雄安新区工程地质层组划分、三维地质结构构建及其在城市规划建设中的应用

韩博; 夏雨波; 马震; 王小丹; 郭旭; 林良俊; 裴艳东

doi:10.12029/gc20210305004

雄安新区工程地质层组划分、三维地质结构构建及其在城市规划建设中的应用

Division of engineering geological strata, building of 3D geological structure and its application in urban planning and construction in Xiong'an New Area

摘要

摘要:
研究目的 为了规范雄安新区工程地质层组划分，构建三维工程地质结构模型，更好地进行工程地质与岩土工程资料交流与利用。
研究方法 本文以雄安新区工程地质调查资料为基础，阐述了雄安新区第四纪地层特征，进行了工程地质分区，划分了100 m以浅地层工程地质层组，分析了各层组的空间分布规律及其工程特性；构建了三维工程地质结构模型，探讨了其在城市规划建设中的应用。
研究结果 雄安新区全新世地层底板埋深一般7~16 m，晚更新世地层底板埋深一般50~60 m，中更新世地层底板埋深一般70~80 m，早更新世地层底板埋深约140~190 m；可将雄安新区工程地质区划分为冲积—洪积平原工程地质亚区、冲积—湖积平原工程地质亚区和冲积平原工程地质亚区；100 m深度范围内地层可划分18个工程地质层组，其中①~④层为全新统（Q_h），⑤~⑪层为上更新统（Q_p³），⑫~⑮层为中更新统（Q_p²），⑯~⑱层为下更新统（Q_p¹），构建了研究区三维工程地质结构模型，能够直观地展示雄安新区地下100 m范围内各层组的空间分布规律与结构特征。
结论通过划分工程地质层组，建立三维工程地质结构模型，可服务于雄安新区顶层规划设计、场地稳定性和工程建设适宜性评价、天然地基和桩基持力层选择、城市地铁隧道选线施工等，为高标准高质量建设雄安新区提供了重要的地学依据。

Abstract:
This paper is the result of urban geological survey engineering.
Objective In order to standardize the division of engineering geological strataandbuild the three-dimensional engineering geological structure model of Xiong'an New Area, it is better to exchange and utilization of engineering geological and geotechnical engineering data.
Methods In this paper, based on the data of engineering geological survey, the characteristics of Quaternary strata is expounded in Xiong'an New Area, and engineering geological zoning is carried out. The engineering geological strata of soil in 100 meters depth and their substrata are divided, and the spatial distribution and engineering characteristics of each stratum are analyzed. The three-dimensional engineering geological structure of Xiong'an New Area is builded, and its applicationin urban construction is discussed.
Results The results show that the Holocene floor depth is generally 7-16 m, the Late Pleistocene floor depth is generally 50-60 m, the Middle Pleistocene floor depth is generally 70-80 m, and the Early Pleistocene floor depth is about 140-190 m in Xiong'an New Area. The Quaternary strata can be divided into the alluvial and proluvial plain engineering geological subarea, the alluvial and lacustrine plain engineering geological subarea and alluvial plain engineering geological subarea. The stratum of 100 m depth can be divided in to 18 engineering geological strata, of which ①-④ strata are Holocene (Q_h), ⑤-⑨ strata are Upper Pleistocene (Q_p³), ⑫-⑮ strata are Middle Pleistocene (Q_p²), and ⑯-⑱ strata are Lower Pleistocene (Q_p¹). The three dimensional engineering geological structure model of the study area is constructed, which can intuitively show the stratigraphic distribution and structural characteristics within the depth range of 100 meters underground in Xiong'an New Area.
Conclusions Through the division of engineering geological layer groups and the establishment of three-dimensional engineering geological structure model, it can serve the top planning and design of Xiong'an New Area, the evaluation of site stability and suitability, the selection of natural foundation and pile foundation bearing layer, subway tunnel line selection and site construction, etc., providing an important geological basis for high standard and high-quality construction of Xiong'an New Area.

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