|Table of Contents|

Distribution characteristics of grouting reinforcement ring for tunnel with heterogeneous weak surrounding rock(PDF)

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

Issue:
2019年03期
Page:
58-70
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Distribution characteristics of grouting reinforcement ring for tunnel with heterogeneous weak surrounding rock
Author(s):
ZHANG Cong;  YANG Jun-sheng;  XIE Yi-peng;  DAI Yong;  LIANG Xiong;  GONG Fang-hao
(School of Civil Engineering, Central South University, Changsha 410075, Hunan, China)
Keywords:
tunnel engineering;  heterogeneous weak surrounding rock;  tunnel grouting;  grouting reinforcement ring;  fluid-solid coupling theory;  random distribution theory
PACS:
U455
DOI:
-
Abstract:
Based on the random distribution theory and fluid-solid coupling theory, the dynamic changes of physical parameters of surrounding rock and the time-varying viscosity of grouts in the grouting process were considered, a grout diffusion equation of a tunnel with heterogeneous weak surrounding rock under fluid-solid coupling was deduced. A grout diffusion model of small pipe grouting in heterogeneous weak surrounding rockwas established by using the multi-field coupling software COMSOL Multiphysics, and the effects of grouting parameters and arrangement of small pipe on the grout diffusion and the formation of grouting reinforcement ring were systematically studied. Research result shows that the grout in heterogeneous weak surrounding rock disperses in a quasi-elliptical shape. The diffusion patterns change continuously with the dynamic changes of grouting pressure, grouting time and parameters of surrounding rock, and finally tend to be stable. In the grouting process, the permeability of surrounding rock and the penetration capacity of grout can be improved to a certain degree with the increases of grouting pressure and grouting time. While increasing the length of small pipe or reducing the angle of small pipe is beneficial to the formation of grouting reinforcement ring. To achieve the optimal grouting effect, the pre-grouting reinforcement pressure of small pipe in Dongtoushan Tunnel should be designed as 1 MPa, the grouting time should be controlled at 400 s, the angle of small pipe should not be less than 30°, and the length of small pipe should be more than 2.5 m. With the field monitoring and verification, the 28-day compressive strength of tunnel surrounding rock increases to 2 MPa, the permeability coefficient of surrounding rock reduces to 10-5 cm·s-1, the settlement value of vault roof excavated by subsequent step method is less than 3 cm, and the integrity and continuity of surrounding rock are improved significantly. 3 tabs, 10 figs, 32 refs.

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Last Update: 2019-06-27