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ID:23091990
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页数:15页
时间:2018-11-04
《工程土方量测算精度的主要影响因素分析》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、工程土方量测算精度的主要影响因素分析阮晓光谈秋英浙江公路技师学院摘要:为研宄三维地形碎部点平均间距、格网间距等因素对工程土方量测量计算过程屮的精度影响,主要通过TLS技术(TerrestrialLaserScanningTechnology,地面三维激光扫描技术)采集数据完整、图形规则、坡度分布均匀的22块大比例尺数字地形区域,以此作为土方量计算的基础数据,分析不同碎部点平均间距、格网间距对土方量精度的影响,得出如下结论:(1)碎部点间距或碎部点密度是影响土方量精度的最主要因素,实际工程屮可根据土方量限差要求推求较为适宜的碎部点
2、间距,以提高工作效率,降低生产成本。(2)TLS技术进行土方量测算,点云数据抽稀到5m即可保证相当高的计算精度并兼顾计算效率;全站仪和GNSSRTK技术测算土方量,地形点间距不宜大于15m。(3)对于不同地形测绘技术和不同比例尺情况,土方量计算所选取的格网间距均不应大于10m。(4)航空摄影测量、全站仪和GNSSRTK技术测算工程土方量,须在地形变化复杂区域有意识地增大点密度,以弥补对地形变化描绘的不足。关键词:上方量精度;碎部点间距;格网间距;TLS;作者简介:阮晓光(1990-),男(汉族),河南周口人,硕士,讲师.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引言受实际工程土方外形的复杂性和不规则性影响,高精度的土方量计算结果往往很难获取。尤其是大型土方工
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