原位孔内剪切试验在某弃土场稳定性分析中的应用研究  

Application of in-situ borehole shear test in the stability analysis of a spoil ground

作　　者：张添锋 ZHANG Tianfeng(Fujian Geological Engineering Survey Institute,Fuzhou 350002)

机构地区：[1]福建省地质工程勘察院,福建福州350002

出　　处：《福建建筑》2023年第9期89-92,共4页Fujian Architecture & Construction

摘　　要：弃土场的填土强度参数的准确获取,对边坡的合理设计具有重要影响。因此,利用目前较为先进的原位孔内剪切仪,对弃土场的素填土开展9组有效试验分析。试验结果显示,该弃土场的素填土抗剪强度指标平均值为c=8.20kPa,φ=28.22°,标准值为c=7.28kPa,φ=27.24°,变异系数分别为0.180和0.055,试验结果的离散性相对较小,粘聚力较小的特征也与现场砂性土含量较高的实际情况相符。根据原位孔内剪切试验获取的强度参数所进行的稳定性分析,结果均为基本稳定,与弃土场边坡现状较为吻合。试验结果可为后续的边坡支护设计提供较为合理的参考。The accurate acquisition of the strength parameters of the filled soil of the dump site has an important influence on the rational design of the slope.Therefore,9 groups of effective test analysis were carried out on the plain filled soil in the spoil ground by using the current relatively advanced in-situ borehole shear test instrument.The test results show that the average shear strength index of the plain filled soil in the spoil ground is c=8.20kPa,φ=28.22°,and the standard value is c=7.28kPa,φ=27.24°.The coefficient of variation is 0.180 and 0.055,respectively.The dispersion of the test results is relatively small,and the characteristics of the low cohesion are consistent with the actual situation of the high content of sandy soil in the field.The stability analysis results based on the strength parameters obtained from the in-situ borehole shear test are basically stable,which is also consistent with the current situation of the slope in the spoil ground.The test results can provide a more reasonable reference for the subsequent slope support design.

关 键 词：弃土场 素填土 原位孔内剪切试验 边坡稳定 设计参数 

分 类 号：TU4[建筑科学—土工工程]