Characteristics of shallow underground ancient channels in urban areas: A case study of Quaternary underground palaeochannel in Tonghu Basin, Guangdong Province
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摘要:
人类文明与城市发展往往与河流息息相关。在地质历史时期继承性形成的古河道被埋藏在城市地下。由于其自身垂向和横向上的演化特性，造成城市地下不良岩土体分布较复杂，进一步造成古河道分布区地下空间开发过程中工程地质问题突出，因此，需要摸清古河道的空间特征。以地处大湾区东翼的广东省惠州市潼湖盆地第四系为例，综合利用钻探及地球物理资料，结合地表继承性沉积，从精细地层划分与沉积相识别入手，通过"垂向分期、侧向划界、平剖互动"的流程，逐级对古河道及沉积内部构型进行深入的解剖分析，形成了一套城市地下古河道分析描述方法，，对大湾区其他区块和具有相似沉积特征的其他城市地下空间表征提供借鉴。
Abstract:Human civilization and urban development are closely related to rivers. Due to its longitudinal and horizontal evolution, the complex distribution of palaeochannel formed in the geological history period and buried underground, the distribution in urban underground is relatively complex. However, in view of the prominent engineering geological problems such as the sensitivity and vulnerability of the distribution area of palaeochannel in the process of space development, it is urgent to find out the spatial characteristics and engineering characteristics of palaeochannel course. The quaternary system of Tonghu basin in Huizhou City, located in the east wing large bay area of Guangdong Province, was taken as an example. Comprehensive use of drilling and geophysical data, combined with surface inherited deposits, this work started from fine stratigraphic division and sedimentary facies identification, through the process of "vertical staging, lateral demarcation, flat profile interaction". A set of methods for analyzing and describing ancient rivers were establish by analyzing the structure of ancient river and sedimentary interior in depth step by step, which can provide reference for the characterization of underground space in other areas of the Greater Bay Area and other cities with similar sedimentary characteristics.
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Key words:
- urban geology /
- palaeochanne /
- deposition configuration /
- the Greater Bay Area
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