Back-filled grouting compaction model of shield tunnel based on spherical cavity expansion

YE Fei; CHEN Zhi; GOU Zhang-fei; MAO Yan-fei; LIU Qin

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YE Fei, CHEN Zhi, GOU Zhang-fei, MAO Yan-fei, LIU Qin. Back-filled grouting compaction model of shield tunnel based on spherical cavity expansion[J]. Journal of Traffic and Transportation Engineering, 2014, 14(1): 35-42.

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YE Fei, CHEN Zhi, GOU Zhang-fei, MAO Yan-fei, LIU Qin. Back-filled grouting compaction model of shield tunnel based on spherical cavity expansion[J]. Journal of Traffic and Transportation Engineering, 2014, 14(1): 35-42.

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Back-filled grouting compaction model of shield tunnel based on spherical cavity expansion

School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

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Author Bio:
YE Fei(1977-), male, associate professor, PhD, +86-29-82338926, xianyefei@126.com
Received Date: 2013-08-19
Publish Date: 2014-02-25

Abstract

Abstract

In order to study the compaction effect of back-filled grouting for shield tunnel, it was assumed that the grout expanded as a semi-sphere in clay stratum during compaction stage. The expansion process of spherical grouting was theoretically deduced by using elastic plastic theory, the back-filled grouting compaction model of shield tunnel was set up. The expansion rates of grouting, the plastic zone of soil mass and the pressure of grouting on segment were calculated. The effects of different parameters such as grouting pressure and the elasticity modulus, cohesive force and internal friction angle of surrounding soil on the pressure load of segment were analyzed. Analysis result shows that the pressure of grouting on segment increases with the increase of grouting pressure and soil mass Poisson's ratio, and decreases along with the increase of soil elastic modulus, cohesive force and internal friction angle. The pressure of grouting on unit area segment do not change along with the change of grouting pressure and soil characteristics. The pressure stress of back-filled grouting on segment becomes smaller and smaller when it is farther and farther away from grouting hole.
- tunnel engineering,
- shield,
- back-filled grouting,
- spherical cavity expansion,
- pressure distribution

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References(19)

References

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