地基基礎檢測 技術 Theoretical knowledge of shallow plate load tests for foundation testing technology II-淺層 平板載荷試驗理論知識65課件講解

地基基礎檢測技術淺層平板載荷試驗理論知識(二)

Theoreticalknowledgeofshallowplateloadtestsforfoundationtestingtechnology(II)設備儀器及其安裝

Equipmentandinstrumentsandtheirinstallation010101設備儀器及其安裝

Equipmentandinstrumentsandtheirinstallation1.反力裝置

1.Reactiondevice壓重平臺反力裝置

Reactiondeviceofballastplatform設備儀器及其安裝

Equipmentandinstrumentsandtheirinstallation提供的反力不得小于最大加載量的1.2倍

Thereactionprovidedshallnotbelessthan1.2timesofmaximumloadingcapacity應對其主要受力構(gòu)件進行強度和變形驗算

Checkingcalculationsshallbeperformedonstrengthanddeformationofitsmainload-bearingmember壓重應在試驗前一次加足

Theballastshallbefullyaddedatonetimebeforethetest施加于地基的壓應力不宜大于地基承載力特征值的1.5倍

Thecompressivestressappliedtothefoundationshallnotbegreaterthan1.5timesthecharacteristicvalueofthebearingcapacityofthefoundation壓重平臺反力裝置

Reactiondeviceofballastplatform壓重平臺反力裝置應符合下列規(guī)定:

Thereactiondeviceofballastplatformshallmeetthefollowingrequirements:1.反力裝置

1.Reactiondevice設備儀器及其安裝

Equipmentandinstrumentsandtheirinstallation為什么說加載反力裝置能提供的反力不得小于最大加載量的1.2倍?

Whyisitthattheloadingreactiondeviceshallbecapableofprovidingareactionnotlessthan1.2timesofmaximumloadingcapacity?主要是考慮平臺重心相對于千斤頂軸心的偏心影響可能造成的傾斜。

Thepossibleinclinationcausedbytheeccentricityoftheplatformcenterofgravityrelativetothejackaxisismainlyconsidered.1.反力裝置

1.Reactiondevice巖基載荷試驗

Rockfoundationloadtest為什么壓重應在試驗前一次加足?

Whyshouldtheballastbefullyaddedatonetimebeforethetest?加載反力裝置應優(yōu)先選用壓重平臺反力裝置。與樁的靜載試驗相比，平板載荷試驗的試驗荷載要小得多，因此，要求壓重應在試驗前一次加足。

Thereactiondeviceofballastplatformshallbepreferredforloadingreactiondevice.Theplateloadtesthasamuchsmallertestloadthanthestaticloadtestofthepile.Therefore,itisrequiredthattheballastshouldbefullyaddedatonetimebeforethetest.1.反力裝置

1.Reactiondevice巖基載荷試驗

Rockfoundationloadtest為什么說壓重平臺支墩施加于地基的壓應力不宜大于地基承載力特征值的1.5倍?

Whyshouldthecompressivestressappliedtothefoundationbythebuttressoftheballastplatformnotbegreaterthan1.5timesthecharacteristicvalueofthebearingcapacityofthefoundation?考慮壓重平臺施加于支墩地基的荷載不超過地基承載力極限值。因為試驗措施為臨時措施，所以沒必要要求小于特征值，以減少試驗準備的工作量。

Itisconsideredthattheloadappliedbytheballastplatformonthebuttressfoundationdoesnotexceedthelimitvalueofthebearingcapacityofthefoundation.Becausethetestmeasuresaretemporary,itisnotnecessarytorequirelessthanthecharacteristicvaluetoreducetheworkloadoftestpreparation.1.反力裝置

