高精度三维地质建模技术在城市再生水厂深大基坑中的应用

Application of high-precision 3D geological modeling technology in deep and large foundation pits of urban reclaimed water plants

摘要

目前三维地质建模技术在岩土工程勘察中的应用大多停留在“可视化”阶段，难以充分发挥三维地质模型的优势。为研究钻探数据跨平台共享困难、三维地质属性模型精度不足等问题，依托北京市某再生水厂二期工程，利用EngeoCAD勘察软件的开放环境定向开发钻探数据接口；基于钻探数据、试验数据，构建地质体三维地质结构模型和高精度属性模型，并通过地质剖面对比以及轻型圆锥动力触探测试技术对模型应用进行验证。结果显示：利用开发的数据接口可以快速实现地质钻探数据从北京工程勘察云平台到二维勘察软件，再到专业三维地质建模软件的自动导入；经剖面对比分析，三维地质剖面与传统二维地质剖面地层在空间延展性上高度契合，仅部分透镜体及薄夹层尖灭点一致性稍差；经现场计量验证，三维地质模型解析的填土方量与传统方法估算的填土方量相对误差分别为3.85%、9.84%,三维地质模型计算精度优势明显；经实际开挖地层验证，属性模型识别的不良地层空间分布域与实际地层具有较高的吻合度。结果表明：开发的数据接口打通了数据“云时代”跨平台共享钻探数据卡口；属性模型实现了地质体对岩土体物理力学参数的集成，可以很好地支撑场地分区分段工程地质评价。

Abstract

The application of 3D geological modeling technology in geotechnical engineering investigation is mostly limited to the "visualization" stage, making it difficult to fully utilize the advantages of 3D geological models. To address issues such as the difficulty of cross-platform sharing of drilling data and insufficient precision of 3D geological attribute models, based on the Phase II project of a reclaimed water plant in Beijing, the open environment of EngeoCAD survey software is used to develop drilling data interface. Based on drilling data and test data, the 3D geological structure model and high-precision attribute model of geological body are constructed, and the application of the model is verified by geological profile comparison and light cone dynamic penetration test. The results show that: The developed data interface could quickly implement the automatic import of geological drilling data from the Beijing engineering investigation cloud platform to 2D survey software, and then to professional 3D geological modeling software. Through profile comparison and analysis, the 3D geological profile shows a high degree of spatial extension consistency with the traditional 2D geological profile strata, with only slight inconsistencies in some lens bodies and thin interlayer termination points. Field measurement validation shows that the relative error in the fill volume calculated by the 3D geological model and the traditional method is 3.85% and 9.84%, respectively, demonstrating a clear advantage in the calculation accuracy of the 3D geological model. Through actual excavation layer verification, the spatial distribution domain of poor strata identified by the attribute model matches the actual strata with high accuracy. The developed data interface has bridged the gap for cross-platform sharing of drilling data in the ‘Cloud Era'. The attribute model integrates physical and mechanical parameters of geotechnical bodies into geological modeling, effectively supporting the engineering geological evaluation of site zoning and segmentation.

关键词

三维地质建模 / 属性建模 / 室内试验 / 原位测试

Key words

3D geological modeling / attribute modeling / laboratory testing / in-situ testing

Author summay

曹春山(1977—), 男, 高级工程师, 博士, 主要从事岩土工程、工程地质与灾害地质方面的研究。E-mail: [e-mail]