超载对淤泥质地层隧道结构受力性能影响分析——以苏通GIL综合管廊越江盾构隧道为例
|
摘要
依托苏通GIL综合管廊越江盾构隧道,针对运营期岸坡段可能出现的地表超载问题,文章通过建立三维有限元精细化分析模型,研究了不同超载形式下管片结构的变形与裂损特征,分析了断面收敛变形、接缝张开、结构内力随堆载的发展规律,揭示了大面积堆载、局部堆载两种超载模式下结构的损伤演化机理,提出了地表超载控制标准。针对穿越淤泥质粉质粘土的大直盾构隧道,研究表明:(1)大面积堆载工况下隧道变形破坏过程分为三个阶段,分别以设计荷载、拱腰内侧钢筋受压屈服为分界点,第一阶段表现为弹性受力,第二阶段为带裂缝工作的塑性阶段,第三阶段为加速变形失稳阶段,破坏时表现为拱腰受压屈服,竖向收敛为110.5 mm,接缝基本未张开;(2)局部堆载工况下隧道受力同样分为弹性、塑性及加速变形失稳三个阶段,分别以设计荷载、拱腰外侧钢筋受拉屈服为分界点,破坏表现为顶底受拉破坏,竖向收敛152.6 mm,接缝张开4.36 mm;(3)大面积堆载模式下地表附加荷载的预警值为110 kPa,局部堆载模式下地表附加荷载的预警值为70 kPa。
Based on the Sutong GIL utility tunnel project, which is constructed by the shield machine under the river, and as for the overloading problem at the river bank slope during operating period, the refined threedimensional finite element model was established to study the deformation and cracking characteristics of the tunnel segment structure under different forms of overloading. The evolution laws of section convergence, joint opening and structural stress were analyzed, and the structure damage mechanisms were revealed under conditions of large area loading and local loading. The surface-surcharge control standard was proposed. For the big diameter shield tunneling crossing the silty clay, the research results show that:(1) the deformation failure process is divided into three stages under large area loading condition, taking the design load and compressive yield of rebars inside haunch as the critical points respectively. The first stage is characterized by the elastic stress, the second stage is in plastic state with fracture, and the third stage is accelerating deformation and instability stage. The vertical convergence is 110.5 mm with no opening of joints when rebars are yielded;(2)the deformation failure process under local loading condition is also divided into elasticity, plasticity and instability stages, taking the design load and tensile yield of rebars outside haunch as the critical points respectively. The vertical convergence is 152.6 mm with joint opening of 4.36 mm;(3) the early-warning values of additional stress on the ground under conditions of large area loading and local loading are 110 kPa and 70 kPa respectively.
Based on the Sutong GIL utility tunnel project, which is constructed by the shield machine under the river, and as for the overloading problem at the river bank slope during operating period, the refined threedimensional finite element model was established to study the deformation and cracking characteristics of the tunnel segment structure under different forms of overloading. The evolution laws of section convergence, joint opening and structural stress were analyzed, and the structure damage mechanisms were revealed under conditions of large area loading and local loading. The surface-surcharge control standard was proposed. For the big diameter shield tunneling crossing the silty clay, the research results show that:(1) the deformation failure process is divided into three stages under large area loading condition, taking the design load and compressive yield of rebars inside haunch as the critical points respectively. The first stage is characterized by the elastic stress, the second stage is in plastic state with fracture, and the third stage is accelerating deformation and instability stage. The vertical convergence is 110.5 mm with no opening of joints when rebars are yielded;(2)the deformation failure process under local loading condition is also divided into elasticity, plasticity and instability stages, taking the design load and tensile yield of rebars outside haunch as the critical points respectively. The vertical convergence is 152.6 mm with joint opening of 4.36 mm;(3) the early-warning values of additional stress on the ground under conditions of large area loading and local loading are 110 kPa and 70 kPa respectively.
