A typical single-layer raw soil structure in villages and towns in China is taken as the research object.In the probabilistic seismic demand analysis,the seismic demand model is obtained by the incremental dynamic tim...A typical single-layer raw soil structure in villages and towns in China is taken as the research object.In the probabilistic seismic demand analysis,the seismic demand model is obtained by the incremental dynamic time history analysis method.The seismic vulnerability analysis is carried out for the raw soil structure of nonfoundation,strip foundation,and spiral anchor composite foundation,respectively.The spiral anchor composite foundation can reduce the seismic response and failure state of raw soil structure,and the performance level of the structure is significantly improved.Structural requirements sample data with the same ground motion intensity are analyzed by linear regression statistics.Compared with the probabilistic seismic demand model under various working conditions,the seismic demand increases gradually with the increase of intensity.The seismic vulnerability curve is summarized for comparative analysis.With the gradual deepening of the limit state,the reduction effect of spiral anchor composite foundation on the exceedance probability becomes more and more obvious,which can reduce the probability of structural failure to a certain extent.展开更多
In response to the challenges posed by the transformation of China's reed industry,leading to difficulties in reed utilization,and the significant increment in raw soil from the expansion of urban infrastructure,t...In response to the challenges posed by the transformation of China's reed industry,leading to difficulties in reed utilization,and the significant increment in raw soil from the expansion of urban infrastructure,the authors proposed a novel method of coupling reed with raw soil to produce an ecological building insulation material.The aim is to enhance the thermal comfort of rural buildings and achieve building energy saving.The research has applied theoretical and experimental methods as the core means of exploration for key factors in the preparation of the novel ecological insulation material.These factors include raw soil content and curing methods.Key performance indicators such as thermal insulation,mechanical properties,fire resistance,water resistance,moisture resistance,and acoustic performance have been utilized for evaluation.The research results indicate that the proposed process and method for the preparation of the ecological insulation material effectively utilize reed and raw soil,achieving excellent multi-target performance.When the content of raw soil is in the range of 0-40%,the material's thermal conductivity ranges from 0.097 W/(m·K)to 0.104 W/(m·K),compressive strength from0.70 MPa to 0.79 MPa,water absorption rate from 29.42%to 38.95%,moisture absorption rate from 13.33%to31.48%,and the maximum sound absorption coefficient is 0.80,with a maximum sound insulation of 56.66 dB.Additionally,a non-combustible A-grade fire resistance was achieved.To expand the application space and scope of the novel material,the research team further explored on-site construction material preparation processes and conducted experimental research,focusing on the key aspect of the"curing process".The low temperature curing method of industrial heating blanket was proposed.The research results indicated that the method is feasible.At an environmental temperature of 25℃,with different curing times and curing temperatures,the material's thermal conductivity ranges from 0.089 W/(m·K)to 0.109 W/(m·K),and the compressive strength is between 0.14 MPa and 0.70 MPa,meeting the relevant parameter requirements.This research opens up avenues for other types of biomass with high economic added value applications and can be directly applied to improving the thermal environment of residential buildings,contributing to building energy saving,rural revitalization,and the implementation of dual-carbon strategies in China.展开更多
The chemical characteristics,element contents,mineral compositions,and the ameliorative effects on acid soils of five biomass ashes from different materials were analyzed. The chemical properties of the ashes varied d...The chemical characteristics,element contents,mineral compositions,and the ameliorative effects on acid soils of five biomass ashes from different materials were analyzed. The chemical properties of the ashes varied depending on the source biomass material. An increase in the concrete shuttering contents in the biomass materials led to higher alkalinity,and higher Ca and Mg levels in biomass ashes,which made them particularly good at ameliorating effects on soil acidity. However,heavy metal contents,such as Cr,Cu,and Zn in the ashes,were relatively high. The incorporation of all ashes increased soil p H,exchangeable base cations,and available phosphorus,but decreased soil exchangeable acidity. The application of the ashes from biomass materials with a high concrete shuttering content increased the soil available heavy metal contents. Therefore,the biomass ashes from wood and crop residues with low concrete contents were the better acid soil amendments.展开更多
基金the financial supports from the National Key R&D Program of China(2018YFD1100404)the Program of Liaoning Provincial Department of Education(LJKZ0564)The supports from the Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology(2022B08)。
文摘A typical single-layer raw soil structure in villages and towns in China is taken as the research object.In the probabilistic seismic demand analysis,the seismic demand model is obtained by the incremental dynamic time history analysis method.The seismic vulnerability analysis is carried out for the raw soil structure of nonfoundation,strip foundation,and spiral anchor composite foundation,respectively.The spiral anchor composite foundation can reduce the seismic response and failure state of raw soil structure,and the performance level of the structure is significantly improved.Structural requirements sample data with the same ground motion intensity are analyzed by linear regression statistics.Compared with the probabilistic seismic demand model under various working conditions,the seismic demand increases gradually with the increase of intensity.The seismic vulnerability curve is summarized for comparative analysis.With the gradual deepening of the limit state,the reduction effect of spiral anchor composite foundation on the exceedance probability becomes more and more obvious,which can reduce the probability of structural failure to a certain extent.
