淮河入海水道淤土段堤防工程施工速率控制分析

介绍淮河入海水道淤土段堤防工程的施工概况:采用逐步加高法控制软土地基堤防施工加荷速率,即利用堤防本身的质量作为压载,分级逐渐施加荷载,使软土地基强度逐渐适应上部荷载的增加,最后加至设计高度。根据太沙基一维固结理论,采用有效固结压力法推算软土地基因固结而增长的强度,通过计算分析确定采用逐步加高法施工的分级荷载和加荷时间,并利用堤防施工期的实测数据分析了计算成果的合理性。     

Simulation of environmental change in response to operation of dams in Huaihe Basin

This paper describes the model simulation of a portion of the Huaihe Basin upstream of the river mouth at Hongze Lake,with an area of 130 520 km2.The MIKE 11 modeling system was used to assess the flows and water quality in the Huaihe,Shayinghe,Honghe,Guohe,and Pihe rivers.The hydraulic part of the model was used to study the propagation of flows in the Huaihe River,which was calibrated with data from 2002-2003 and verified with data from 2004-2005.In general,there was agreement between measured and simulated discharges at all the hydrological stations.Except for some places close to large gates,there was reasonable agreement between measured and simulated water levels in the simulated rivers.The MIKE 11 WQ (water quality)model was used to study general sanitary parameters describing the river water quality in areas influenced by human activities.The water quality model simulated dissolved oxygen (DO),chemical oxygen demand (COD) and ammonia nitrogen (NH3-N).The difference between the simulated and observed concentrations was within the range that could be expected from water quality modeling,taking into account uncertainties such as pollution loads,and monitoring and sampling frequency.This model setup was also suitable for the subsequent scenario modeling of periods of water project operation.In the simulation of the Pihe River,increasing the discharge at Hengpaitou Dam was shown to cause a significant improvement in water quality downstream of Lu'an City.In the Shayinghe and Huaihe rivers,the effect was less visible.This suggests that the poor water quality in the Huaihe Basin is mainly caused by extensive discharge of domestic and industrial wastewater.     

淮河蚌埠段水环境容量的研究

文章根据水文、水质实测资料及淮河蚌埠景观娱乐用水区水质管理目标要求,按一维水质模型,计算出淮河蚌埠段景观娱乐用水区的水环境容量及污染物削减量.     

淮河流域堤防工程地质条件评价标准探讨

文章根据淮河流域的堤防的特点,提出了淮河流域堤防工程地质勘察时进行工程地质条件评价的标准.     

软起动器控制的矿山皮带机输送系统研究

矿山皮带机是矿山企业输送物料必备设备,软起动器控制皮带机可以限制起动电流,减少设备故障率。借鉴直流双闭环调速系统控制策略,构建带转速环的软起动器。给出了双闭环软起动器系统仿真模型和仿真结果。在软起动器双闭环控制策略基础之上,给出了系统的硬件结构和软件实现方法。     

“一带一路”建设对南通外贸发展的影响及对策研究

文章论述了南通当前对外贸易特征和趋势, 分析了“一带一路”建设对南通外贸发展的影响, 并从加强优势互补和政策沟通、推动外贸发展方式方面提出了相应的应对策略, 以期为南通开展外贸发展提供借鉴。     

Stress analysis model of strip winding system with a sleeve for a coil of thin stainless steel

In a strip winding process, the sleeve is a hollow cylinder that is mounted between a strip coil and a man-drel to maintain uniform coil shape when the strip coil is very thin, but its deformation behavior has not been investigated before.Thus, a finite element (FE) model was presented to calculate the stress distribu-tion in a sleeve and strip coil when 1-3 mm-thick stainless steel was wound around the sleeve.The FE model was developed by extending a previous model by adding a sleeve between the mandrel and strip, and by modifying the boundary and interaction conditions.The strip winding process was divided into an initial process and a steady-state process.During the initial process, the minimum and maximum pressure re-quired on the belt wrapper to maintain coil shape by self-friction of the strip was calculated by the FE model when the belt wrapper is ejected at the end of the initial process.After the initial process, an ana-lytical model of the steady-state process was established to calculate the stress distribution and was com-pared with the FE model to validate it.The suggested analytical model took 1 1 s to give the same stress distribution that the FE model took 30 d to produce.     

剖析几种多矿体地下矿寓有新意的联合开拓系统

本文以小寺沟铜矿、玉石洼铁矿、镜铁山铁面矿桦树沟矿区为实例,剖析了几种多矿体地下矿寓有新意的联合开拓系统,阐明其特点并提供了一系列技术参数和建设经验供参考。     

淮河流域的可持续发展及行蓄洪区的移民安置

着眼于 2 1世纪大水利建设的基本方向 ,分析制约淮河流域可持续发展的洪涝灾害和水质污染等因素的主要特征 .提出加强流域国土综合整治、实施洪涝灾害风险管理、减少行蓄洪区人口、调整生产生活方式、加强流域对雨洪的调蓄能力等 5项重要对策 .针对淮河流域的焦点问题———行蓄洪区安全建设 ,介绍东风湖行洪区实施移民建镇的基本经验 .调查结果显示 ,移民对这一举措有较高的满意度     

淮河流域的水资源保护与水污染防治

淮河是我国第一条进行水污染综合治理的大河 ,被纳入“九五”期间国家水污染防治的重点。经过多年治理 ,淮河流域水污染恶化的势头已得到初步控制 ,入河排污总量有所下降 ,水质也在向好的方向发展 ,部分河段水体功能得到一定恢复 ,但其治理效果与国务院确定的目标仍有很大差距 ,淮河治污依然任重道远。最后对下一步工作提出了建议