Site observations of weathered granitic soils subjected to cementation and partial drainage using SCPTU  

作　　者：Xianwei Zhang Xinyu Liu Ran An Xinming Li 

机构地区：[1]State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,430071,China [2]University of Chinese Academy of Sciences,Beijing,100049,China [3]College of Urban Construction,Wuhan University of Science and Technology,Wuhan,430065,China [4]School of Civil Engineering and Architecture,Zhongyuan University of Technology,Zhengzhou,450007,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2023年第4期984-996,共13页岩石力学与岩土工程学报（英文版）

基　　金：This paper was financially supported by the National Natural Science Foundation of China(Grant No.41972285);the Youth Innovation Promotion Association CAS(Grant No.2018363);Key R&D projects of Hubei Province,China(Grant No.2021BAA186).

摘　　要：Because of the cementation inherited from the parent rock,weathered granitic soil is usually susceptible to disturbance,which poses considerable challenges for laboratory characterization.The cone penetration test with pore pressure measurements has long been known for its reliability in site investigations and stratigraphic profiling.However,although extensive piezocone test results and experience are available for sedimentary soil,similar advances are yet to be made for weathered granitic soil.Moreover,the experience from sedimentary soil may not be directly applicable to weathered profiles because of the essentially different natures of the two types of geomaterials.This study performs seismic piezocone tests in a weathered granitic profile comprising residual granitic soil,completely weathered granite,and highly weathered granite.Pore pressure is measured at both the cone mid-face and the shoulder,and the effects of penetrometer size and penetration rate are considered.A series of updated soil behavior type charts is proposed to interpret the test results,thereby allowing the effect of weathering to be evaluated.This paper offers an important extension to the sparse data on the in situ responses of weathered materials.

关 键 词：Weathered granite Seismic piezocone test CEMENTATION Soil classification Pore pressure Weathering degree 

分 类 号：TU45[建筑科学—岩土工程]