The India-Asia collision resulted in the formation of Qinghai-Tibet Plateau.Lower crustal flow model was proposed to explain the mechanism of Cenozoic tectonic deformation of Qinghai-Tibet Plateau.In this study,we pro...The India-Asia collision resulted in the formation of Qinghai-Tibet Plateau.Lower crustal flow model was proposed to explain the mechanism of Cenozoic tectonic deformation of Qinghai-Tibet Plateau.In this study,we propose a new approach by combining centrifugal analog modeling with numerical simulation to simulate the tectonic uplift history of the plateau based on the lower crustal flow model,and to investigate the material migration characteristics and the influence of crustal motion velocity and ductile layer viscosity on the plateau tectonic geomorphology.The models reproduce steep-sided flat-topped geomorphic features and clockwise rotation of the material at eastern Himalayan Syntaxis,verifying the rationality of the models.The results show that the greater the crustal motion velocity and the greater the ductile layer viscosity,the steeper the terrain change;and conversely,the smaller the crustal motion velocity and the smaller the ductile layer viscosity,the gentler the terrain change.This study further indicates that the weak lower crust plays an important role in the formation of geomorphic features and material migration characteristics of Qinghai-Tibet Plateau,and provides a new insight for the study of the uplift mechanism of the Tibetan Plateau.展开更多
With rapid urbanization in China,a large amount of excavated soil and construction sludge is being generated from geotechnical and underground engineering.For sustainable management of these construction wastes,it is ...With rapid urbanization in China,a large amount of excavated soil and construction sludge is being generated from geotechnical and underground engineering.For sustainable management of these construction wastes,it is essential to quantify their production first.The present study has attempted to classify the excavated soil and construction sludge according to their composition and geotechnical properties(particle size,water content,plasticity index).Based on these classifications,a new approach was proposed to quantify the production.The said approach was based on multi-source information,such as the urban topographic map,geological survey reports,urban master plan,and remote sensing images.A case study in Wenzhou city of China was also pursued to illustrate the validity of the newly developed approach.The research showed that in 2021–2025,the total excavated soils and construction sludge production in Wenzhou would reach 107.5×10^(6) and 81.7×10^(6) m^(3),respectively.Furthermore,the excavated soil was classified into the miscellaneous fill,crust clay,muddy clay and mud with silty sand.Likewise,the construction sludge was classified as liquid sludge and paste-like sludge.The classification and quantification can serve as guidance for disposal and recycling,thereby leading to high-level management of waste disposal.展开更多
基金supported by Excellent Research Group Project for Multiphase Evolution in Hyper-Gravity of the National Natural Science Foundation of China(No.52588202)。
文摘The India-Asia collision resulted in the formation of Qinghai-Tibet Plateau.Lower crustal flow model was proposed to explain the mechanism of Cenozoic tectonic deformation of Qinghai-Tibet Plateau.In this study,we propose a new approach by combining centrifugal analog modeling with numerical simulation to simulate the tectonic uplift history of the plateau based on the lower crustal flow model,and to investigate the material migration characteristics and the influence of crustal motion velocity and ductile layer viscosity on the plateau tectonic geomorphology.The models reproduce steep-sided flat-topped geomorphic features and clockwise rotation of the material at eastern Himalayan Syntaxis,verifying the rationality of the models.The results show that the greater the crustal motion velocity and the greater the ductile layer viscosity,the steeper the terrain change;and conversely,the smaller the crustal motion velocity and the smaller the ductile layer viscosity,the gentler the terrain change.This study further indicates that the weak lower crust plays an important role in the formation of geomorphic features and material migration characteristics of Qinghai-Tibet Plateau,and provides a new insight for the study of the uplift mechanism of the Tibetan Plateau.
基金This work was supported by Zhejiang Province Key Research and Development Program(No.2019C03107)China National Key Research and Development Program(No.2018YFC1802300).
文摘With rapid urbanization in China,a large amount of excavated soil and construction sludge is being generated from geotechnical and underground engineering.For sustainable management of these construction wastes,it is essential to quantify their production first.The present study has attempted to classify the excavated soil and construction sludge according to their composition and geotechnical properties(particle size,water content,plasticity index).Based on these classifications,a new approach was proposed to quantify the production.The said approach was based on multi-source information,such as the urban topographic map,geological survey reports,urban master plan,and remote sensing images.A case study in Wenzhou city of China was also pursued to illustrate the validity of the newly developed approach.The research showed that in 2021–2025,the total excavated soils and construction sludge production in Wenzhou would reach 107.5×10^(6) and 81.7×10^(6) m^(3),respectively.Furthermore,the excavated soil was classified into the miscellaneous fill,crust clay,muddy clay and mud with silty sand.Likewise,the construction sludge was classified as liquid sludge and paste-like sludge.The classification and quantification can serve as guidance for disposal and recycling,thereby leading to high-level management of waste disposal.
