侧压力系数对盾构隧道管片衬砌受力及破坏形态的影响研究
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摘要
随着盾构隧道建设规模的增大,地层复杂性的特点越趋明显,侧压力系数作为一个重要的表征参数,直接决定着隧道衬砌结构荷载分布及量值,对隧道结构的受荷情况及长期力学特性影响显著。以狮子洋隧道工程为依托,采用相似模型试验的方法,对比分析了侧压力系数对管片衬砌结构力学特性及破坏模式的影响规律。研究结果表明:在一定范围内,随侧压力系数的增大,衬砌结构的承载能力得到了提高,结构达到临界失稳状态时的最大位移值减小,结构从局部出现宏观裂纹到发生整体失稳的过程变长;当侧压力系数较小时,以纵向裂纹为主,大部分集中在左、右拱腰位置,侧压力系数较大时,结构出现横向裂纹并呈逐渐增多的态势,裂纹逐渐向拱顶、拱底部位发展。
With the expansion of shield tunnel construction scale, the complexity of strata increases. Lateral pressure coefficient, as one of the important parameters which characterize the complexity of strata, decides directly the load distribution and magnitude of tunnel lining, thereby significantly affecting the tunnel structure's loading and its long-term mechanical properties. Based on the case study of Shiziyang Shield Tunnel project, the method of model test was used to analyze the influence of lateral pressure coefficient on the mechanical characteristics and failure modes of segment lining structure. The research results show that while lateral pressure coefficient increases within a certain range, the segment lining structure's carrying capacity enhances. The maximum displacement at the critical stable point decreases and the process of the structure from the occurrence of local macroscopic crack to overall instability is prolonged. When the lateral pressure coefficient is small, longitudinal cracks mainly take place, concentrating on the left and right haunch position. When the lateral pressure coefficient is large, the structure suffers transverse cracks which tend to increase. The cracks gradually spread to the vault and arch bottom.
With the expansion of shield tunnel construction scale, the complexity of strata increases. Lateral pressure coefficient, as one of the important parameters which characterize the complexity of strata, decides directly the load distribution and magnitude of tunnel lining, thereby significantly affecting the tunnel structure's loading and its long-term mechanical properties. Based on the case study of Shiziyang Shield Tunnel project, the method of model test was used to analyze the influence of lateral pressure coefficient on the mechanical characteristics and failure modes of segment lining structure. The research results show that while lateral pressure coefficient increases within a certain range, the segment lining structure's carrying capacity enhances. The maximum displacement at the critical stable point decreases and the process of the structure from the occurrence of local macroscopic crack to overall instability is prolonged. When the lateral pressure coefficient is small, longitudinal cracks mainly take place, concentrating on the left and right haunch position. When the lateral pressure coefficient is large, the structure suffers transverse cracks which tend to increase. The cracks gradually spread to the vault and arch bottom.
引文
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[16] 郭瑞,何川,封坤,等.弱抗力地层盾构隧道失稳破坏的模型试验研究[J].铁道学报,2015,37(3):72-78.GUO Rui,HE Chuan,FENG Kun,et al.Model Test Study on Instability Failure of Shield Tunnel under Weak Resistance Strata[J].Journal of the China Railway Society,2015,37(3):72-78.
[17] 王士民,申兴柱,何祥凡,等.不同拼装方式下盾构隧道管片衬砌受力与破坏模式模型试验研究[J].土木工程学报,2017,50(6):114-124.WANG Shimin,SHEN Xingzhu,HE Xiangfan,et al.A Model Test for the Mechanical Property and Failure Mode of Lining Segments with Different Assembly Types of Shield Tunnel[J].China Civil Engineering Journal,2017,50(6):114-124.
[18] CHEN J S,MO H H.Numerical Study on Crack Problems in Segments of Shield Tunnel using Finite Element Method[J].Tunnelling and Underground Space Technology,2009,24(1):91-102.
[19] 郭瑞.盾构隧道管片衬砌结构稳定性问题研究[D].成都:西南交通大学,2014.
[20] 王士民,于清洋,彭博,等.空洞对盾构隧道结构受力与破坏影响模型试验研究[J].岩土工程学报,2017,39(1):89-98.WANG Shimin,YU Qingyang,PENG Bo,et al.Model Tests on Influences of Cavity Defects on Mechanical Characteristics and Failure Laws of Segment Linings of Shield Tunnels[J].Chinese Journal of Geotechnical Engineering,2017,39(1):89-98.
[2] 申兴柱.盾构隧道双层衬砌结构力学特性研究[D].成都:西南交通大学,2018.
[3] 梁英俊.土层侧压力系数试验测定及其对盾构管片内力的影响分析[D].北京:北京交通大学,2011.
[4] 杨征.武汉长江隧道大型管片衬砌结构力学特征研究[D].成都:西南交通大学,2007.
[5] 周济民.水下盾构法隧道双层衬砌结构力学特性[D].成都:西南交通大学,2012.
