基坑开挖与降水引起下卧隧道变形的解析计算方法
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摘要
在针对基坑开挖对下卧既有隧道影响的预测方法中,常规解析计算方法仅考虑了开挖卸载对下卧隧道的影响,忽略了基坑降水因素的作用,必将使其预测结果存在一定误差。提出一种新的计算方法,该方法基于附加荷载两阶段法,结合土的有效应力原理,Mindlin解和Pasternak双参数地基模型,初步探讨了包含基坑降水因素影响的基坑施工对其下卧既有隧道的影响,并分析了降水因素在整个影响过程中的作用。最后以深圳车公庙枢纽工程西风道基坑为案例,将计算结果与既有隧道变形监测数据对比,验证了本文计算方法的有效性。
In the methods of predition of the effect of foundation pit excavation on underlying tunnel, the conventional analytical calculation method only considers the effects of excavation unloading on the underlying tunnel, ignoring the role of foundation pit dewatering factors, which will inevitably make errors in the prediction results. A new calculation method was proposed in this paper. Based on two-stage additional load method, combined with soil effective stress principle, Mindlin solution and two-parameter Pasternak foundation model, the method studied the foundation pit excavation effect on the underlying existing tunnel considering the influence of dewatering factor, and analyzed the role of dewatering in the whole process of influence. Finally, the calculation results were compared with the existing tunnel deformation monitoring data in the case of the west ventilation pavilion of Che Kung Temple Shenzhen project and verified the validity of the calculation method.
In the methods of predition of the effect of foundation pit excavation on underlying tunnel, the conventional analytical calculation method only considers the effects of excavation unloading on the underlying tunnel, ignoring the role of foundation pit dewatering factors, which will inevitably make errors in the prediction results. A new calculation method was proposed in this paper. Based on two-stage additional load method, combined with soil effective stress principle, Mindlin solution and two-parameter Pasternak foundation model, the method studied the foundation pit excavation effect on the underlying existing tunnel considering the influence of dewatering factor, and analyzed the role of dewatering in the whole process of influence. Finally, the calculation results were compared with the existing tunnel deformation monitoring data in the case of the west ventilation pavilion of Che Kung Temple Shenzhen project and verified the validity of the calculation method.
引文
[1] 况龙川. 深基坑施工对地铁隧道的影响[J]. 岩土工程学报,2000,22(3):284-288.KUANG Longchuan. Influence of Construction of Deep Foundation Pit on Tunnels of Metro[J]. Chinese Journal of Geotechnical Engineering, 2000,22(3):284-288.
[2] 温锁林. 近距离上穿运营地铁隧道的基坑明挖施工控制技术[J]. 岩土工程学报,2010,32(2):451-454.WEN Suolin. Construction Technology of Deep Open Excavation above Running Metro Tunnels[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(2):1067-1082.
[3] 闫静雅. 邻近运营地铁隧道的深基坑设计施工浅谈[J]. 岩土工程学报,2010,32(7):234-237.YAN Jingya. Design and Construction of Deep Foundation Pits Near Metro Tunnels[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(7):234-237.
[4] 姜兆华,张永兴. 基坑开挖对邻近隧道纵向位移影响的计算方法[J].土木建筑与环境工程,2013,35(1):7-11.JIANG Zhaohua, ZHANG Yongxing. Calculation of Influence on Longitudinal Deformation of Adjacent Tunnels due to Excavation[J]. Journal of Civil, Architectural and Environmental Engineering, 2013, 35(1):7-11.
[5] 黄义,何芳社. 弹性地基上的梁、板、壳[M].北京:科学出版社,2005:1-181.
[6] 王聚山. 基于布西奈斯克及明德林解答的复合地基附加应力解析法探讨[J].铁道建筑,2006,46(8):75-78.WANG Jushan. Discussionof Analytical Method of Additional Stress Based on Boussinesq and Mindlin Solution in Composite Foundation[J]. Railway Engineering, 2006,46(8):75-78.
[7] 刘运生. 深大型基坑降水引起地铁隧道沉降的控制措施分析[J].土工基础,2013,27(1):8-11.LIU Yunsheng. Control Measures of Subway Tunnel Settlement Caused by Deep Pit Excavation[J].Geotechnical Foundation, 2013, 27(1):8-11.
[8] 张明,潘炳玉. 基坑施工降水对邻近地铁隧道的影响[J].科学技术与工程,2013,13(21):6164-6170.ZHANG Ming, PAN Bingyu. Pit Dewatering Impact on the Adjacent Subway Tunnel[J]. Science Technology and Engineering, 2013, 13(21):6164-6170.
[9] 贾媛媛, 路军富, 魏龙海,等. 隧道降水施工对既有市政管线隧道影响研究[J]. 水文地质工程地质, 2010, 37(6):43-48.JIA Yuanyuan, LU Junfu, WEI Longhai, et al. Effect of Tunnel Dewatering on the Existing Municipal Pipeline[J]. Hydrogeology and Engineering Geology, 2010, 37(6):43-48.
[10] 刘庭金,邓飞皇,莫海鸿. 水位下降对地铁盾构隧道的影响分析[J]. 现代隧道技术, 2008(S1):207-210.LIU Tingjin, DENG Feihuang, MO Haihong. Effect of Water Level Dropped to Metro Shield Tunnel[J]. Modern Tunnelling Technology, 2008(S1):207-210.
[11] 谢康和,柳崇敏,应宏伟,等. 成层土中基坑开挖降水引起的地表沉降分析[J].浙江大学学报(工学版),2002, 36(3):239-251.XIE Kanghe, LIU Chongmin, YING Hongwei, et al. Analysis of Settlement Induced by Dewatering During Excavation in Layered Soil[J]. Journal of Zhejiang University (Engineering Science), 2002, 36(3):239-251.