引文
[1]肖明清.我国水下盾构隧道代表性工程与发展趋势[J].隧道建设,2018,38(3):360-371.XIAO Mingqing.Representative Engineering and Development Trend of China's Underwater Shield Tunnel[J].Tunnel Construction,2018,38(3):360-371.
[2]王涛,李浩,徐日庆.上方大面积加(卸)载引起盾构隧道的变形分析[J].现代交通技术,2008,5(3):29-37.WANG Tao,LI Hao,XU Riqing.Deformation Analysis of Shield Tunnel Caused by Large Area Loading(Unloading)Above[J].Modern Transportation Technology,2008,5(3):29-37.
[3]魏新江,洪文强,魏纲,俞国骅.堆载引起临近地铁隧道的转动与错台变形计算[J].岩石力学与工程学报,2018,37(5):1281-1289.WEI Xinjiang,HONG Wenqiang,WEI Gang,YU Guohua.Calculation of Rotation and Abutment Deformation Caused by Stacking in Adjacent Subway Tunnels[J].Journal of Rock Mechanics and Engineering,2018,37(5):1281-1289.
[4]柳献,张浩立,鲁亮,王秀志.超载工况下盾构隧道结构承载能力的试验研究[J].地下工程与隧道,2013,(4):10-15.LIU Xian,ZHANG Haoli,LU Liang,WANG Xiuzhi.Experimental Study on the Bearing Capacity of Shield Tunnel Structure under Overload Conditions[J].Underground Engineering and Tunnel,2013,(4):10-15.
[5]吴庆,杜守继.地面堆载对既有盾构隧道结构影响的试验研究[J].地下空间与工程学报,2014,10(1):57-66.WU Qing,DU Shouji.Experimental Study on the Influence of Ground Stacking on the Structure of Existing Shield Tunnel[J].Chinese Journal of Underground Space and Engineering,2014,10(1):57-66.
[6]王如路,张冬梅.超载作用下软土盾构隧道横向变形机理及控制指标研究[J].岩土工程学报,2013,35(6):1092-1101.WANG Rulu,ZHANG Dongmei.Study on Lateral Deformation Mechanism and Control Indexes of Soft Soil Shield Tunnel under Overloading[J].Journal of Geotechnical Engineering,2013,35(6):1092-1101.
[7]黄大维,周顺华,赖国泉,冯青松,柳林芽.地表超载作用下盾构隧道劣化机理与特性[J].岩土工程学报,2017,39(7):1173-1181.HUANG Dawei,ZHOU Shunhua,LAI Guoquan,FENG Qingsong,LIU Linya.Deterioration Mechanism and Characteristics of Shield Tunnel under Surface Overloading[J].Journal of Geotechnical Engineering,2017,39(7):1173-1181.
[8]吕连勋,李廷春,陈伟,孙捷城.地面超载条件下覆跨比对浅埋对到稳定性的影响[J].河南大学学报,2015,45(3):373-378.LV Lianxun,LI Tingchun,CHEN Wei,SUN Jiecheng.Effects of Overburden Ratio on the Stability of Shallow Burial under Overburden Conditions[J].Journal of Henan University,2015,45(3):373-378.
[9]邵华,黄宏伟,张东明,王如路.突发堆载引起软土地铁盾构隧道大变形整治研究[J].岩土工程学报,2016,38(6):1036-1043.SHAO Hua,HUANG Hongwei,ZHANG Dongming,WANG Rulu.Study on Large Deformation of Underground Shield Tunnel in Soft Soil Caused by Sudden Surcharge Loading[J].Journal of Geotechnical Engineering,2016,38(6):1036-1043.
[10]中铁第四勘察设计院集团有限公司.淮南-南京-上海1000千伏交流特高压输变电工程苏通GIL管廊工程初步设计隧道段岩土工程勘察报告[R].2017.China Railway Siyuan Survey and Design Institute Group Co.,LTD.The Geotechnical Engineering Investigation Report of Preliminary Design Tunnel Section of Sutong GIL Utility Yunnel Engineering of Huainan-Nanjing-Shanghai 1000 kV ACUHY Power Transmission and Transformation Project[R].2017.
