大连城山头红色风化壳粒度特征分析

Analysis of the grain size characteristics of the red weathering crust of Chengshantou,Dalian

选取大连地区城山头滨海红色风化壳作为研究对象,利用粒度分析对风化壳的发育特征进行研究.结果显示:①城山头红色风化壳的粒度组成以粉砂为主,砂粒次之,黏粒所占比重则是三者最小;②粉黏比含量随深度由上至下表现为减小—增加—减小3个阶段的变化,表示城山头红色风化壳的发育程度经历了高—低—高的变化;③根据矩值法的计算公式计算了样品的粒度参数结果:粒径平均值为4.82Φ,粒径较粗;标准差平均值为2.54,分选很差;峰态平均值为0.92属中等峰态;偏度平均值为0.07,呈近对称分布.

In this paper,the coastal red weathering crust of Chengshantou in Dalian is selected as the research object,and the development characteristics of the weathering crust are studied by particle size analysis.The results show that:①The grain size of the red weathered crust of Chengshantou is mainly silt,followed by sand,and the proportion of clay particles is the smallest of the three;②The content of powder viscosity ratio increases with depth from top to bottom.The changes in the three stages of decrease—increase—decrease indicate that the development of Chengshantou's red weathering crust has undergone a high—low—high change.③According to the calculation formula of the moment method,the particle size parameters of the sample are calculated.The average particle size is 4.82Φ,the particle size is relatively coarse;the average standard deviation is 2.54,and the sorting is very poor;the average kurtosis is 0.92,which belongs to moderate kurtosis;the average value of skewness is 0.07,which is nearly symmetrical.