1.Reactiondevice設備儀器及其安裝

Equipmentandinstrumentsandtheirinstallation2.荷重測量裝置

2.Loadmeasuringdevice直接測定

Directlymeasuretheload形式一

TypeI測定油壓，根據(jù)干斤頂率定曲線換算荷載

Measuretheoilpressureandtheloadshallbeconvertedaccordingtothejackratingcurve形式二

TypeII設備儀器及其安裝

Equipmentandinstrumentsandtheirinstallation3.位移量測裝置

3.Displacementmeasuringdevice或

or位移傳感器

Displacementsensor大量程百分表

Longrangedialgauge設備儀器及其安裝

Equipmentandinstrumentsandtheirinstallation3.位移量測裝置

3.DisplacementmeasuringdeviceS>0.5m2安裝數(shù)量

InstallationQuantity位移測

Displacementmeasuring量儀表

instrument位移測

Displacementmeasuring量儀表

instrumentS≤0.5m2位移傳感器或大量程百分表安裝應符合下列規(guī)定：

Theinstallationofdisplacementsensororlongrangedialindicatorshallmeetthefollowingrequirements:承壓板

Bearingplate承壓板

Bearingplate設備儀器及其安裝

Equipmentandinstrumentsandtheirinstallation3.位移量測裝置

3.Displacementmeasuringdevice位移傳感器或大量程百分表安裝應符合下列規(guī)定：

Theinstallationofdisplacementsensororlongrangedialindicatorshallmeetthefollowingrequirements:承壓板

Bearingplate承壓板

Bearingplate位于承壓板每邊中點

Atthemidpointofeachsideofthebearingplate宜為25mm~50mm

Shallbe25mm~50mm設備儀器及其安裝

Equipmentandinstrumentsandtheirinstallation基準樁和基準梁應具有一定的剛度

Thereferencepileandreferencebeamshallhaveacertainstiffness3.位移量測裝置

3.Displacementmeasuringdevice基準梁的一端應固定在基準樁上

Oneendofthereferencebeamshallbefixedtothereferencepile另一端應簡支于基準樁上

Theotherendshallbesimplysupportedonthereferencepile設備儀器及其安裝

Equipmentandinstrumentsandtheirinstallation3.位移量測裝置

3.Displacementmeasuringdevice固定和支撐位移測量儀表的夾具及基準梁應避免太陽照射、振動及其他外界因素的影響。

Fixtureforfixingandsupportingdisplacementmeasuringinstrumentandreferencebeamshallavoidtheinfluenceofsunlight,vibrationandotherexternalfactors.設備儀器及其安裝

Equipmentandinstrumentsandtheirinstallation4.儀器設備性能指標

4.PerformanceIndicatorsoftheInstrumentsandEquipment試驗儀器設備性能指標應符合下列規(guī)定：

Theperformanceindicatorsofthetestinstrumentsandequipmentshallmeetthefollowingrequirements:壓力傳感器的測量誤差不應大于1%，壓力表精度應優(yōu)于或等于0.4級；

Themeasurementerrorofthepressuresensorshallnotbegreaterthan1%,andtheaccuracyofthepressuregaugeshallbebetterthanorequaltograde0.4;試驗用千斤頂、油泵、油管在最大試驗荷載時的壓力不應超過規(guī)定工作壓力的80%。

Thepressureofjack,oilpumpandoilpipefortestundermaximumtestloadshallnotexceed80%ofthespecifiedworkingpressure.設備儀器及其安裝

Equipmentandinstrumentsandtheirinstallation4.儀器設備性能指標

4.PerformanceIndicatorsoftheInstrumentsandEquipment試驗儀器設備性能指標應符合下列規(guī)定：

Theperformanceindicatorsofthetestinstrumentsandequipmentshallmeetthefollowingrequirements:荷重傳感器、千斤頂、壓力表或壓力傳感器的量程不應大于最大加載量的3.0倍，且不應小于最大加載量的1.2倍；

Therangeofloadsensor,jack,pressuregaugeorpressuresensorshallnotbegreaterthan3.0timesofthemaximumloadingcapacityandshallnotbelessthan1.2timesofthemaximumloadingcapacity;位移測量儀表的測量誤差不應大于0.1%FS，分辨力應優(yōu)于或等于0.01mm。

Themeasurementerrorofdisplacementmeasuringinstrumentshallnotbegreaterthan0.1%offullscale,andtheresolutionshallbebetterthanorequalto0.01mm.設備儀器及其安裝

Equipmentandinstrumentsandtheirinsta