富水圆砾地层土压平衡盾构停机地层变形特征实测分析

doi:10.3973/j.issn.2096-4498.2020.01.014

中国科学引文数据库（CSCD）核心期刊
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《日本科学技术振兴机构数据库（中国）》

隧道建设（中英文） ›› 2020, Vol. 40 ›› Issue (1): 106-113.DOI: 10.3973/j.issn.2096-4498.2020.01.014

富水圆砾地层土压平衡盾构停机地层变形特征实测分析

李志军¹, 房有亮², 肖　钢¹, 赖文辉¹, 瞿　勇³, 傅金阳³, 徐　赞²

(1. 中铁五局集团有限公司城市轨道交通工程分公司, 湖南长沙　 410205; 2. 中铁开发投资集团有限公司, 云南昆明　 650118; 3. 中南大学土木工程学院, 湖南长沙　 410075)

收稿日期:2019-08-13 出版日期:2020-01-20 发布日期:2020-04-04
作者简介:李志军(1974—),男,湖南益阳人,2001年毕业于湖南城市学院,土木工程专业,专科,高级工程师,现从事市政工程工作。 E-mail: 467409227@qq.com。

Ground Deformation Characteristics of Water-rich Gravel Stratum during EPB Shield Stop

LI Zhijun¹, FANG Youliang², XIAO Gang¹, LAI Wenhui¹, QU Yong³, FU Jinyang³, XU Zan²

(1. Urban Rail Transit Engineering Branch of China Railway Fifth Bureau Group Co., Ltd., Changsha 410205, Hunan, China; 2. China Railway Development Investment Group Co., Ltd., Kunming 650118, Yunnan, China; 3. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China)

Received:2019-08-13 Online:2020-01-20 Published:2020-04-04

摘要/Abstract

摘要： : 为分析盾构停机期间地层变形规律,依托某富水圆砾地层地铁区间盾构工程,对盾构停机前后地层沉降变形和掘进参数变化进行监测和研究,并计算单纯由盾体下卧层压缩引起的地层沉降。结果表明: 盾构停机对盾体前方土体沉降变形影响更大,且沉降速率与停机时间密切相关;盾体后方土体沉降主要受盾构掘进地层损失影响,其沉降逐渐稳定,且土层深度越浅沉降越早稳定;对于近距离盾构下穿施工,下穿前停机造成的影响比下穿后停机造成的影响更大;盾构停机复推时由于总推力和上土舱压力大幅增大,地层沉降曲线出现先隆起再下沉的波动,深层沉降波动幅度显著大于地表沉降,表明富水圆砾地层盾构停机会放大对邻近深层土体的扰动影响,在盾构近距离下穿既有地下工程施工过程中应尽量避免停机。

关键词: 土压平衡盾构, 富水圆砾地层, 盾构停机, 地层沉降, 掘进参数

Abstract: The variations of ground settlement and shield boring parameters before and after shield stop of a metro shield section in water-rich gravel stratum are monitored and analyzed, and the ground settlement induced by shield body weight is calculated. The results indicate that: (1) The shield stop affects the settlement of the soil in front of shield body greatly, and the settlement rate is closely related to the stop time. (2) The soil settlement behind the shield body, which is mainly affected by the ground loss caused by shield construction, gradually becomes stable over time, and the shallower the depth of the soil layer, the earlier the settlement becomes stable. (3) For closely undercrossing construction of a new tunnel underneath an existing one, the impact of shield stop before undercrossing is greater than that after undercrossing. (4) Due to the large increase of the total thrust of jacks and upper pressure of the soil chamber, the ground settlement curve fluctuates first and then subsides, and the fluctuation range of deep settlement is significantly larger than that of surface settlement, which shows that shield stop in water-rich gravel stratum will amplify the disturbance effect on the adjacent deep soil, and the shield stop should be avoided as much as possible during the closely undercrossing construction.

Key words: EPB shield, water-rich gravel stratum, shield stop, ground settlement, boring parameters

中图分类号:

U 455

李志军, 房有亮，肖钢, 赖文辉, 瞿勇, 傅金阳, 徐赞. 富水圆砾地层土压平衡盾构停机地层变形特征实测分析 [J]. 隧道建设, 2020, 40(1): 106-113.

LI Zhijun, FANG Youliang, XIAO Gang, LAI Wenhui, QU Yong, FU Jinyang, XU Zan. Ground Deformation Characteristics of Water-rich Gravel Stratum during EPB Shield Stop [J]. Tunnel Construction, 2020, 40(1): 106-113.

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富水圆砾地层土压平衡盾构停机地层变形特征实测分析

Ground Deformation Characteristics of Water-rich Gravel Stratum during EPB Shield Stop

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