
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Dewatering model test of advanced deep hole in deep-buried tunnel
Author(s):
ZOU Chong1; 2;  LEI Sheng-you3;  ZHANG Wen-xin1
(1. China Railway Tunnel Consultants Co., Ltd., Guangzhou 511458, Guangdong, China; 2. State Key Laboratory of Shield Machine and Boring Technology, China Railway Tunnel Group Co., Ltd., Zhengzhou 450001, Henan, China; 3. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
tunnel engineering;  rich water powder fine sandstone;  advanced deep hole;  model test;  dewatering law
PACS:
U455.49
DOI:
-
Abstract:
For the problem of tunnel palm surface collapsing and initial support cracking deformation caused by the sudden water surge in the weak glue-rich water powder fine sandstone, the advanced deep hole dewatering method in deep-buried tunnel was studied. A solid model for simulating the tunnel advanced dewatering was established. The water level surface changes of the model at each moment under 3 kinds of dewatering tubes and 3 kinds of pumping powers were analyzed. The three-axis test was used to analyze the failure state of powder fine sandstone with high water content. Research result shows that the water head in the middle part of dewatering test model at the same elevation measuring point on the tangent section is low, rises gradually on both sides, and is in a parabola form, reflecting the dewatering laws of advanced deep hole. The powder fine sandstone failures plastically under high and low water contents, and the axial strain at the failure is less than 5%. In the dewatering process, when the stratum water content decreases from 20% to 11%, the strength, cohesion, and internal friction angle of powder fine sandstone reach the optimal stable states, realizing the waterless state of excavation surface. The advanced dewatering parameters in the tunnel should be the vacuum dewatering pipe with the diameter of 65 mm and the vacuum pump with the pumping power of 7.5 kW. The dewatering pipe should be arranged at the side walls on both sides of tunnel and at 20 m ahead of tunnel palm surface. The advanced deep hole dewatering supplemented with grouting reinforcement in the deep-buried tunnels with rich water powder fine sandstone can achieve the stability of powder fine sandstone during the excavation. It lays the foundation for the smooth construction of tunnel, and avoids the difficulty of deep well dewatering from the surface in the deep-buried tunnels. 2 tabs, 13 figs, 30 refs.

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Last Update: 2019-11-13