隧道施工Tunnelconstruction任务五地表下沉.pptx

隧道施工

Tunnelconstruction;2;3;地表沉降量测概念

Conceptofsurfacesettlementmeasurement;浅埋隧道通常位于软弱、破碎、自稳时间极短的围岩中，施工方法不妥极易发生冒顶塌方或地表有害下沉，当地表有建筑物时会危及其安全。地表下沉量测实际上就是量测地面高程，多次测量求出的差值就是地表下沉值。

Shallowburiedtunnelsareusuallylocatedinweak,brokensurroundingrockswithveryshortselfstabilizationtime.Improperconstructionmethodsareverypronetoroofcollapseorharmfulsurfacesubsidence.Whentherearebuildingsonthesurface,theirsafetywillbeendangered.Surfacesubsidencemeasurementisactuallymeasuringthegroundelevation,andthedifferenceobtainedfrommultiplemeasurementsisthesurfacesubsidencevalue.;测量实施—（一）测点设置

Measurementimplementation-(I)measurementpointsetting;测量实施—（二）测点布置

Surveyimplementation-(II)layoutofsurveypoints;地表沉降测点纵向间距

Longitudinalspacingofsurfacesettlementmeasuringpoints;地表沉降测点横向间距为2—5m。在隧道中线附近测点应适当加密，隧道中线两侧量测范围不应小于H0+B，地表有控制性建(构)筑物时.量测范围应活当加宽。

Thehorizontalspacingofsurfacesettlementmeasuringpointsis2-5M.Themeasuringpointsnearthetunnelcenterlineshallbeproperlydensified,andthemeasuringrangeonbothsidesofthetunnelcenterlineshallnotbelessthanH0+B.whentherearecontrolledbuildings(structures)onthesurface,themeasuringrangeshallbewidened.;;量测断面距开挖面距离（m）

Distancebetweenmeasuredsectionandexcavationface(m);数据记录

Datarecord;;数据分析

Dataanalysis;;;敬业精神

Professionalism