Coal Mining Ground Subsidence Disaster Chain Information Model And Geographic Information Service Aggregation

The geological environment is transformed gradually increased by the coal mining,causing and aggravating disasters such as land subsidence and surface construction damage.The disaster events caused by coal mining do not exist in isolation,while it represents as the continuous evolution of the chain structure that cause more serious damage.Based on the evolutionary mechanism of the disaster chain,and master its occurrence,development and transformation rules,as well as the characteristics and structural analysis,it can provide a theoretical basis for the informatization description of the disaster chain.On the other hand,in the existing literature,there is a shortage of spatio-temporal semantic relations and dynamic descriptions of the evolutionary process.By now,there is no unified and comprehensive modeling mechanism to describe the disaster process for the different types of disaster chain processes.Therefore,in this paper,we establishes an universal modeling frameworks for the disaster chain,and apply it to the analysis of the evolution process of mine ground subsidence chain.The evolutionary process of disasters chains is a complicated temporal and spatial change process.Aiming at the complex disaster chain process,based on the hierarchical description method,this study intends to combine the disaster chains with GIS,a top-down refinement method for modeling the complex disaster chain evolution process,was proposed in this article--the Evolution Process Multi-level Description for a Hazards Chain(EPMDHC).The semantic description of a disaster chain is realized at the phenomenon layer,changing element layer,abstract semantics association layer,and resource implementation layer.Through modeling the spatio-temporal process of disaster chain,it not only expresses the spatial relationship between spatial entities,but also describes their temporal relationship;and establishes a delivering process model,revealing the disaster chain evolution mechanism.It reveals the evolution mechanism of the disaster chain through establishing the transmission process model under the constraints of its spatio-temporal semantics.Under the constraint of EPMDHC,based on the five-tuple description model of disaster chain and the eight-tuple model of disaster events in the change element layer and abstract semantic association layer,the subsidence evolution process in the "coal mined area—mine ground subsidence—building damage" disaster chain is analyzed.Extracting the existing status parameters,and calculating the response state parameters,so as to establish the synergistic coupling relationship with the monitoring data.The dynamic simulation and evolution phases of disaster evolvement process are divided through the monitoring data information.The process of the lantency phase,onset phase,active phase,recovery phase will be further simulated.And on this basis,the spatio-temporal semantic and the conceptual model are established.The reasonable mapping relationship in the dynamic management of the ground subsidence disaster chain is established,which involve spatio-temporal objects,evolutionary processes,states,and constraints rules.The storage model is also built to provide the model analysis basis for the whole process of dynamic management.The Mine ground subsidence chain Simulation and Emergency Warning service Chain aggregation Process(MSDGSAP)was established based on the modeling of the spatio-temporal process of disaster chains.The MSDGSAP is described formally by the Business Process Execution Language(BPEL)which has become the de facto standard in the Web services composition arena.The stochastic Petri net(SPN)is introduced,then conversion rules was built to convert the BPEL model to SPN model.With the accessibility analysis functions of the SPN,the correctness of the models is verified.In the following,with the help of another mathematical analysis and calculation function of SPN,the performance analysis of the service chain combination model which includes response time,reliability,and universality is carried out by establishing the corresponding Markov chain based on isomorphic relation between SPN and Markov chain.The results show that the MSDGSAP created by this paper can provide data services support,and can be used as a decision-making assistant for disaster prevention.with the assistance of MSDGSAP,the decision-makers can detect the information representation changes in time before the formation of a disaster,and take reasonable disaster prevention measures,which can meet the demands of the mine emergency and early warning service.Finally,establishing the technology achieve overall framework of the MSDGSAP model from the data layer,service layer,application layer.Under the open source Geographic Information Services software GeoServer,Openlayers and other technical support,we can achieve a interoperable,reusable,scalable shared management platform.In the process of the specific implementation,when passing page information,the Asynchronous JavaScript and XML(Ajax)is introduced to solve the deferred response in the interaction of the asynchronous data,which can improve the application performance,accelerate the access speed,and it is verified the feasibility and effectiveness from the system implementation.