CHARACTERS OF THE GROUND FISSURES DEVELOPING IN BEIJING

In the past 30 years, the population in Beijing has got a sharp increase leading to the rapid expansion of the city, the extraction of groundwater resources increases year by year, aggravates the land subsidence, forms subsidence center, the activity of the ground fissures has significantly accelerated which becomes the important geological problem for the city development planning. At present, the knowledge of Beijing ground fissures are still limited to the investigation and evaluation of the individual space and a single crack evaluation, we still lack the understanding of the regional law. By collecting and summarizing related literature and survey data, conjointly fracture site surveying, we find that ground fissures in Beijing have obvious regional characteristics, the development of most ground fissures are closely associated with deep fault belt. Therefore, according to the relationship between the fault zone and ground fissures, the author divides the ground fissure zones into six regions, summarizes the distributions、occurrences、extension and the phenomena of destruction about the ground fissures, analyzes briefly about the reason of the ground fissures. Finally, several suggestions for future researches of ground fissures are put forward.