双桥静力触探试验在土层划分中的应用研究  

Application of Cone Penetration Test for Soil Layers Division

作　　者：王刚 江巍 陈宗清 秦双杰 聂礼齐 Wang Gang;Jiang Wei;Chen Zongqing;Qin Shuangjie;Nie Liqi(Institute of Engineering Design,Academy of Airforce,Beijing 100068,China)

机构地区：[1]空军研究院工程设计研究所,北京100068

出　　处：《岩土工程技术》2020年第6期365-371,共7页Geotechnical Engineering Technique

摘　　要：土层划分是岩土工程勘察中广泛面临的问题,对此,工程界应用钻探和标准贯入试验(SPT)较多,并积累了相当丰富的经验,利用静力触探试验(CPT)这一经济且有效的方法解决这一问题具有工程实际意义。为探究静力触探曲线在土层划分中的应用,根据徐州市以南某场地静力触探试验曲线,利用力学分层和地区经验定名土层这一综合方法划分了土层。将划分结果与钻孔分层结果对比可知,在划分土层层数方面,利用该方法划分的土层层数与利用钻孔划分的层数相同;在土层界面深度确定方面,当土层较厚时(一般大于1 m),利用该方法确定的土层界面深度与利用钻孔所确定的深度基本一致,土层界面深度最大绝对误差为0.70 m,平均绝对误差为0.24 m,最大相对误差为0.54,平均相对误差为0.16。根据对比结果可知,该综合方法能很好地揭示场地土层的分布规律。同时还总结了场地土层四种土体锥尖阻力-深度曲线和摩阻比-深度曲线特征,可为土层划分提供参考。Soil layers division is a problem widely concerned in geotechnical engineering investigation.Aiming at solving this problem,drilling and standard penetration test(SPT)have been widely applied in engineering field,and abundant experience has been gained.Meanwhile,how to use cone penetration test(CPT)to solve the problem economically and effectively is of practical significance in engineering application.The application of static cone penetration curve in shallow soil layers division is studied based on the CPT curves acquired in a site located in south of Xuzhou,and the soil layers are divided by mechanics and named the soil by local experience.Comparing the soil layers division results acquired by this method and the results achieved by drilling hole,the division number of layers are the same.The depth of soil layers gained by this method is similar to that achieved by drilling hole when the soil is thick(the thickness is generally more than 1 m).For the interface depth of soil layers,the maximum and mean values of absolute error are 0.7 m and 0.24 m,and that of relative error are 0.54 and 0.16.From the comparison results,it is concluded that this synthesis method can reliably reveal the distribution of soil layers.Moreover,the features of the cone tip resistance-depth curves and the friction-resistance ratio-depth curves of four categories of soil layers were summarized,which offer a reference for soil layers division.

关 键 词：静力触探 土层划分 锥尖阻力 摩阻比 力学分层 地区经验定名 

分 类 号：TU413.5[建筑科学—岩土工程]