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佛山市瓷海国际陶瓷城地面沉降成因分析

2021-07-23欧智德邹杰

城市地质 2021年2期
关键词:工程施工研究

欧智德 邹杰

要:佛山市瓷海国际陶瓷城自2008年起出现地面沉降现象,随着周边人类工程活动增多,地面沉降现象日趋严重。结合研究区地质背景,并运用InSAR地表形变监测技术,从自然因素和人类工程活动两方面研究了该地区地面沉降的形成原因。结果表明,引起地面沉降的内部物质条件为填土和软土的压密固结,尤其是软土分布广、厚度大、埋藏浅,为地面沉降的发育提供了重要贡献;而InSAR时序分析结果揭示了研究区地面沉降速率均在周边地下工程施工期间出现明显加快现象,故诱发和加剧地面沉降的主要外部因素为周边工程抽排地下水。

关键词:地面沉降;成因分析;软土;抽排地下水;InSAR

Cause analysis on land subsidence in Cihai International Ceramic City,

Foshan City

OU  Zhide, ZOU  Jie

(Foshan Geological Bureau of Guangdong Province (Foshan Geological Disaster Emergency Rescue Technology Center of Guangdong Province), Foshan 528000, China)

Abstract: Land subsidence appeared in Cihai International Ceramic City of Foshan in 2008. With the increase of human engineering activities, land subsidence has become increasingly serious since then. According to the geological nature of the study area and applying the InSAR surface deformation monitoring technology, this paper studies the causes of land subsidence in this area from two aspects: natural factors and human engineering activities. The results show that the internal material conditions that caused the land subsidence are compacted consolidation of filled soil and soft soil, especially the soft soil with wide distribution, large thickness and shallow burial, which provides an important contribution to the development of land subsidence. InSAR time series analysis results reveal that the land subsidence rate in the study area significantly accelerated during the construction of surrounding underground projects. Therefore, the main external factor that exacerbated land subsidence was the drainage of groundwater resulted from surrounding projects.

Keywords: land subsidence; cause analysis; soft soil; drainage of groundwater; InSAR

地面沉降是因自然因素和人類工程活动引发松散地层压缩所导致的地面高程降低的地质现象。随着城市化进程的加快和人类工程活动的加剧,它已成为一个全球性的地质环境问题和城市发展过程中的“慢性病”,是一种不可补偿的永久性环境和资源损失(郑铣鑫等,2002)。

近年来,佛山市禅城区社会经济快速发展,城镇化高速推进,由于自然和人类工程活动的影响,已逐步出现了不同规模的地面沉降现象。其中,位于禅城区南庄镇的瓷海国际陶瓷城自2008年起缓慢出现了地面沉降现象,随着周边人类工程活动日趋增多,地面沉降的影响范围逐渐扩大、沉降程度逐渐加剧,已导致区域内出现墙体开裂、道路呈波状起伏以及市政地下管线损坏等一系列问题。……

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