Study on strength properties and soil behaviour type classification of Huanghe River Delta silts based on variable rate piezocone penetration test  

作　　者：Yunuo Liu Guoqing Lin Yan Zhang Shenggui Deng Lei Guo Tao Liu 

机构地区：[1]Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering,Ocean University of China,Qingdao 266100,China [2]College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China [3]Key Lab of Submarine Geosciences and Prospecting Techniques MOE China,Ocean University of China,Qingdao 266100,China [4]College of Marine Geosciences,Ocean University of China,Qingdao 266100,China [5]Institute of Marine Science and Technology,Shandong University,Qingdao 266237,China [6]Qingdao National Laboratory for Marine Science and Technology,Qingdao 266100,China

出　　处：《Acta Oceanologica Sinica》2023年第11期146-158,共13页海洋学报（英文版）

基　　金：The National Natural Science Foundation of China under contract No.U2006213。

摘　　要：Fine-grained silt is widely distributed in the Huanghe River Delta(HRD)in China,and the sedimentary structure is complex,meaning that the clay content in the silt is variable.The piezocone penetration test(CPTu)is the most widely approved in situ test method.It can be used to invert soil properties and interpret soil behavior.To analyse the strength properties of surface sediments in the HRD,this paper evaluated the friction angle and its inversion formula through the CPTu penetration test and monotonic simple shear test and other soil unit experiments.The evaluation showed that the empirical formula proposed by Kulhawy and Mayne had better prediction and inversion effect.The HRD silts with clay contents of 9.2%,21.4%and 30.3%were selected as samples for the CPTu variable rate penetration test.The results show as follows.(1)The effects of the clay content on the tip resistance and the pore pressure of silt under different penetration rates were summarized.The tip resistance Q_t is strongly dependent on the clay content of the silt,the B_(q)value of the silt tends to 0 and is not significantly affected by the change of the CPTu penetration rate.(2)Five soil behavior type classification charts and three soil behavior type indexes based on CPTu data were evaluated.The results show that the soil behavior type classification chart based on soil behavior type index ISBT,the Robertson 2010 behavior type classification chart are more suitable for the silty soil in the HRD.

关 键 词：Huanghe River Delta piezocone penetration test silty soils clay content friction angle soil behaviour type classification 

分 类 号：P343.5[天文地球—水文科学] TU447[天文地球—地球物理学]