开挖顺序对PBA地铁车站竖向土压力分布影响

doi:10.12068/j.issn.1005-3026.2021.06.015

东北大学学报（自然科学版） ›› 2021, Vol. 42 ›› Issue (6): 857-863.DOI: 10.12068/j.issn.1005-3026.2021.06.015

开挖顺序对PBA地铁车站竖向土压力分布影响

贾蓬^1,2，高登¹，刘冬桥²

(1. 东北大学资源与土木工程学院，辽宁沈阳110819；2. 东北大学深部岩土力学与地下工程国家重点实验室，辽宁沈阳110819)

修回日期:2020-07-29 接受日期:2020-07-29 发布日期:2021-06-23
通讯作者: 贾蓬
作者简介:贾蓬(1973-)，女，内蒙古呼和浩特人，东北大学副教授.
基金资助:
国家自然科学基金资助项目(U1602232); 中央高校基本科研业务费专项资金资助项目(N180701005，N170108029); 辽宁省自然科学基金指导计划资助项目(20180550225); 中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK1920).

Influence of Excavation Sequence on the Vertical Soil Pressure on PBA Subway Station

JIA Peng^1,2， GAO Deng¹， LIU Dong-qiao²

1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 2. State Key Laboratory for GeoMechanics and Deep Underground Engineering， Northeastern University， Shenyang 110819， China.

Revised:2020-07-29 Accepted:2020-07-29 Published:2021-06-23
Contact: GAO Deng
About author:-
Supported by:
-

摘要/Abstract

摘要： 以北京地铁六号线PBA工法东四站为工程背景，分析了开挖顺序对小导洞和车站拱顶的竖向土压力分布的影响.结果表明:边导洞外侧拱脚竖向土压力约为内侧拱脚处的1.27倍，拱顶存在明显偏压现象，上下层边导洞外拱脚处竖向土压力分别约为土体自重应力1.1倍和1.2倍.中导洞竖向土压力受同层导洞开挖顺序影响，后施工的导洞其竖向土压力更大.拱顶竖向土压力主要受扣拱顺序影响，采用“先边后中”施工方案时，拱顶竖向土压力波动范围较大，边跨跨中竖向土压力最小约为自重应力0.77倍，拱与导洞相接部位竖向土压力最大约为自重应力1.05倍.

关键词: PBA工法；竖向土压力；开挖顺序；小导洞；车站拱顶

Abstract: By taking the Dongsi PBA station of Beijing Metro Line 6 as an example， the influence of the excavation sequence on the distribution of the vertical earth pressure on the pilots and the station arches was analyzed respectively. The results show that soil pressure on the station arches is bias， and the vertical earth pressure at the arch feet of the outer side pilots is 1.27 times than that at the inner side pilots. The vertical earth pressure at the outer arch feet of the upper and lower side pilots is about 1.1 times and 1.2 times of the gravity stress respectively. The vertical earth pressure on the central pilots is affected by the excavation sequence of the pilots in the same level， and is larger on the later constructed pilots. The vertical earth pressure on the station arch is mainly affected by the construction sequence of the arches. In the “first edge and then middle pilot” construction plan， the vertical earth pressure on the crown arches of the station fluctuates as such that the vertical earth pressure on the side span can be as low as 0.77 times the gravity stress， while the vertical earth pressure at the junction of the arch and the central pilot can be as high as 1.05 times the gravity stress.

Key words: PBA construction method; vertical earth pressure; excavation sequence; pilot; station arch

中图分类号:

U231.4
TU432

贾蓬，高登，刘冬桥. 开挖顺序对PBA地铁车站竖向土压力分布影响[J]. 东北大学学报（自然科学版）, 2021, 42(6): 857-863.

JIA Peng， GAO Deng， LIU Dong-qiao. Influence of Excavation Sequence on the Vertical Soil Pressure on PBA Subway Station[J]. Journal of Northeastern University(Natural Science), 2021, 42(6): 857-863.

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开挖顺序对PBA地铁车站竖向土压力分布影响

Influence of Excavation Sequence on the Vertical Soil Pressure on PBA Subway Station

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