[6] ANGELO C,ALBERTO M,ZILA R,et al.Structural Behavior of Precast Tunnel Segments in Fiber Reinforced Concrete[J].Tunnelling and Underground Space Technology,2011,26(2):284-291.
[7] 封坤,何川,苏宗贤.南京长江隧道原型管片结构破坏试验研究[J].西南交通大学学报,2011,46(8):564-571.FENG Kun,HE Chuan,SU Zongxian.Prototype Test on Failure Characteristics of Segmental Lining Structure for Nanjing Yangtze River Tunnel[J].Journal of Southwest Jiaotong University,2011,46(8):564-571.
[8] 何川,张建刚,苏宗贤.大断面水下盾构隧道结构力学特性[M].北京:科学出版社,2010.
[9] 毕湘利,柳献,王秀志,等.通缝拼装盾构隧道结构极限承载力的足尺试验研究 [J].土木工程学报,2014,47(10):117-127.BI Xiangli,LIU Xian,WANG Xiuzhi ,et al.Experimental Investigation on the Ultimate Bearing Capacity of Continuous-jointed Segmental Tunnel Linings[J].China Civil Engineering Journal,2014,47(10):117-127.
[10] 毕湘利,柳献,王秀志,等.内张钢圈加固盾构隧道结构极限承载力的足尺试验研究[J].土木工程学报,2014,47(11):128-137.BI Xiangli,LIU Xian,WANG Xiuzhi,et al.Experimental Study on the Ultimate Load-bearing Capacity of Deformed Segmental Tunnel Linings Strengthened by Steel Plates[J].China Civil Engineering Journal,2014,47(11):128-137.
[11] 董新平.盾构衬砌整环破坏机理研究[J].岩土工程学报,2014,36(3):417-426.DONG Xinping.Failure Mechanism of the Full-ring for Segmented Tunnel Lining[J].Chinese Journal of Geotechnical Engineering,2014,36(3):417-426.
[12] 董新平.盾构衬砌单环破坏历程的增量法解析解[J].岩土工程学报,2015,37(1):119-125.DONG Xinping.Incremental Analytical Solution for Failure History of a Single Ring of Segmented Tunnel Lining[J].Chinese Journal of Geotechnical Engineering,2015,37(1):119-125.
[13] 王士民,于清洋,彭博,等.水下盾构隧道管片衬砌结构渐进性破坏机理模型试验研究[J].土木工程学报,2016,49(4):111-120.WANG Shimin,YU Qingyang,PENG Bo,et al.A Model Test for the Progressive Failure Mechanism of Lining Segment Structure of Underwater Shield Tunnels[J].China Civil Engineering Journal,2016,49(4):111-120.
[14] 彭博.水下盾构隧道管片衬砌结构渐进性破坏机理研究[D].成都:西南交通大学,2015.
[15] 王士民,于清洋,彭博,等.封顶块位置对盾构隧道管片结构力学特征与破坏形态的影响分析[J].土木工程学报,2016,49(6):123-132.WANG Shimin,YU Qingyang,PENG Bo,et al.Analysis of Mechanical Characteristics and Failure Pattern of Shield Tunnel Segment Lining with Different Position of the Key Block[J].China Civil Engineering Journal,2016,49(6):123-132.
[16] 郭瑞,何川,封坤,等.弱抗力地层盾构隧道失稳破坏的模型试验研究[J].铁道学报,2015,37(3):72-78.GUO Rui,HE Chuan,FENG Kun,et al.Model Test Study on Instability Failure of Shield Tunnel under Weak Resistance Strata[J].Journal of the China Railway Society,2015,37(3):72-78.
[17] 王士民,申兴柱,何祥凡,等.不同拼装方式下盾构隧道管片衬砌受力与破坏模式模型试验研究[J].土木工程学报,2017,50(6):114-124.WANG Shimin,SHEN Xingzhu,HE Xiangfan,et al.A Model Test for the Mechanical Property and Failure Mode of Lining Segments with Different Assembly Types of Shield Tunnel[J].China Civil Engineering Journal,2017,50(6):114-124.
[18] CHEN J S,MO H H.Numerical Study on Crack Problems in Segments of Shield Tunnel using Finite Element Method[J].Tunnelling and Underground Space Technology,2009,24(1):91-102.
[19] 郭瑞.盾构隧道管片衬砌结构稳定性问题研究[D].成都:西南交通大学,2014.
[20] 王士民,于清洋,彭博,等.空洞对盾构隧道结构受力与破坏影响模型试验研究[J].岩土工程学报,2017,39(1):89-98.WANG Shimin,YU Qingyang,PENG Bo,et al.Model Tests on Influences of Cavity Defects on Mechanical Characteristics and Failure Laws of Segment Linings of Shield Tunnels[J].Chinese Journal of Geotechnical Engineering,2017,39(1):89-98.