Seismic responses of utility tunnel-soil system were studied via shaking table model tests with considerations of two kinds of double box utility tunnels:with and without joint connections.These two testing utility tu...Seismic responses of utility tunnel-soil system were studied via shaking table model tests with considerations of two kinds of double box utility tunnels:with and without joint connections.These two testing utility tunnel models were made of galvanized iron wire and micro-concrete,and the ground was simulated by the dry standard sand through layered tamping treatment.The utility tunnel-soil system was subjected to horizontal vibration in uniaxial direction perpendicular to the longitudinal direction of tunnel model.Via instrumentations of earth pressure gauges,accelerometers and strain gauges,the earth pressure response,acceleration response and bending moment response were measured.The testing results show that the joint connections in the utility tunnel along the longitudinal direction play an important role in determining the characteristic of earth pressure response and bending moment response,whereas the effect of joint connections on acceleration response is less significant.In addition,the partition wall exhibits the consistent acceleration response with the side-wall of double box utility tunnel model under seismic condition.Based on the testing results,it is suggested that the joint connection should be taken reasonably into consideration during design and construction for engineering practice.展开更多
Choosing the best way for describing physical reality has always been standing in focus of research.Several methodologies have been developed based on classical mathematics,or statistics and also new disciplines-such ...Choosing the best way for describing physical reality has always been standing in focus of research.Several methodologies have been developed based on classical mathematics,or statistics and also new disciplines-such as soft-computing techniques-appeared.Petri Nets as one of the most naturalistic modeling methodologies are well suited to describe complex process in general.However in some fields of modeling the describing power of basic Petri Nets proved not to be robust enough,therefore several exten-sions were made to the original concept.Colored tokens(Colored Petri Nets),stochastic delayed streaming of mobile entities(Stochastic Petri Nets),object oriented architecture(Object Oriented Petri Nets),numerical(Numerical Petri Nets)and linguistic attributes(Fuzzy Petri Nets)broaden the range of capabilities.In some fields of problem solv-ing,usage of static and mobile knowledge bases is needed:e.g.,flexible manufacturing systems,or intelligent traffic simulation.These problems to be investigated involved new conceptual developments of Petri Nets and led to the introduction of Knowledge Attributed Petri Nets.At the same time distributed control in simulation appeared,intelligent agents supported the connection of mobile knowledge bases and static infer-ence engines in an effective way.The mentioned extensions brought general support in model synthesis,but some unsolved questions remained related to the implementation of intelligent mobile entities.This paper highlights a new level of AI controlled simulation introducing the Extended Knowledge Attributed Petri Nets that offer the capability of easy implementation of mobile inference engines and knowledge base,providing general mobile AI in Petri Nets.展开更多
基金supported by Natural Science Foundation of China(Grant Nos.52078086 and 51778092)Innovation Group Science Foundation of the Natural Science Foundation of Chongqing,China(Grant No.cstc2020jcyj-cxttX0003)State Education Ministry and the Fundamental Research Funds for the Central Universities(2019CDJSK04XK23).
文摘Seismic responses of utility tunnel-soil system were studied via shaking table model tests with considerations of two kinds of double box utility tunnels:with and without joint connections.These two testing utility tunnel models were made of galvanized iron wire and micro-concrete,and the ground was simulated by the dry standard sand through layered tamping treatment.The utility tunnel-soil system was subjected to horizontal vibration in uniaxial direction perpendicular to the longitudinal direction of tunnel model.Via instrumentations of earth pressure gauges,accelerometers and strain gauges,the earth pressure response,acceleration response and bending moment response were measured.The testing results show that the joint connections in the utility tunnel along the longitudinal direction play an important role in determining the characteristic of earth pressure response and bending moment response,whereas the effect of joint connections on acceleration response is less significant.In addition,the partition wall exhibits the consistent acceleration response with the side-wall of double box utility tunnel model under seismic condition.Based on the testing results,it is suggested that the joint connection should be taken reasonably into consideration during design and construction for engineering practice.
基金This project is supported by the grant TAMOP-4.2.2.B-10/1-2010-0009.
文摘Choosing the best way for describing physical reality has always been standing in focus of research.Several methodologies have been developed based on classical mathematics,or statistics and also new disciplines-such as soft-computing techniques-appeared.Petri Nets as one of the most naturalistic modeling methodologies are well suited to describe complex process in general.However in some fields of modeling the describing power of basic Petri Nets proved not to be robust enough,therefore several exten-sions were made to the original concept.Colored tokens(Colored Petri Nets),stochastic delayed streaming of mobile entities(Stochastic Petri Nets),object oriented architecture(Object Oriented Petri Nets),numerical(Numerical Petri Nets)and linguistic attributes(Fuzzy Petri Nets)broaden the range of capabilities.In some fields of problem solv-ing,usage of static and mobile knowledge bases is needed:e.g.,flexible manufacturing systems,or intelligent traffic simulation.These problems to be investigated involved new conceptual developments of Petri Nets and led to the introduction of Knowledge Attributed Petri Nets.At the same time distributed control in simulation appeared,intelligent agents supported the connection of mobile knowledge bases and static infer-ence engines in an effective way.The mentioned extensions brought general support in model synthesis,but some unsolved questions remained related to the implementation of intelligent mobile entities.This paper highlights a new level of AI controlled simulation introducing the Extended Knowledge Attributed Petri Nets that offer the capability of easy implementation of mobile inference engines and knowledge base,providing general mobile AI in Petri Nets.
