某震后高边坡含砾粉质粘土强度的正交试验研究

摘要

以四川省平通镇牛斐村大咀山震后高边坡上含砾粉质粘土为研究对象,通过正交试验,研究含水量、干密度和粗粒含量3个因素对震后土体抗剪强度的影响.试验得出3个因素对震后含砾粉质粘土抗剪强度指标影响的主次顺序和各因素的显著性水平.且在此基础上提出了震后含砾粉质粘土抗剪强度指标的计算公式.这些将为震后土体强度参数研究积累基础资料,并为强降雨等不利条件下高边坡安全性评价提供参考.%Based on orthogonal experiment of gravel silty clay from the high slope of Daju Mountain in Niufei Village,Pingtong Town, Sichuan Province after the 5·12 Wenchuan Earthquake, the influences of three factors, i. e. water content, dry density and coarse grains content,on shear strength were studied. By the experiment,important order and significance level of the three factors on shear strength indexes of gravel silty clay were obtained. Simultaneously the powerful functions were used to fit the relationships between shear strength indexes and the three influencing factors. The paper accumulates basic data for shear strength study of the pott-earthquake soil and provides important references for safety evaluation of the post-earthquake high slopes under the harmful conditions,for example heavy rain and so on.