[Objective] The paper aims to explore the influences of source sink change of wheat at different densities on wheat yield.[Method] 225 （D1） and 320 plant/m2（D2） were adopted,then cutting flag leaf （L1）,the secon...[Objective] The paper aims to explore the influences of source sink change of wheat at different densities on wheat yield.[Method] 225 （D1） and 320 plant/m2（D2） were adopted,then cutting flag leaf （L1）,the second last leaf （L2）,removing upper part of spike （L3） and controlling （CK） were used to conduct field experiment.[Result] The results showed that both of the two densities of wheat＇s 1 000-grain weight and grain filling rate after anthesis in a decreasing order of L3〉CK〉L2〉L1,and the grain weight per spike and dry matter amount translated after anthesis turned to be CK〉L2〉L1 〉L3.[Conclusion].Both of leaf-cutting and spikelet removing decreased the grain weight per spike and dry matter amount translated after anthesis.Removing upper part of spike increased wheat＇s 1 000-grain weight.But the decreasing of the sink and dry matter amount translated contributed to the decreasing of the yield of wheat.展开更多
To address the fact that the mechanism of split grouting in deep weak rock formations lags far behind engineering practice,this study develops a theoretical model for splitting diffusion in a single fracture by integr...To address the fact that the mechanism of split grouting in deep weak rock formations lags far behind engineering practice,this study develops a theoretical model for splitting diffusion in a single fracture by integrating the fracture propagation morphology and slurry flow behavior.Using coupled theoretical equations within the numerical simulation software,a numerical model of grouting-induced splitting in weak rock formations was developed considering the rheological properties of the slurry viscosity.Based on the numerical simulations investigating the effects of the formation depth,slurry viscosity,and grouting rate on the effectiveness of split grouting diffusion,during split grouting operations in deep rock formations,a relatively high initial grouting rate and pressure is recommended to be adopted in the early stage to initiate or connect fractures.Following grouting pressure stabilization,the slurry viscosity should be appropriately increased to promote rapid gelation along the fracture surfaces,thereby effectively sealing the fractures.A grouting control strategy featuring initial high-pressure,high-flow injection followed by low-rate consolidation was systematically developed and successfully applied to the reinforcement of fractured surrounding rock in the-1000 m floor slab of the vehicle yard roadway in the eastern section of Guqiao Mine,achieving notable engineering results.展开更多
基金Supported by Jiangsu High School Natural Science Fund(09KJB210004)Undergraduate Practice Innovation Project of Nanjing University of Information Science & Technology (09CX0025 )Educational Reform Project of Nanjing University of Information Science &Technology (09JY0036)~~
文摘[Objective] The paper aims to explore the influences of source sink change of wheat at different densities on wheat yield.[Method] 225 （D1） and 320 plant/m2（D2） were adopted,then cutting flag leaf （L1）,the second last leaf （L2）,removing upper part of spike （L3） and controlling （CK） were used to conduct field experiment.[Result] The results showed that both of the two densities of wheat＇s 1 000-grain weight and grain filling rate after anthesis in a decreasing order of L3〉CK〉L2〉L1,and the grain weight per spike and dry matter amount translated after anthesis turned to be CK〉L2〉L1 〉L3.[Conclusion].Both of leaf-cutting and spikelet removing decreased the grain weight per spike and dry matter amount translated after anthesis.Removing upper part of spike increased wheat＇s 1 000-grain weight.But the decreasing of the sink and dry matter amount translated contributed to the decreasing of the yield of wheat.
基金supported by the National Key Laboratory Open Fund for Coal Mine Disaster Prevention and Control(No.SKLCMDPC202501)the National Natural Science Foundation of China(No.42307244)+1 种基金the Anhui Provincial Department of Education Natural Science Fund Key Project(No.2023AH052181)the Talent Research Fund Project of Hefei University(No.23RC19)。
文摘To address the fact that the mechanism of split grouting in deep weak rock formations lags far behind engineering practice,this study develops a theoretical model for splitting diffusion in a single fracture by integrating the fracture propagation morphology and slurry flow behavior.Using coupled theoretical equations within the numerical simulation software,a numerical model of grouting-induced splitting in weak rock formations was developed considering the rheological properties of the slurry viscosity.Based on the numerical simulations investigating the effects of the formation depth,slurry viscosity,and grouting rate on the effectiveness of split grouting diffusion,during split grouting operations in deep rock formations,a relatively high initial grouting rate and pressure is recommended to be adopted in the early stage to initiate or connect fractures.Following grouting pressure stabilization,the slurry viscosity should be appropriately increased to promote rapid gelation along the fracture surfaces,thereby effectively sealing the fractures.A grouting control strategy featuring initial high-pressure,high-flow injection followed by low-rate consolidation was systematically developed and successfully applied to the reinforcement of fractured surrounding rock in the-1000 m floor slab of the vehicle yard roadway in the eastern section of Guqiao Mine,achieving notable engineering results.
