BASIC CHARACTERISTICS ABOUT GROUND FRACTURESrsquo|DEVELOPMENT OF WEIHE BASIN

There are many ground fractures in Weihe basin as a result of its special geological environment.Based on the detailed investigation,distributive summary of ground fractures is discussed.The basic feature is analyzed in detail.The reason why the ground fractures are formed is discussed initially.The most of the total 196 ground fractures in Weihe basin are around the faultages,which are accordant and correlative with the faultages of Weihe basin.The basic feature is mainly morphological character and distribution.The ground fractures express themselves at land surface as straight line,S and polygonal line.Section plane can be characterized that the upside is wide and the under-part is narrow,inclination angles are relatively steep.The distribution of ground fractures can be characterized as directional,ringent and netlike.The ground fractures of Weihe basin are mainly tectonic fissures and controlled by the faultages of Weihe basin.Groundwater,surface water,goaf and settlement of loess are induction factors.