[12] 周健,屠洪权,缪俊发. 地下水位与环境岩土工程[M]. 上海:同济大学出版社, 1995:1-333.
[13] 方云,林彤,谭林松. 土力学[M].武汉:中国地质大学出版社, 2003:1-227.
[14] 张桓,张子新. 盾构隧道开挖引起既有管线的竖向变形[J].同济大学学报(自然科学版),2013,41(8):1172-1178.ZHANG Huan, ZHANG Zixin.Vertical Deflection of Existing Pipeline due to Shield Tunneling[J]. Journal of Tongji University (Natural Science), 2013,41(8):1172-1178.
[15] 李文广. 邻近基坑降水对运营地铁隧道纵向变形的影响研究[D].上海:同济大学,2008:68-90.
[16] 吉茂杰,陈登峰. 基坑工程影响隧道位移的施工工艺控制方法[J].中国市政工程, 2001(2):36-39.JI Maojie, CHEN Dengfeng. Control of Foundation Pit Construction Causing Tunnel Displacement[J]. China Municipal Engineering,2001(2):36-39.
[2] 温锁林. 近距离上穿运营地铁隧道的基坑明挖施工控制技术[J]. 岩土工程学报,2010,32(2):451-454.WEN Suolin. Construction Technology of Deep Open Excavation above Running Metro Tunnels[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(2):1067-1082.
[3] 闫静雅. 邻近运营地铁隧道的深基坑设计施工浅谈[J]. 岩土工程学报,2010,32(7):234-237.YAN Jingya. Design and Construction of Deep Foundation Pits Near Metro Tunnels[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(7):234-237.
[4] 姜兆华,张永兴. 基坑开挖对邻近隧道纵向位移影响的计算方法[J].土木建筑与环境工程,2013,35(1):7-11.JIANG Zhaohua, ZHANG Yongxing. Calculation of Influence on Longitudinal Deformation of Adjacent Tunnels due to Excavation[J]. Journal of Civil, Architectural and Environmental Engineering, 2013, 35(1):7-11.
[5] 黄义,何芳社. 弹性地基上的梁、板、壳[M].北京:科学出版社,2005:1-181.
[6] 王聚山. 基于布西奈斯克及明德林解答的复合地基附加应力解析法探讨[J].铁道建筑,2006,46(8):75-78.WANG Jushan. Discussionof Analytical Method of Additional Stress Based on Boussinesq and Mindlin Solution in Composite Foundation[J]. Railway Engineering, 2006,46(8):75-78.
[7] 刘运生. 深大型基坑降水引起地铁隧道沉降的控制措施分析[J].土工基础,2013,27(1):8-11.LIU Yunsheng. Control Measures of Subway Tunnel Settlement Caused by Deep Pit Excavation[J].Geotechnical Foundation, 2013, 27(1):8-11.
[8] 张明,潘炳玉. 基坑施工降水对邻近地铁隧道的影响[J].科学技术与工程,2013,13(21):6164-6170.ZHANG Ming, PAN Bingyu. Pit Dewatering Impact on the Adjacent Subway Tunnel[J]. Science Technology and Engineering, 2013, 13(21):6164-6170.
[9] 贾媛媛, 路军富, 魏龙海,等. 隧道降水施工对既有市政管线隧道影响研究[J]. 水文地质工程地质, 2010, 37(6):43-48.JIA Yuanyuan, LU Junfu, WEI Longhai, et al. Effect of Tunnel Dewatering on the Existing Municipal Pipeline[J]. Hydrogeology and Engineering Geology, 2010, 37(6):43-48.
[10] 刘庭金,邓飞皇,莫海鸿. 水位下降对地铁盾构隧道的影响分析[J]. 现代隧道技术, 2008(S1):207-210.LIU Tingjin, DENG Feihuang, MO Haihong. Effect of Water Level Dropped to Metro Shield Tunnel[J]. Modern Tunnelling Technology, 2008(S1):207-210.
[11] 谢康和,柳崇敏,应宏伟,等. 成层土中基坑开挖降水引起的地表沉降分析[J].浙江大学学报(工学版),2002, 36(3):239-251.XIE Kanghe, LIU Chongmin, YING Hongwei, et al. Analysis of Settlement Induced by Dewatering During Excavation in Layered Soil[J]. Journal of Zhejiang University (Engineering Science), 2002, 36(3):239-251.
[12] 周健,屠洪权,缪俊发. 地下水位与环境岩土工程[M]. 上海:同济大学出版社, 1995:1-333.
[13] 方云,林彤,谭林松. 土力学[M].武汉:中国地质大学出版社, 2003:1-227.
[14] 张桓,张子新. 盾构隧道开挖引起既有管线的竖向变形[J].同济大学学报(自然科学版),2013,41(8):1172-1178.ZHANG Huan, ZHANG Zixin.Vertical Deflection of Existing Pipeline due to Shield Tunneling[J]. Journal of Tongji University (Natural Science), 2013,41(8):1172-1178.
[15] 李文广. 邻近基坑降水对运营地铁隧道纵向变形的影响研究[D].上海:同济大学,2008:68-90.
[16] 吉茂杰,陈登峰. 基坑工程影响隧道位移的施工工艺控制方法[J].中国市政工程, 2001(2):36-39.JI Maojie, CHEN Dengfeng. Control of Foundation Pit Construction Causing Tunnel Displacement[J]. China Municipal Engineering,2001(2):36-39.