| Due to the high and steep terrain on both sides of the Yangshui River and the mining of Yangshui Phosphate Ore,a large number of collapses occur on the Yangshui River in Jinzhong Town,Kaiyang County every year.The rock after avalanche forms a high-steep avalanche accumulation with a surface close to the natural angle of repose.This collapsed accumulation has a loose structure and poor overall stability.It is easy to lose stability and damage under bad working conditions,forming secondary disasters,and seriously threatening the safety of people's lives and properties.This paper selects the collapse of Xiaomaopo in Jinzhong Town,Kaiyang County as the research object,combined with previous research results,through field surveys,drone aerial photography,image processing,numerical simulation and other means,analyzed the formation of Xiaomaopo collapsed deposits.The formation mechanism,the accumulation characteristics of collapsed deposits,and the collapse period are introduced to analyze the horizontal,vertical,and deep particle size distribution characteristics.The main research contents and results of this paper are as follows:(1)Through field investigation and data collection and sorting,the engineering geological conditions of the geological disaster area of Xiaomaopo collapse were ascertained,and the mine location and mining status were verified.(2)The reasons affecting the collapse are analyzed.The Xiaomaopo collapse is considered to be a tensile-shear collapse.(3)Combining image recognition,quantitatively described the basic characteristics of Xiaomaopo deposits,and divided the deposits into three areas:the main area,the scattered area,and the affected area.(4)Apply image processing technology to the particle size statistics of collapsed deposits and verify them.According to the fitting curve and the statistical results,it is believed that the particle size of the accumulation obeys the inverse distribution of Y=A+(B/t),and the small stones are the main component of the accumulation.The small rocks in the collapsed deposits show a trend of first decreasing in the vertical direction,then increasing and then decreasing;in the horizontal direction,the content of the particle size components in each zone with the same distance from the collapse source is basically the same.(5)Use PFC3 D to simulate the accumulation process of Xiaomaopo collapse and count the accumulation particles.The cumulative characteristics and trends expressed by the cumulative curves of each area calculated by the three statistical methods are basically the same.Along the direction of accumulation,large particles are mainly distributed in the middle and lower part of the slope,while small particles are mainly distributed in the middle and upper part of the slope;along the depth direction,large and medium particles are mainly concentrated on the shallow surface,that is,the reaction that appears in the collapsed accumulation body.Grain sequence hierarchical structure.(6)Use numerical chute accumulation test to introduce collapse period.The results show that the characteristics and trends of the cumulative curve of particle size in each direction in different periods are basically the same,and the period mainly affects the distribution of small particle sizes.The horizontal and central areas of the accumulation body are mainly affected by the period less,and vice versa;the vertical areas are less affected by the period;the deep central area is less affected by the period,and vice versa.,The top area mainly affects the distribution of small particles,and the bottom area mainly affects the distribution of large particles. |
PDF Full Text Request