含气地层双线盾构地表沉降实测分析

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摘要 研究目的: 较之于非含气地层,在含气地层中进行双线盾构掘进诱发的地表沉降规律鲜有报道。为研究含气地层中进行双线盾构掘进诱发的地表沉降规律,首先对国内地铁建设地区浅层气的分布及成分进行系统总结,并依托杭州地铁7号线塘青区间段工程,对含气地层双线盾构施工进行持续地地表变形监测,总结含气地层双线盾构掘进引起的地表沉降规律。
研究结论: (1)含气地层盾构掘进引发的地表沉降影响范围较大,地表沉降在盾构通过25 d后趋于稳定;(2)盾构在含气地层中掘进时,存在“三次扰动”效应;(3)含气土中存在“中间气压区”,导致土体排气不彻底,存在基质吸力,使先行线盾构掘进引发的沉降大于后行线;(4)含气地层盾构先行线地表沉降与土体损失率均大于后行线,与软土地区规律相异;(5)本研究成果对合理设置含气土地区盾构施工参数和控制地表变形具有参考作用。

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	丁智
	许教明
	何晨阳
	程康
	刁红国

关键词 ：含气土, 浅层气, 双线盾构, 地表变形, 土体损失率

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.

Key words： gas-bearing soil shallow gas double-line shield surface deformation soil loss rate

收稿日期: 2021-12-22

PACS:

TU43

基金资助:国家自然科学基金资助项目(52178400);国家自然科学基金项目(52009122);浙江省自然科学基金(重点项目)(LHZ20E080001);浙江省重点研发计划项目(2020C01102);浙江省自然科学基金项目(LQ21E090002)

作者简介: ^**丁智,1983年出生,男,教授,博士生导师,国家注册岩土工程师。

引用本文:

丁智, 许教明, 何晨阳, 程康, 刁红国. 含气地层双线盾构地表沉降实测分析[J]. 铁道工程学报, 2022, 39(11): 88-93.
DING Zhi, XU Jiaoming, HE Chenyang, CHENG Kang, DIAO Hongguo. Ground Settlement Analysis of a Double-line Shield in Hangzhou Gas-bearing Strata. Journal of Railway Engineering Society, 2022, 39(11): 88-93.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I11/88

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