基金supported by the National Natural Science Foundation of China(No.52076070,No.52008166)the Natural Science Foundation of Hunan Province(No.2021JJ30256,No.2022JJ30139)the Department of Ecology and Environment of Hunan Province(No.2021003630)。
文摘In response to the challenges posed by the transformation of China's reed industry,leading to difficulties in reed utilization,and the significant increment in raw soil from the expansion of urban infrastructure,the authors proposed a novel method of coupling reed with raw soil to produce an ecological building insulation material.The aim is to enhance the thermal comfort of rural buildings and achieve building energy saving.The research has applied theoretical and experimental methods as the core means of exploration for key factors in the preparation of the novel ecological insulation material.These factors include raw soil content and curing methods.Key performance indicators such as thermal insulation,mechanical properties,fire resistance,water resistance,moisture resistance,and acoustic performance have been utilized for evaluation.The research results indicate that the proposed process and method for the preparation of the ecological insulation material effectively utilize reed and raw soil,achieving excellent multi-target performance.When the content of raw soil is in the range of 0-40%,the material's thermal conductivity ranges from 0.097 W/(m·K)to 0.104 W/(m·K),compressive strength from0.70 MPa to 0.79 MPa,water absorption rate from 29.42%to 38.95%,moisture absorption rate from 13.33%to31.48%,and the maximum sound absorption coefficient is 0.80,with a maximum sound insulation of 56.66 dB.Additionally,a non-combustible A-grade fire resistance was achieved.To expand the application space and scope of the novel material,the research team further explored on-site construction material preparation processes and conducted experimental research,focusing on the key aspect of the"curing process".The low temperature curing method of industrial heating blanket was proposed.The research results indicated that the method is feasible.At an environmental temperature of 25℃,with different curing times and curing temperatures,the material's thermal conductivity ranges from 0.089 W/(m·K)to 0.109 W/(m·K),and the compressive strength is between 0.14 MPa and 0.70 MPa,meeting the relevant parameter requirements.This research opens up avenues for other types of biomass with high economic added value applications and can be directly applied to improving the thermal environment of residential buildings,contributing to building energy saving,rural revitalization,and the implementation of dual-carbon strategies in China.
基金supported by the National Key Basic Research Program of China(No.2014CB441003)the National Key Research and Development of China(No.2016YFD0200302)
文摘The chemical characteristics,element contents,mineral compositions,and the ameliorative effects on acid soils of five biomass ashes from different materials were analyzed. The chemical properties of the ashes varied depending on the source biomass material. An increase in the concrete shuttering contents in the biomass materials led to higher alkalinity,and higher Ca and Mg levels in biomass ashes,which made them particularly good at ameliorating effects on soil acidity. However,heavy metal contents,such as Cr,Cu,and Zn in the ashes,were relatively high. The incorporation of all ashes increased soil p H,exchangeable base cations,and available phosphorus,but decreased soil exchangeable acidity. The application of the ashes from biomass materials with a high concrete shuttering content increased the soil available heavy metal contents. Therefore,the biomass ashes from wood and crop residues with low concrete contents were the better acid soil amendments.
