STUDY OF WATER AND EARTH PRESSURE MODES ON SHIELD TUNNELS IN WATER-RICH DIORITE STRATA

CHEN Zhengfa; ZHANG Jie; YAN Zhiguo; BIAN Minghui

doi:10.13204/j.gyjzG21031806

Volume 51 Issue 7

Nov. 2021

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CHEN Zhengfa, ZHANG Jie, YAN Zhiguo, BIAN Minghui. STUDY OF WATER AND EARTH PRESSURE MODES ON SHIELD TUNNELS IN WATER-RICH DIORITE STRATA[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(7): 25-30. doi: 10.13204/j.gyjzG21031806

Citation:

CHEN Zhengfa, ZHANG Jie, YAN Zhiguo, BIAN Minghui. STUDY OF WATER AND EARTH PRESSURE MODES ON SHIELD TUNNELS IN WATER-RICH DIORITE STRATA[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(7): 25-30. doi: 10.13204/j.gyjzG21031806

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STUDY OF WATER AND EARTH PRESSURE MODES ON SHIELD TUNNELS IN WATER-RICH DIORITE STRATA

doi: 10.13204/j.gyjzG21031806

1. Environmental and Safety Engineering of Changzhou University, Changzhou 213164, China;
2. State Key Laboratory of Disaster Prevention in Civil Engineering, Tongji University, Shanghai 201804, China

Received Date: 2021-03-18
Available Online: 2021-11-11

Abstract

Abstract

In the complex geological environment, it is difficult to accurately calculate the water and earth pressure on shield tunnels. Based on the Jinan Metro line R2 as research basis, two representative sections were selected to measure the water and earth pressure on the lining structure, the evolution and distribution characteristics of water and earth pressure on the shield tunnel segments in different geological environments were analyzed. The results showed:1) In soft and hard nonuniform composite strata, due to differences in the physical and mechanical properties between strata, the water and earth pressure on measured sections would gradually kept it stable after being tunnelled about 20 shield segments away. 2) For normal consolidated soft clay or silty clay, when the thickness of the overlaying soil was greater than 2.5D (D was the outer diameter of the segmenting), the soil arching effect had already occurred, and the calculation method for loose earth pressure proposed by Terzaghi was more reasonable. For a tunnel with a thickness of less than 1.5D, the full soil column method was more appropriate.3) In a stratum with softer uppersoil and harder subsoil, the loads on both sides of the shield tunnel were asymmetrical, and the calculation mode of loads by the conventional correction method exaggerated the base reaction. 4) The measured water pressure on the two sections was generally close to the theoretical static water pressure.
- shield tunnel,
- complex stratum,
- field measurement,
- water and soil pressure

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References(17)

References

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