|Table of Contents|

Study on supporting effect of expansion-shell pre-stressed hollow anchor and improvement of grouting technology(PDF)

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

Issue:
2023年03期
Page:
142-151
Research Field:
隧道工程
Publishing date:

Info

Title:
Study on supporting effect of expansion-shell pre-stressed hollow anchor and improvement of grouting technology
Author(s):
WANG Yonggang1; YU Min1;  WANG Jiang1;  DONG Yaobin1;  CHE Zhiyuan1;  WEI Bin2; YANG Yubo3;  WANG Zhifeng3
(1. The First Engineering Co.,Ltd of China Railway Beijing Engineering Group, Xi'an 710100, Shaanxi, China; 2. Xinxiang Transportation Bureau, Xinxiang 453000, Henan, China; 3. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
tunnel engineering;  expansion-shell pre-stressed hollow anchor;  supporting effect;  grouting technology;  numerical simulation
PACS:
TU472
DOI:
10.19815/j.jace.2022.12055
Abstract:
In order to study the supporting effect of expansion-shell pre-stressed hollow anchor on deep-buried tunnels and put forward improvement measures for the existing grouting technology, based on the Xiangshan Tunnel project of Zhongwei-Lanzhou Railway, the finite difference numerical analysis software FLAC3D was used to compare and analyze the deformation and stress state of tunnel surrounding rock under the support of ordinary mortar anchor and expansion-shell pre-stressed hollow anchor. The influence of anchor length and grouting age on the anchoring effect was analyzed by field anchoring test. Based on the field grouting test, the influence of grouting method and grouting pressure on the grouting compactness of expansion-shell pre-stressed hollow anchor was analyzed, and the improvement measures for the existing grouting technology were put forward. The results show that compared with the ordinary mortar anchor, the expansion-shell pre-stressed hollow anchor has better effect on controlling the deformation and stress state of the surrounding rock, and the deformation of surrounding rock can be reduced by about 40%. Compared with the anchorage length, the curing age of grouting has a more significant effect on the supporting effect of expansion-shell pre-stressed hollow anchor. When the curing age is 28 d, the supporting effect can be improved by 50.12%. When the internal grouting of anchor is adopted, the grouting pressure needs to be greater than 0.8 MPa to achieve the best effect, and the grouting method is suitable for the horizontal and downward installation of the expansion-shell pre-stressed hollow anchor. When the external grouting of anchor is adopted, the greater grouting pressure should be adopted, and the grouting method is suitable for the upward installation of the anchor. The improved grouting port of anchor can effectively prevent slurry leakage and ensure the compactness of grouting, which plays a positive role in protecting anchor and strengthening the connection between anchor and stratum.

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Last Update: 2023-05-20