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| Ground Settlement Analysis of a Double-line Shield in Hangzhou Gas-bearing Strata |
| DING Zhi1, XU Jiaoming1, HE Chenyang1, CHENG Kang2, DIAO Hongguo3 |
1. Anhui University of Science and Technology, Huainan, Anhui 232001, China;
2. Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province, Zhejiang, Hangzhou 310015, China;
3. Zhejiang University City College, Hangzhou, Zhejiang 310015, China |
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Abstract Research purposes: Compared with non-gas-bearing strata, surface settlement patterns induced by double-line shield tunneling in gas-bearing strata have rarely been reported. In order to study the surface settlement pattern induced by double-line shield tunneling in gas-bearing strata, a systematic summary of the distribution and composition of shallow gas in domestic metro construction areas was first conducted, and continuous surface deformation monitoring was carried out for double-line shield construction in gas-bearing strata based on the Tangqing interval section of Hangzhou Metro Line 7 project to summarise the surface settlement pattern induced by double-line shield tunneling in gas-bearing strata.
Research conclusions: (1) The surface settlement caused by shield tunneling in gas-bearing strata has a large impact range, and the surface settlement stabilizes after 25 days of shield passage. (2) There is a "three-time disturbance" effect when shield tunneling in gas-bearing strata. (3) The existence of an "intermediate pressure zone" in the gas-bearing soil leads to incomplete exhaust of the soil and the existence of matrix suction, which makes the settlement caused by shield tunneling in the first line larger than that in the second line. (4) The surface settlement and soil loss rate in the first line of shield tunneling in the gas-bearing strata are larger than that in the second line, which is different from the pattern in soft soil areas. (5) The research results have a reference role in setting reasonable shield construction parameters and controlling surface deformation in the gas-bearing soil areas.
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Received: 22 December 2021
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2022, Vol. 39 
