轨道交通地下工程与深基坑风险控制培训班天津蓟县渔阳宾馆深基坑工程变形与稳定问题案例分析深基坑工程变形与稳定问题案例分析2011-3-11天津蓟县渔阳宾馆深基坑工程变形与稳定问题案例分析深基坑工程变形与稳定问题案例分析天津大学建筑工程学院郑刚建筑工程学院郑刚郑刚郑刚教授zhenggang1967@163.com18602683655天津大学建筑工程学院副院长天津大学建筑工程学院副院长中国建筑学会基坑工程专业委员会副主任委员中国建筑学会地基基础分会副理事长中国土力学及岩土工程学会常务理事中国建筑业协会深基础施工分会副理事长天津市建筑学会地基基础专业委员会副主任委员天津市建筑学会地基基础专业委员会副主任委员第一部分基坑与地程程险基坑与地下工程工程风险——典型工程案例分析典型工程案例分析程案例分析工程案例分析一——某深基坑地下连续墙渗漏抢险工程案例分析二——新奥尔良防洪墙坍塌事故•坐落于美国南部密西西比河岸的新奥尔良市,因密西西比河经常泛滥把大量的泥沙和淤泥堆积密西西比河经常泛滥,把大量的泥沙和淤泥堆积到了周围的湿地里。1927年的一次严重的洪灾夺去了300人的性命并使沿岸60万人无家可归在那去了300人的性命,并使沿岸60万人无家可归在那之后,新奥尔良市的市长便决定修建一座大堤来拦住河水这座有些地方高达75米的大堤可以在下住河水,这座有些地方高达75米的大堤可以在下大雨的时候挡住暴涨的河水。由于人们在这个地方筑起了长堤又排干了沼泽在把水从沼泽的方筑起了长堤,又排干了沼泽,在把水从沼泽的土壤中排出去之后,这些地方就开始下沉,导致新奥尔良市的某些地区比海平面低了6米多而且新奥尔良市的某些地区比海平面低了6米多,而且这座城市还在以每年9毫米的速度下沉工程案例分析三工程案例分析三新加坡地铁基坑坍塌——新加坡NicollHighway地铁基坑坍塌工程案例分析四工程案例分析四—杭州地铁湘湖站基坑坍塌•杭州地铁一号线的起点站湘湖站位于萧山湘湖杭州乐园西侧,风情大道东侧。如下图所示。车站场地位于杭州市钱塘江南岸的萧绍冲积平原,地貌主要为丘陵地貌和钱塘江河口冲海积地貌。•车站主体为地下两层三跨钢筋混凝土矩形框架结构,总长932m,宽21m,开挖15.7m~16.2m。围护结构采用800mm厚地下连续墙地连墙入土深度为1728m•围护结构采用800mm厚地下连续墙,地连墙入土深度为17.28m。•竖向设置4道钢管支撑(φ609钢管),中间设置立柱。根据施工需要,车站分为北一、北二、南一、南二等多期。•发生事故的为北二基坑,北二基坑长度为106m,宽20.5m。潜水水位位于地面以下0.5m左右,无承压水。62m灌入淤泥7.616.28m灌入淤泥后坑底1原坑底原坑底地连墙倾倒形态支撑水平间距约3mPFC2D3.10Step118318420:38:48WedMar232011VieSie支撑与地连墙无连接计算0步ViewSize:X:6.008e+000=6.797e+001Y:-6.124e+000=4.979e+001WllWallGroupNoneconnection3-rconnection3-lconnection2-rconnection2-lconnection1-rconnection1lconnection1-lbreakpointlayer3_mlayer5_mlayer4_mlayer2_mlayer1_mlayer4layer5layer1layer1layer3layer2PBondLocationsItascaConsultingGroup,Inc.Minneapolis,MNUSAPFC2D3.10Step168328422:45:51FriMar252011VieSie支撑与地连墙无连接计算50万步ViewSize:X:6.008e+000=6.797e+001Y:-6.551e+000=4.936e+001WllWallGroupNoneconnection3-rconnection3-lconnection2-rconnection2-lconnection1-rconnection1lconnection1-lbreakpointlayer3_mlayer5_mlayer4_mlayer2_mlayer1_mlayer4layer5layer1layer1layer3layer2PBondLocationsItascaConsultingGroup,Inc.Minneapolis,MNUSAPFC2D3.10Step218328422:43:00FriMar252011VieSie支撑与地连墙无连接计算100万步ViewSize:X:6.008e+000=6.797e+001Y:-6.551e+000=4.936e+001WllWallGroupNoneconnection3-rconnection3-lconnection2-rconnection1-rconnection1-lconnection2lconnection2-lbreakpointlayer3_mlayer5_mlayer4_mlayer2_mlayer1_mlayer4layer5layer1layer1layer3layer2PBondLocationsItascaConsultingGroup,Inc.Minneapolis,MNUSAPFC2D3.10Step268328422:43:02FriMar252011VieSie支撑与地连墙无连接计算150万步ViewSize:X:6.008e+000=6.797e+001Y:-6.551e+000=4.936e+001WllWallGroupNoneconnection3-rconnection3-lconnection2-rconnection1-rconnection1-lconnection2lconnection2-lbreakpointlayer3_mlayer5_mlayer4_mlayer2_mlayer1_mlayer4layer5layer1layer1layer3layer2PBondLocationsItascaConsultingGroup,Inc.Minneapolis,MNUSAPFC2D3.10Step318328422:43:03FriMar252011VieSie支撑与地连墙无连接计算200万步ViewSize:X:6.008e+000=6.797e+001Y:-6.551e+000=4.936e+001WllWallGroupNoneconnection3-rconnection3-lconnection2-rconnection1-rconnection1-lconnection2lconnection2-lbreakpointlayer3_mlayer5_mlayer4_mlayer2_mlayer1_mlayer4layer5layer1layer1layer3layer2PBondLocationsItascaConsultingGroup,Inc.Minneapolis,MNUSAPFC2D3.10Step368328422:43:04FriMar252011VieSie支撑与地连墙无连接计算250万步ViewSize:X:6.008e+000=6.797e+001Y:-6.551e+000=4.936e+001WllWallGroupNoneconnection3-rconnection3-lconnection2-rconnection1-rconnection1-lconnection2lconnection2-lbreakpointlayer3_mlayer5_mlayer4_mlayer2_mlayer1_mlayer4layer5layer1layer1layer3layer2PBondLocationsItascaConsultingGroup,Inc.Minneapolis,MNUSAPFC2D3.10Step418328422:43:05FriMar252011VieSie支撑与地连墙无连接计算300万步ViewSize:X:6.008e+000=6.797e+001Y:-6.551e+000=4.936e+001WllWallGroupNoneconnection3-rconnection3-lconnection2-rconnection1-rconnection1-lconnection2lconnection2-lbreakpointlayer3_mlayer5_mlayer4_mlayer2_mlayer1_mlayer4layer5layer1layer1layer3layer2PBondLocationsItascaConsultingGroup,Inc.Minneapolis,MNUSAPFC2D3.10Step468328422:43:07FriMar252011VieSie支撑与地连墙无连接计算350万步ViewSize:X:6.008e+000=6.797e+001Y:-6.551e+000=4.936e+001WllWallGroupNoneconnection3-rconnection3-lconnection2-rconnection1-rconnection1-lconnection2lconnection2-lbreakpointlayer3_mlayer5_mlayer4_mlayer2_mlayer1_mlayer4layer5layer1layer1layer3layer2PBondLocationsItascaConsultingGroup,Inc.Minneapolis,MNUSAPFC2D3.10Step518328422:43:08FriMar252011VieSie支撑与地连墙无连接计算400万步ViewSize:X:6.008e+000=6.797e+001Y:-6.551e+000=4.936e+001WllWallGroupNoneconnection3-rconnection2-rconnection1-rconnection1-lconnection2-lconnection3lconnection3-lbreakpointlayer3_mlayer5_mlayer4_mlayer2_mlayer1_mlayer4layer5layer1layer1layer3layer2PBondLocationsItascaConsultingGroup,Inc.Minneapolis,MNUSAPFC2D3.10Step568366122:45:14FriMar252011VieSie支撑与地连墙无连接计算450万步ViewSize:X:6.008e+000=6.797e+001Y:-6.551e+000=4.936e+001WllWallGroupNoneconnection2-rconnection1-lconnection1-rconnection3-rconnection2-lconnection3lconnection3-lbreakpointlayer3_mlayer5_mlayer4_mlayer2_mlayer1_mlayer4layer5layer1layer1layer3layer2PBondLocationsItascaConsultingGroup,Inc.Minneapolis,MNUSA9PFC2D3.10Step618318422:41:40FriMar252011VieSie支撑与地连墙刚接计算500万步ViewSize:X:6.008e+000=6.797e+001Y:-6.124e+000=4.979e+001WllWallGroupNoneco