The Study On The Genetic Mechanism Of The Baizhuang Ground Fissure

Ground fissure is a macroscopic deformation geological phenomenon which with the rupture in the ground as the main feature,but also a kind of direct damage supergene geological disasters to the soil surface,Its broad development and great harm are rare in the world.As human engineering practice expanding to the field of natural hazards,the harm of ground fissures become increasingly prominent.Since the late 1990 s,there had already occurred ground fissure in Baizhuang,Jiaozuo.The ground fissure passed through the middle route ofsouth-to-northwater transfer project.The acute activity of the ground fissure would do serious harm to safe running of the project.There are some causing disaster factors such as active fault,coal mined out area,mine drainage and groundwater overexploitation in Baizhuang area.The Baizhuang ground fissure is the research object in this paper,through the comprehensive investigation to the current distribution status of Bai Zhuang ground fissures,the development characteristics will be found out by approaches of surveying and mapping,exploratory trench,drilling,geophysical exploration and dating.Based on data and field investigation in Baizhuang area,the main influence factors will be revealed by study the relationship of the ground fissure with topography and geomorphology,formation lithology,active fault,modern tectonic stress field,hydrogeology condition,coal mined out area,mine drainage and groundwater overexploitation.The genetic mechanism of multi-factor ground fissure will be proposed by numerical simulation analysis.The major works and results of this dissertation are as follows:(1)Based on the large field survey,use of trenching,geophysical,geophysical exploration and other technical means,found the plane development characteristics and profile characteristics of Baizhuang ground fissure.(2)Through data collectionand field investigation in Baizhuang area,the main influence factors are revealed by study the relationship of the ground fissure with topography and geomorphology,formation lithology,active fault,modern tectonic stress field,hydrogeology condition,coal mined out area,mine drainage and groundwater overexploitation.The spread direction of Baizhuang ground fissure is controlled by Jiulishan fracture.The current activities are mainly caused by the mine drainage.(3)Based on establish models of different factors with the simulation software of Flac3 D,Generalized the formation mechanism of Baizhuang ground fissure.(4)Based on the above research results,predicted the main factors which affecting the development of ground fissure in the future are exploiting groundwater.