Study On The Environmental Change And Geological Disasters Of The Loess Plateau Region

As social economy and human engineering activities development,China's increasingly frequent geological disasters, the increasing scale of human economy and a growing threat to public safety, strengthen the rule of geological disasters become increasingly important.In this paper, combined with China Geological Survey "Geological disasters in Yan'an in Shaanxi Province thorough investigation" project research results. Combination of a geological survey, carry out regular review to the style of yan'an geological disaster area, the key is to a landslide,According to previous research, study on the relationship between loess climate change and geological disasters of the loess plateau region. Reviewed and analysised mainly from a few aspects of the structure of elevating, slide surface of type, the loess differentiated and climate change and the relation of landslides.With the climate evolution, the loess "wind into that" for the majority of scholars to accept, In Pliocene,due to the hoisted of the qinghai-tibet plateau,the formation of the Pamir Plateau, The loess plateau region through many dry and cold and damp heat change, At different stages formed the different substance and structures of the loess, according to the predecessors research and Luochuan sections, detailed analysis of the sedimentation environment and climatic change of loess.Through investigation and analysis, Yan'an area has been in tectonic uplift, the tectonic uplift intensified downward water erosion, promote valley development, formated the loess slope, provided the terrain conditions to the landslides occurred; Accused of slide surface is divided into four types,the ancient soil hand, the Tertiary red clay surface and the weathered bedrock surface, respectively analysised on the control slip surface and the relationship between environment and climate; The discrepancy of sedimentation environment of loess,lead to the distribution of loess between North and South, Large quantity and small scale in northern, in the southern conversely; Yan'an region has experienced the climate change of dry and cold and wet heat of the alternate,this region landslides experienced several developmental stages in wet and heat environment.Finally, choose two typical landslides to comprehensive analysis from the above several aspects. Our research for disaster prevention and control of a geological planning management to Yan'an have the guiding role.