Karst development law of Huashan Town and Huadong Town in Huadu District of Guangzhou City
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摘要: 近年来，广州市花都区花东镇、花山镇发生多起岩溶地面塌陷，而对该地区岩溶发育规律研究较为薄弱，故本次利用《广东省广州市地质灾害详细调查（1：50 000）》项目平台，以"点面结合"为手段，采用野外调查配合钻探、物探等方法研究花东镇、花山镇南部冲洪积平原岩溶发育规律、规模及成因。研究表明，本区属于岩溶强发育区，主要为埋藏型岩溶，受地形地貌、地层岩性、地质构造、地下水特征等因素控制，人类工程活动通过改变地下水平衡，促进岩溶的发育。地形地貌和标高控制研究区岩溶的纵、横向发育，纵向上主要分布在-15~-10 m标高段，向上下两侧依次递减，横向上一般分布在地势低洼地段。而在相似地质环境条件下，岩溶发育的规模及数量与Ca2+的含量呈正相关。Abstract: In recent years, many karst process ground subsidences have occurred in Huadong Town and Huashan Town of Huadu District, Guangzhou City. However the research on karst development laws in this area is relatively weak. Therefore, utilized the project platform that detailed survey of geological disasters for 1∶50 000 scale in Guangzhou, Guangdong Province, to study the karst process development laws, scale and genesis of the alluvial plains in Huadong Town and Huashan Town by field investigations combined with drilling and geophysical methods. The study shows that the area is strong karst development area, which is mainly buried karst. The karst process in this area is controlled by landform, stratum lithology, geological structure, groundwater characteristics and other factors. Human engineering activities can promote the development of karst by changing the groundwater balance. The vertical and horizontal development of karst in the study area is controlled by topography and elevation. In the longitudinal direction, it is mainly distributed in the elevation section of-15 to-10 m, and decreases gradually from the upper and lower sides, and generally distributed in low-lying areas horizontally. Under similar geological conditions, the scale and quantity of karst development are negatively correlated with the terrain, and positively correlated with the content of Ca2 +.
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Key words:
- karst development laws /
- Huashan Town-Huadong Town /
- Ca2+ content
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