Soft rock surrounding deep roadway has poor stability and long-term rheological effect. More and larger deformation problems of surrounding rock occur due to adverse supporting measures for such roadways, which not on...Soft rock surrounding deep roadway has poor stability and long-term rheological effect. More and larger deformation problems of surrounding rock occur due to adverse supporting measures for such roadways, which not only affects the engineering safety critically but also improves the maintenance costs. This paper takes the main rail roadway with severely deformation in China＇s Zaoquan coal mine as an example to study the long-term deformation tendency and damage zone by means of in-situ deformation monitoring and acoustic wave testing technique. A three-dimensional finite element model reflecting the engineering geological condition and initial design scheme is established by ABAQUS. Then, on the basis of field monitoring deformation data, the surrounding rock geotechnical and theological parameters of the roadway are obtained by back analysis. A combined supporting technology with U-shaped steel support and anchor-grouting is proposed for the surrounding soft rock. The numerical simulation of the combined supporting technology and in-situ deformation monitoring results show that the soft rock surrounding the roadway has been held effectively.展开更多
In deep underground mining, the surrounding rocks are very soft with high stress. Their deformation and destruction are serious, and frequent failures occur on the bolt support. The failure mechanism of bolt support i...In deep underground mining, the surrounding rocks are very soft with high stress. Their deformation and destruction are serious, and frequent failures occur on the bolt support. The failure mechanism of bolt support is proposed to solve these problems. A calculation theory is established on the bond strength of the interface between the anchoring agent and surrounding rocks. An analysis is made on the influence law of different mechanical parameters of surrounding rocks on the interfacial bond strength. Based on the research, a new high-strength bolt-grouting technology is developed and applied on site. Besides, some helpful engineering suggestions and measures are proposed. The research shows that the serious deformation and failure, and the lower bond strength are the major factors causing frequent failures of bolt support. So, the bolt could not give full play to its supporting potential. It is also shown that as the integrity, strength, interface dilatancy and stress of surrounding rocks are improved, the bond strength will increase. So, the anchoring force on surrounding rocks can be effectively improved by employing an anchoring agent with high sand content, mechanical anchoring means, or grouting reinforcement. The new technology has advantages in a high strength, imposing pre-tightening force, and giving full play to the bolt supporting potential. Hence, it can improve the control effect on surrounding rocks. All these could be helpful references for the design of bolt support in deep underground mines.展开更多
I firmly believe that of systems engineering is the requirement-driven force for the progress ofsoftware engineering, artificial intelligence and electronic technologies. The development ofsoftware engineering, artifi...I firmly believe that of systems engineering is the requirement-driven force for the progress ofsoftware engineering, artificial intelligence and electronic technologies. The development ofsoftware engineering, artificial intelligence and electronic technologies is the technical supportfor the progress of systems engineering. INTEGRATION can be considered as "bridging" the ex-isting technologies and the People together into a coordinated SYSTEM.展开更多
在科技创新快速迭代的背景下,开展负责任研究与创新(responsible research and innovation,RRI)能够预防人类跌入科技“进步陷阱”。运用制度语法学工具,廓析中央政府制定的42项RRI政策的制度轮廓,并结合目标群体社会建构与政策设计框...在科技创新快速迭代的背景下,开展负责任研究与创新(responsible research and innovation,RRI)能够预防人类跌入科技“进步陷阱”。运用制度语法学工具,廓析中央政府制定的42项RRI政策的制度轮廓,并结合目标群体社会建构与政策设计框架解析政策的规制机理。研究发现:我国政府日益重视RRI,并试图在政策设计中激发政策目标群体开展RRI的内生动力,但现有政策整体呈弱规制性,政策的贯彻落实需要多元主体配合。从制度规则的应用来看,制度规则在生物医药和人工智能这些科技发展迅猛的领域应用最多。具体而言,选择规则是政策设计中最常使用的规则类型,而其余6种制度规则的应用不充分。进一步解析政策规制机理发现,在规制类型上,通过建构优势者、依赖者、偏离者3种目标群体,打造出政策规制差序格局;在规制手段上,巧用框定、强化、修辞话语策略建构目标群体,构建出RRI框架;在规制强度上,开展宪法选择层、集体选择层、操作选择层目标群体社会建构,凝聚出政策规制强大合力。研究结论在理论方面为学者研究RRI议题提供了政策视角启示,在实践方面为学者研究RRI政策提供了制度语法学工具的方法论见解,也为我国政府更好地设计和完善RRI政策提供了理论参考,助力我国政府提升科技治理水平。展开更多
基金Projects(51409154,41772299)supported by the National Natural Science Foundation of ChinaProject(J16LG03)supported by the Shandong Province Higher Educational Science and Technology Program,China+1 种基金Projects(2015JQJH106,2014TDJH103)supported by the SDUST Research Fund,ChinaProject(201630576)supported by the Tai’an Scientific and Technologic Development Project,China
文摘Soft rock surrounding deep roadway has poor stability and long-term rheological effect. More and larger deformation problems of surrounding rock occur due to adverse supporting measures for such roadways, which not only affects the engineering safety critically but also improves the maintenance costs. This paper takes the main rail roadway with severely deformation in China＇s Zaoquan coal mine as an example to study the long-term deformation tendency and damage zone by means of in-situ deformation monitoring and acoustic wave testing technique. A three-dimensional finite element model reflecting the engineering geological condition and initial design scheme is established by ABAQUS. Then, on the basis of field monitoring deformation data, the surrounding rock geotechnical and theological parameters of the roadway are obtained by back analysis. A combined supporting technology with U-shaped steel support and anchor-grouting is proposed for the surrounding soft rock. The numerical simulation of the combined supporting technology and in-situ deformation monitoring results show that the soft rock surrounding the roadway has been held effectively.
