|Table of Contents|

Dynamic mechanism of surrounding rock and support of large-section tunnel passing through soft-plastic loess layer based on measured data(PDF)

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

Issue:
2023年01期
Page:
115-131
Research Field:
道路与铁道工程
Publishing date:
2023-02-20

Info

Title:
Dynamic mechanism of surrounding rock and support of large-section tunnel passing through soft-plastic loess layer based on measured data
Author(s):
LAI Hong-peng1;  ZHAO Ming-kun1;  LIU Yu-yang2;  HONG Qiu-yang1;  HUANG Peng-zhi3;  SHEN Peng-xiang4
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 3. Guangzhou Municipal Engineering Design and Research Institute Co., Ltd., Guangzhou 510030, Guangdong, China; 4. Sinohydro Corporation Engineering Bureau 15 Co., Ltd., Xi'an 710065, Shaanxi, China)
Keywords:
tunnel engineering;  soft-plastic loess layer;  field monitoring;  characteristic curve of surrounding rock and support;  mechanism;  control measure
PACS:
U456
DOI:
10.19818/j.cnki.1671-1637.2023.01.009
Abstract:
Three groups of typical sections with soft-plastic loess layer distributed in the tunnel crown, tunnel body, and tunnel bottom respectively were selected for testing. The deformation characteristics of surrounding rock under the influence of soft-plastic loess layer, the mechanical characteristics of support structure, and their differences were analyzed. The method to determine the characteristic curve of support based on the measured data was proposed. The dynamic mechanism of surrounding rock and support under the influence of soft-plastic loess layer was revealed, and the corresponding control concepts and measures were offered. Analysis results show that the deformation of surrounding rock in descending order results from the soft-plastic loess layer distributed in the tunnel crown, tunnel body and tunnel bottom. The soft-plastic loess layer distributing in the arch shoulder and side wall of support structure of the tunnel crown, the arch waist and its lower positions, and the arch and inverted arch of the tunnel bottom, bears greater pressure of the surrounding rock. The direct reasons for the difference in the stresses of the three sections are the different directions of the main load of the support structure, the different release rates of the pressure of the surrounding rock with the excavation sequence, and the different seepage paths of groundwater. When the soft-plastic loess layer distributes in the tunnel crown and tunnel body, the release rate of advance stress of the surrounding rock is about 35%, and the mechanical properties of the support structure deteriorate rapidly after the upper bench excavation. When the soft-plastic loess layer distributes in the bottom of the tunnel, the excavation of soft-plastic loess layer in the lower bench significantly impacts the support structure. For the above three types of working condition, the control concepts of strong support, lateral pressure control, and sudden settlement prevention and the construction control measures such as the advance drapery grouting, large feet-lock pipe and sleeve valve pipe grouting at the bottom of the foundation, can effectively avoid disasters in construction. 4 tabs, 19 figs, 36 refs.

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Last Update: 2023-02-20