[2]王涛,李浩,徐日庆.上方大面积加(卸)载引起盾构隧道的变形分析[J].现代交通技术,2008,5(3):29-37.WANG Tao,LI Hao,XU Riqing.Deformation Analysis of Shield Tunnel Caused by Large Area Loading(Unloading)Above[J].Modern Transportation Technology,2008,5(3):29-37.
[3]魏新江,洪文强,魏纲,俞国骅.堆载引起临近地铁隧道的转动与错台变形计算[J].岩石力学与工程学报,2018,37(5):1281-1289.WEI Xinjiang,HONG Wenqiang,WEI Gang,YU Guohua.Calculation of Rotation and Abutment Deformation Caused by Stacking in Adjacent Subway Tunnels[J].Journal of Rock Mechanics and Engineering,2018,37(5):1281-1289.
[4]柳献,张浩立,鲁亮,王秀志.超载工况下盾构隧道结构承载能力的试验研究[J].地下工程与隧道,2013,(4):10-15.LIU Xian,ZHANG Haoli,LU Liang,WANG Xiuzhi.Experimental Study on the Bearing Capacity of Shield Tunnel Structure under Overload Conditions[J].Underground Engineering and Tunnel,2013,(4):10-15.
[5]吴庆,杜守继.地面堆载对既有盾构隧道结构影响的试验研究[J].地下空间与工程学报,2014,10(1):57-66.WU Qing,DU Shouji.Experimental Study on the Influence of Ground Stacking on the Structure of Existing Shield Tunnel[J].Chinese Journal of Underground Space and Engineering,2014,10(1):57-66.
[6]王如路,张冬梅.超载作用下软土盾构隧道横向变形机理及控制指标研究[J].岩土工程学报,2013,35(6):1092-1101.WANG Rulu,ZHANG Dongmei.Study on Lateral Deformation Mechanism and Control Indexes of Soft Soil Shield Tunnel under Overloading[J].Journal of Geotechnical Engineering,2013,35(6):1092-1101.
[7]黄大维,周顺华,赖国泉,冯青松,柳林芽.地表超载作用下盾构隧道劣化机理与特性[J].岩土工程学报,2017,39(7):1173-1181.HUANG Dawei,ZHOU Shunhua,LAI Guoquan,FENG Qingsong,LIU Linya.Deterioration Mechanism and Characteristics of Shield Tunnel under Surface Overloading[J].Journal of Geotechnical Engineering,2017,39(7):1173-1181.
[8]吕连勋,李廷春,陈伟,孙捷城.地面超载条件下覆跨比对浅埋对到稳定性的影响[J].河南大学学报,2015,45(3):373-378.LV Lianxun,LI Tingchun,CHEN Wei,SUN Jiecheng.Effects of Overburden Ratio on the Stability of Shallow Burial under Overburden Conditions[J].Journal of Henan University,2015,45(3):373-378.
[9]邵华,黄宏伟,张东明,王如路.突发堆载引起软土地铁盾构隧道大变形整治研究[J].岩土工程学报,2016,38(6):1036-1043.SHAO Hua,HUANG Hongwei,ZHANG Dongming,WANG Rulu.Study on Large Deformation of Underground Shield Tunnel in Soft Soil Caused by Sudden Surcharge Loading[J].Journal of Geotechnical Engineering,2016,38(6):1036-1043.
[10]中铁第四勘察设计院集团有限公司.淮南-南京-上海1000千伏交流特高压输变电工程苏通GIL管廊工程初步设计隧道段岩土工程勘察报告[R].2017.China Railway Siyuan Survey and Design Institute Group Co.,LTD.The Geotechnical Engineering Investigation Report of Preliminary Design Tunnel Section of Sutong GIL Utility Yunnel Engineering of Huainan-Nanjing-Shanghai 1000 kV ACUHY Power Transmission and Transformation Project[R].2017.