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

Journal of Rock Mechanics and Geotechnical Engineering 2023年第4期15卷 984-996页

作者： Xianwei Zhang Xinyu Liu Ran An Xinming Li State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China College of Urban Construction Wuhan University of Science and TechnologyWuhan430065China School of Civil Engineering and Architecture Zhongyuan University of TechnologyZhengzhou450007China

Because of the cementation inherited from the parent rock,weathered granitic soil is usually susceptible to disturbance,which poses considerable challenges for laboratory *** cone penetration test with pore pressure measurements has long been known for its reliability in site investigations and stratigraphic ***,although extensive piezocone test results and experience are available for sedimentary soil,similar advances are yet to be made for weathered granitic ***,the experience from sedimentary soil may not be directly applicable to weathered profiles because of the essentially different natures of the two types of *** study performs seismic piezocone tests in a weathered granitic profile comprising residual granitic soil,completely weathered granite,and highly weathered *** 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 *** 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

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Geochemistry and zircon U-Pb ages of the Oligocene sediments in the Baiyun Sag, Zhujiang River Mouth Basin

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Acta Oceanologica Sinica 2021年第2期40卷 123-135页

作者： Rui Sun Ming Ma Kai Zhong Xiayang Wang Zhao Zhao Shuai Guo Xingzong Yao Gongcheng Zhang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000China Key Laboratory of Petroleum Resources Gansu ProvinceLanzhou 730000China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China CNOOC Research Institute Co. Ltd.Beijing 100028China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China Department of Geology Northwest UniversityXi’an 710069China

In this study,element geochemistry and zircon chronology are used to analyze the Oligocene sediments in the Baiyun Sag,Zhujiang River Mouth *** experimental results are discussed with respect to weathering conditions,parent rock lithologies,and *** chemical index of alteration and the chemical index of weathering values of mudstone samples from the lower Oligocene Enping Formation indicate that clastic particles in the study area underwent moderate *** samples exhibit relatively enriched light rare earth elements and depleted heavy rare earth elements,"V"-shaped negative Eu anomalies,and negligible Ce *** rare earth element distribution curves are obviously right-inclined,with shapes and contents similar to those of post-Archean Australian shale and upper continental crust,indicating that the samples originated from acid rocks in the upper *** Hf-La/Th and La/Sc-Co/Th diagrams show this same origin for the sediments in the study *** the samples from the upper Enping deltas,the overall age spectrum shows four major age peaks ca.59–68 Ma,98–136 Ma,153–168 Ma and 239–260 *** the Zhuhai Formation samples,the overall age spectrum shows three major age peaks ca.149 Ma,252 Ma and 380 *** detrital zircon shapes and U-Pb ages reveal that during Oligocene sedimentation,the sediments on the northwestern margin of the Baiyun Sag were supplied jointly from two provenances:Precambrian-Paleozoic metamorphic rocks in the extrabasinal South China fold zone and Mesozoic volcanic rocks in the intrabasinal Panyu Low Uplift,and the former supply became stronger through ***,the provenance of the Oligocene deltas experienced a transition from an early proximal intrabasinal source to a late distal extrabasinal source.

关键词： weathering degree lithology of parent rock provenance element geochemistry zircon U-Pb ages Baiyun Sag

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