| The occurrence of ground fissures have exacerbated the trend in recent years. Beijing district is located in the belt of ground fissures in north china. Ground fissures caused serious damage to property. The people in densely populated areas also have some negative impact on psychological. A direct impact on industrial and agricultural production, construction, urban planning, lifeline engineering, land use, etc. The development of its research department by the geological hazards and the broad masses of attention and concern.As the Beijing area in which the tectonic position. And its geological structure and topography. At the same time as large-scale human activities in recent years. To cause more serious in Beijing’s ground fissures. In recent years a large number of large-scale groundwater pumping and the implementation of construction projects, further exacerbating the incidence of earth fissures, increasing the size of the development of disaster. Tangshan earthquake of 1976 led directly or indirectly, in some parts of Beijing the occurrence of earth fissures. The ground fissures in Gaoliying BeiJing was first found in the camp 90’s of last century. The survey found many cracks in the wall and surface cracks. Crack width is generally a few millimeters - more than ten mm ranging up to 200mm. Frequent human activities within the Study Area. The phenomenon of partial destruction of ground fissures. The survey found the area to the performance of the ground surface cracks and surface cracks in the building cracking. In which the ground buildings (housing cracking) for the most severely damaged sections Village XiWangLu. Surface cracks at the most serious Village TangZiTou in the woodland. Buildings through cracks in the wall perpendicular to the surface normal. Part of the tilt angle (generally greater than 60°) through to the ground. Linear surface crack distribution, ranging from a few meters to ten meters, up to 90m (woodland of Village TangZiTou ). Survey shows that the overall trend for the ground fissure to the north east, Individual lots such factors as slightly different formation media.Ground fissures has been the focus of the research is to explore the ground and causes cracks in the mechanism of tectonic origin formed the view, the causes of groundwater exploitation, as well as complex structural causes of view of groundwater. In recent years, experts and scholars associated with the causes of ground fissure in GaoLiYing. Some believe that the region is due to cracks the creep of Huangzhuang– Gaoliying faultage. Some think that is due to rapid economic development, caused by excessive pumping of deep groundwater. Compromise while some held the view that is caused by two common. Although the causes of the formation of a certain point of view. Also have a basis for support-related. But none of them have a more detailed site investigation and detailed research work in the ground fissure in GaoLiying. Based on the information given, including the detailed level are not adequate to support the views of the corresponding. This article relies on the production-related projects, projects on the ground fissures were a lot of field survey work, the use of geophysical and geochemical exploration, drilling, trenching, remote sensing, field survey, dynamic monitoring of groundwater level, ground crack monitoring, land subsidence, dating test means of numerical simulation studies, exploration and advanced technology,comprehensive exploration methods. Also collected the corresponding data and previous research work. Finally, the conclusion was that ground fissure in GaoLiying causes by the "construction - ground water" mining. |
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