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1、工程土方量測算精度的主要影響因素分析阮曉光談秋英浙江公路技師學院摘要:為研宄三維地形碎部點平均間距、格網(wǎng)間距等因素對工程土方量測量計算過程屮的精度影響,主要通過TLS技術(TerrestrialLaserScanningTechnology,地面三維激光掃描技術)采集數(shù)據(jù)完整、圖形規(guī)則、坡度分布均勻的22塊大比例尺數(shù)字地形區(qū)域,以此作為土方量計算的基礎數(shù)據(jù),分析不同碎部點平均間距、格網(wǎng)間距對土方量精度的影響,得出如下結論:(1)碎部點間距或碎部點密度是影響土方量精度的最主要因素,實際工程屮可根據(jù)土方量限差要求推求較為適宜的碎部點
2、間距,以提高工作效率,降低生產(chǎn)成本。(2)TLS技術進行土方量測算,點云數(shù)據(jù)抽稀到5m即可保證相當高的計算精度并兼顧計算效率;全站儀和GNSSRTK技術測算土方量,地形點間距不宜大于15m。(3)對于不同地形測繪技術和不同比例尺情況,土方量計算所選取的格網(wǎng)間距均不應大于10m。(4)航空攝影測量、全站儀和GNSSRTK技術測算工程土方量,須在地形變化復雜區(qū)域有意識地增大點密度,以彌補對地形變化描繪的不足。關鍵詞:上方量精度;碎部點間距;格網(wǎng)間距;TLS;作者簡介:阮曉光(1990-),男(漢族),河南周口人,碩士,講師.收稿曰期
3、:2017-01-26AnalysisonkeyfactorsofearthworkcalculationaccuracyRuanXiaoguangTanQiuyingZhejiangHighwayTechniciansCollege;Abstract:Inordertostudytheeffectoftheaverageintervalofthree-dimensionalterraindetailpointsandtheside-lengthofgridontheearthworkcalculationaccuracy,22
4、piecesoflargescaledigitalterrainregionswithcompletedata,regularshapeanduniformslopedistributionareacquiredmainlybyTLStechnology,andthenareusedasthebasedataofearthworkcalculation.Throughtheanalysisofearthworkcalculationaccuracywithdifferentaverageintervalofdetailpoint
5、andthegridside-length,itisconcludedthat:(1)Detailpointintervalorsamplingpointdensityisoneofthemostimportantfactorsaffectingearthworkcalculationaccuracy.Inpracticalengineering,thesuitabledetailpointintervalcanbecalculatedbytheearthworkerrorlimit,whichcanimproveefficie
6、ncyandreducecost.(2)WhenthepointclouddataacquiredbyTLStechnologyisdilutedto5meters,itcanensurerequirementsofaccuracyandefficiency-Topographicpointintervalshouldnotbegreaterthan15metersbytotalstationandRTKGNSStechnology-(3)Nomatterwhatkindoftopographicmappingtechnolog
7、yandscale,thegridside-lengthshouldbelessthan10meters.⑷Forearthworkcalculationbyaerialphotogrammetrictechnology,totalstationandRTKGNSStechnology,itneedstoconsciouslyincreasethedetai1pointdensityincomplexterrainchangearea,tomakeupfortheproblemsofterrainchanges.Keyword:
8、earthworkaccuracy;detailpointinterval;thesidelengthofgrid;TLS;Received:2017-01-260引言受實際工程土方外形的復雜性和不規(guī)則性影響,高精度的土方量計算結果往往很難獲取。尤其是大型土方工