BIM辅助多管线场地溶洞钻孔填充管控技术

BIM Assisted Control Technology for Drilling and Filling Karst Caves in Multi Pipeline Sites

为防止溶(土)洞发生塌陷及其他危害,地铁施工前对详勘已揭示的施工影响范围内的溶(土)洞进行提前预处理。在城区复杂环境市政道路下溶(土)洞密集的补勘、探边,钻孔易破坏市政管线,在钻孔探边完成后,溶洞钻注砂浆孔位时,也是根据单个补勘、探边柱状图的溶洞高度判断砂浆孔点位布置,无法将溶洞的原始填充状态和溶洞高度进行整体考虑,不能使砂浆孔布置在最优的溶洞填充区域,存在泵送砂浆时无法灌入的风险。而溶洞注浆量填充的标准也是通过实际注浆量达到溶洞理论注浆量的百分比后再进行分析,采取应对措施,没能形成溶洞注浆量与注浆质量在事前、事中的有效管控。针对上述问题,通过无人机倾斜摄影还原施工场地原始地貌、建立与现场一致的地下管线模型,将溶洞补勘、探边钻孔与原始地貌模型、地下管线模型整合,核对钻孔与地面障碍物,钻孔与地下管线的位置关系,从而调整钻孔位置。建立溶洞原始填充状态模型与砂浆钻孔位置进行核对,将砂浆孔和排气孔调整至砂浆填充最优位置,进行灌填。通过真实统计的溶洞灌注砂浆量与模拟砂浆流动状态,对溶洞砂浆填充量和填充质量进行管控。

To prevent the collapse and other hazards of karst(soil)caves,prior to the construction of subway civil engineering projects,the karst(soil)caves,which are revealed in the detailed survey and are within the scope of construction influence,have been treated in advance.In the complex urban environment of municipal roads with dense karst(soil)caves for supplementary exploration and edge exploration,drilling can easily damage municipal pipelines.After the completion of drilling and edge exploration,when drilling and injecting mortar holes into karst caves,the location of mortar holes is also determined based on the height of individual supplementary exploration and edge exploration columns.The original filling state of the cave and the height of the cave cannot be considered as a whole,and the mortar hole cannot be arranged in the optimal cave filling area,and there is a risk that the mortar cannot be poured when pumping mortar.The standard of grouting volume for karst caves is also analyzed after the actual grouting volume reaches the percentage of the theoretical grouting volume for karst caves,and corresponding measures are taken.However,effective control of grouting volume and grouting quality in karst caves has not been achieved in advance or during the process.In response to the above problems,through UAV oblique photography,the original landform of the construction site was restored,and the underground pipeline model consistent with the site was established.The karst cave supplementary exploration and exploration drilling were integrated with the original landform model and the underground pipeline model,and the position relationship between the drilling hole and the ground obstacle,the drilling hole and the underground pipeline was checked to adjust the drilling position.The original filling state model of the karst cave was established to check with the position of mortar drilling,and the mortar hole and vent hole were adjusted to the optimal position of mortar filling for filling.Through the real statistics of the amount of grouting mortar in the cave and the simulation of the flow state of the mortar,the filling amount and filling quality of the mortar in the cave are controlled.