隧道施工Tunnelconstruction任务四拱顶下沉.pptx

隧道施工

Tunnelconstruction;2;3;拱顶下沉量测概念

Conceptofvaultsubsidencemeasurement;量点布置—（一）测量断面间距

Layoutofmeasuringpoints-(I)measuringsectionspacing

;采用全断面开挖方式时：拱顶下沉测点设在拱顶轴线附近,见图(a）；

当采用台阶开挖方式时:拱顶下沉测点设在拱顶轴线附近，见图(b)；

Layoutofmeasuringpoints-(II)whenthefullsectionexcavationmethodisadoptedforthelaterallinelayout:themeasuringpointofarchcrownsubsidenceissetnearthearchcrownaxis,asshowninfigure(a);

Whenbenchexcavationisadopted:themeasuringpointofarchcrownsubsidenceissetneartheaxisofarchcrown,asshowninfigure(b);;当采用CD法或CRD施工时，拱项轴线左右两侧各设一拱顶下沉测点，见图(c)；

当采用侧壁导坑法施工时，在左右侧壁导坑拱顶各设一拱顶下沉测点；在开挖中部核土部分时，在拱项设一拱顶下沉测点；见图(d)。LayoutofWhenCDmethodorCRDmethodisadoptedforconstruction,onevaultsubsidencemeasuringpointissetontheleftandrightsidesofthearchaxis,asshowninfigure(c);

Whenthesidewallheadingmethodisadoptedforconstruction,onevaultsubsidencemeasuringpointshallbesetonthevaultoftheleftandrightsidewallheading;Whenexcavatingthecoresoilinthemiddle,setavaultsubsidencemeasuringpointonthearchitem;Seefigure(d).;量测实施—（一）测量过程

Measurementimplementation-(I)measurementprocess;量测实施—（一）测量过程

Measurementimplementation-(I)measurementprocess;测钩

Measuringhook;全站仪是无尺丈量，通过在测点处布置反射膜片。通过对比不同时刻的三维坐标值，获得该点的位移变化值，这种方法能够获取更全面三维位移数据，有利于结合现行的数值计算方法进行监控量测信息反馈。Thetotalstationisarulerfreemeasurementbyarrangingareflectiondiaphragmatthemeasuringpoint.Bycomparingthethree-dimensionalcoordinatevaluesatdifferenttimes,thedisplacementchangevalueofthepointisobtained.Thismethodcanobtainmorecomprehensivethree-dimensionaldisplacementdata,whichisconducivetomonitoringandmeasurementinformationfeedbackcombinedwiththecurrentnumericalcalculationmethods.;量测实施—（二）测量频率

Measurementimplementation-(II)measurementfrequency;数据记录

Datarecord;数据分析—（一）曲线分析

Dataanalysis-(I)curveanalysis;数据分析—（二）四种曲线状态

Dataanalysis-(