The compositions, technical principles and construction equipments of a new piling method used for ground improvement plastic tube cast-in-place concrete pile were introduced. The results from static load tests on sin...The compositions, technical principles and construction equipments of a new piling method used for ground improvement plastic tube cast-in-place concrete pile were introduced. The results from static load tests on single piles with different forms of pile shoes and on their composite foundations were analyzed. The distribution patterns of axial force, shaft friction and toe resistance were studied based on the measurements taken from buried strain gauges. From the point of engineering application, the pile has merits in convenient quality control, high bearing capacity and reliable quality, showing higher reasonability, advancement and suitability than other ground improvement methods. The pile can be adopted properly to take place of ordinary ground improvement method, achieving greater economical and social benefits.展开更多
区域异质性作为“基于地”政策设计的逻辑起点,其空间分异特征直接决定了政策干预的排他性和精准度。作为区域经济理论的前沿和重要突破,“基于地”政策(Place Based Policies)的核心价值在于通过因地制宜的目标导向性政策支持,破解传...区域异质性作为“基于地”政策设计的逻辑起点,其空间分异特征直接决定了政策干预的排他性和精准度。作为区域经济理论的前沿和重要突破,“基于地”政策(Place Based Policies)的核心价值在于通过因地制宜的目标导向性政策支持,破解传统“均质化”政策工具的制度困境,激发地方内生增长潜力,实现地方繁荣。该政策具有以下四个特点:其一,目标导向的“地区繁荣”属性。其二,空间排他性的精确政策边界。其三,因地制宜的“地方感”。其四,工具组合的多元化。根据“基于地”政策的政策类别及受益对象差异,其作用路径可归纳为两条主线:其一,以提升企业生产力为导向的纯粹的“基于地”政策;其二,以促进劳动力就业与提高工资水平为导向的“基于地”的人口政策。前者通过提升企业生产力激发区域经济效率,后者则通过优化人力资本配置促进社会经济增长,二者协同作用,共同推动地区繁荣。在实践层面,此类政策涵盖基础设施建设、企业区设立、产业集群等多种政策工具,其作用机制在于改善企业外部运营环境并激活空间集聚效应,进而提升区域生产效率。在“基于地”政策评估方面,相较于传统的计量评估方法,量化空间模型代表当前前沿的研究范式。展开更多
基金Project (2007H03) supported by Communications Department of Zhejiang Province
文摘The compositions, technical principles and construction equipments of a new piling method used for ground improvement plastic tube cast-in-place concrete pile were introduced. The results from static load tests on single piles with different forms of pile shoes and on their composite foundations were analyzed. The distribution patterns of axial force, shaft friction and toe resistance were studied based on the measurements taken from buried strain gauges. From the point of engineering application, the pile has merits in convenient quality control, high bearing capacity and reliable quality, showing higher reasonability, advancement and suitability than other ground improvement methods. The pile can be adopted properly to take place of ordinary ground improvement method, achieving greater economical and social benefits.
文摘区域异质性作为“基于地”政策设计的逻辑起点,其空间分异特征直接决定了政策干预的排他性和精准度。作为区域经济理论的前沿和重要突破,“基于地”政策(Place Based Policies)的核心价值在于通过因地制宜的目标导向性政策支持,破解传统“均质化”政策工具的制度困境,激发地方内生增长潜力,实现地方繁荣。该政策具有以下四个特点:其一,目标导向的“地区繁荣”属性。其二,空间排他性的精确政策边界。其三,因地制宜的“地方感”。其四,工具组合的多元化。根据“基于地”政策的政策类别及受益对象差异,其作用路径可归纳为两条主线:其一,以提升企业生产力为导向的纯粹的“基于地”政策;其二,以促进劳动力就业与提高工资水平为导向的“基于地”的人口政策。前者通过提升企业生产力激发区域经济效率,后者则通过优化人力资本配置促进社会经济增长,二者协同作用,共同推动地区繁荣。在实践层面,此类政策涵盖基础设施建设、企业区设立、产业集群等多种政策工具,其作用机制在于改善企业外部运营环境并激活空间集聚效应,进而提升区域生产效率。在“基于地”政策评估方面,相较于传统的计量评估方法,量化空间模型代表当前前沿的研究范式。
