Based on China National Standard of Soil Engineering Classification (GB/T 50145-2007) and the Unified Soil Classification System of American Society for Testing Materials (ASTM D-2478), two kinds of soil laboratory en...Based on China National Standard of Soil Engineering Classification (GB/T 50145-2007) and the Unified Soil Classification System of American Society for Testing Materials (ASTM D-2478), two kinds of soil laboratory engineering classification methods were discussed and analyzed from the aspects of the definition in particle fraction, classification of soil type and evaluation standard for soil gradation. There is a same limit of fine grains fraction in the two standards, and there are three main types of soil in GB/T 50145-2007 and two in ASTM D-2487. Different evaluation standards of gradation are put forward for gravels and sands in ASTM D-2487. Same criteria of A line, B line and controlling value of plastic index are in the plasticity chart of both standards.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 Projects of National Natural Science Foundation of China ( Nos. 40902077,41111120084,41172236)
文摘Based on China National Standard of Soil Engineering Classification (GB/T 50145-2007) and the Unified Soil Classification System of American Society for Testing Materials (ASTM D-2478), two kinds of soil laboratory engineering classification methods were discussed and analyzed from the aspects of the definition in particle fraction, classification of soil type and evaluation standard for soil gradation. There is a same limit of fine grains fraction in the two standards, and there are three main types of soil in GB/T 50145-2007 and two in ASTM D-2487. Different evaluation standards of gradation are put forward for gravels and sands in ASTM D-2487. Same criteria of A line, B line and controlling value of plastic index are in the plasticity chart of both standards.
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.