基金Projects(51304125,51379114)supported by the National Natural Science Foundation of ChinaProject(BS2013NJ004)supported by Award Fund for Outstanding Young and Middle-Aged Scientist of Shangdong Province,ChinaProject(201301004)supported by the Innovation Fund for Postdoctor of Shandong Province,China
文摘In deep underground mining, the surrounding rocks are very soft with high stress. Their deformation and destruction are serious, and frequent failures occur on the bolt support. The failure mechanism of bolt support is proposed to solve these problems. A calculation theory is established on the bond strength of the interface between the anchoring agent and surrounding rocks. An analysis is made on the influence law of different mechanical parameters of surrounding rocks on the interfacial bond strength. Based on the research, a new high-strength bolt-grouting technology is developed and applied on site. Besides, some helpful engineering suggestions and measures are proposed. The research shows that the serious deformation and failure, and the lower bond strength are the major factors causing frequent failures of bolt support. So, the bolt could not give full play to its supporting potential. It is also shown that as the integrity, strength, interface dilatancy and stress of surrounding rocks are improved, the bond strength will increase. So, the anchoring force on surrounding rocks can be effectively improved by employing an anchoring agent with high sand content, mechanical anchoring means, or grouting reinforcement. The new technology has advantages in a high strength, imposing pre-tightening force, and giving full play to the bolt supporting potential. Hence, it can improve the control effect on surrounding rocks. All these could be helpful references for the design of bolt support in deep underground mines.
文摘I firmly believe that of systems engineering is the requirement-driven force for the progress ofsoftware engineering, artificial intelligence and electronic technologies. The development ofsoftware engineering, artificial intelligence and electronic technologies is the technical supportfor the progress of systems engineering. INTEGRATION can be considered as "bridging" the ex-isting technologies and the People together into a coordinated SYSTEM.
文摘在科技创新快速迭代的背景下,开展负责任研究与创新(responsible research and innovation,RRI)能够预防人类跌入科技“进步陷阱”。运用制度语法学工具,廓析中央政府制定的42项RRI政策的制度轮廓,并结合目标群体社会建构与政策设计框架解析政策的规制机理。研究发现:我国政府日益重视RRI,并试图在政策设计中激发政策目标群体开展RRI的内生动力,但现有政策整体呈弱规制性,政策的贯彻落实需要多元主体配合。从制度规则的应用来看,制度规则在生物医药和人工智能这些科技发展迅猛的领域应用最多。具体而言,选择规则是政策设计中最常使用的规则类型,而其余6种制度规则的应用不充分。进一步解析政策规制机理发现,在规制类型上,通过建构优势者、依赖者、偏离者3种目标群体,打造出政策规制差序格局;在规制手段上,巧用框定、强化、修辞话语策略建构目标群体,构建出RRI框架;在规制强度上,开展宪法选择层、集体选择层、操作选择层目标群体社会建构,凝聚出政策规制强大合力。研究结论在理论方面为学者研究RRI议题提供了政策视角启示,在实践方面为学者研究RRI政策提供了制度语法学工具的方法论见解,也为我国政府更好地设计和完善RRI政策提供了理论参考,助力我国政府提升科技治理水平。
