风化地层圆形顶管下穿既有高速公路掘进隆沉变形控制被引量：3

On Uplift and Subsidence Deformation Control of Circular Jacking Pipe in Weathering Strata Under the Existing Expressway

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摘要风化岩层圆形浅埋隧道在掘进过程中岩层表现出隆沉变形状态,而顶进力作为其重要影响因素,分析二者之间的联系对岩层变形控制有重要的意义.以青岛地铁8号线电力线路浅埋隧道采用顶管施工为工程背景,运用理论分析与FLAC3D数值模拟研究在风化岩层圆形隧道开挖施工过程,分析在不同顶进力作用下岩体与管节变形情况.研究结果表明:顶进力作为施工过程中重要参数,对岩土变形有着重要影响;顶管处岩土沉降量均大于地表沉降量,但由于顶进力的存在可能会导致岩土先产生隆起之后再产生沉降,且随着顶进力的增大,隆起量也明显增大,但隆起量敏感度高于沉降量;同时顶进力会引起开挖面附近岩土应力变化,但影响范围有限,开挖面左右5~10 m,后方0~10 m为顶进力重要影响区. The rock strata of circular shallow tunnel in weathered rock strata show uplift deformation during excavation,and the driving force is an important influencing factor.It is of great significance to analyze the relationship between the two rock strata deformation control.Taking the pipe jacking construction of shallow buried unnel of Qingdao Metro Line 8 as the engineering background,the theoretical analysis and FLAC3D numerical simulation are used to study the excavation process of circular tunnel under weathered geological conditions,and the deformation of rock mass and pipe section under different driving forces is analyzed.Results show that tunneling force,as an important parameter in the construction process,has an important influence on rock and soil deformation.The rock and soil settlement at the pipe jacking is greater than the surface settlement value,but the existence of tunneling force may lead to rock and soil uplift first and then settlement,and with the increase of tunneling force,the uplift is also significantly increased,but the sensitivity of uplift is higher than the settlement;at the same time,the tunneling force will cause the change of rock and soil stress near the excavation face,but the influence range is limited.The excavation face is about 5~10 m,and the range of 0~10 m behind is the important influence area of tunneling force.

作者周军强凌涛龙明华彭学军彭文庆 ZHOU Junqiang;LING Tao;LONG Minghua;PENG Xuejun;PENG Wenqing(No.1 Engineering Co.,Ld.,China Railway No.5 Engineering Group Company,Changsha 410117,China;School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区中铁五局集团第一工程有限责任公司湖南科技大学资源环境与安全工程学院

出处《湖南科技大学学报（自然科学版）》 CAS 北大核心 2023年第1期35-42,共8页 Journal of Hunan University of Science And Technology：Natural Science Edition

基金国家自然科学基金资助项目(51974118)。

关键词风化地层浅埋隧道数值模拟顶管施工隆沉变形 weathered strata shallow tunnel numerical simulation pipe jacking uplift and settlement

分类号 U418.5 [交通运输工程—道路与铁道工程]

作者简介通信作者:凌涛,E-mail:379664843@qq.com。