| With the rapid development of China's economy,geotechnical engineering construction has ushered in an unprecedented golden period,and a large number of long-term tunnels,high-steep slopes and other large infrastructure projects have emerged.Because these projects are mostly distributed in remote areas where geological conditions and natural environments are complex,under the influence of various factors such as construction disturbances,geological disasters,and external loads,large-scale geotechnical engineering safety accidents occur frequently,resulting in serious casualties,huge Economic loss and bad social impact.Safety monitoring is an effective method for ensuring the safety of geotechnical engineering construction and operation and avoiding safety accidents.However,common monitoring equipment currently used in geotechnical engineering,such as electricity and fiber optics,has the problem of collaborative communal mining.The systems are isolated and serious Because of the phenomenon of "isolated information resources",it is urgent to develop geotechnical engineering multiple data gathering and remote monitoring platforms to achieve multi-parameter heterogeneous monitoring equipment for collaborative acquisition and remote monitoring.In order to solve the issue mentioned above,the multi-monitoring equipment collaborative communal mining and remote monitoring system has been developed,the interface and bus which is compatible to multiple communication protocols has been used firstly.Then,the hardware of monitoring data aggregation and wireless transmission system has been constructed,followed by the programing of the software in the server of management layer.A lossless data compression algorithms has been studied and implemented in the firmware.The developed system is then through laboratory tests and practical engineering applications,the reliability and stability of the system are verified.The specific tasks are as following:A STM32 micro-processor based hardware was designed,RS485 interface circuit is designed,data is read in master-slave mode,and data aggregation is realized.Then a GPRS based wireless transmission module was designed to transmit the collected data to the long-distance server.A dual power was designed to realize continuously power supplying.A touch panel was utilized to view data of monitoring instruments,switch the frequency,and realize other GUI functions.Additionally,the system includes some extra functions,such as SD card based local data storage,environmental parameters monitoring and faulty warning etc..The software in the server has been developed using C#.The software connect the management layer and the transmission layer,and provide target IP and port number for the GPRS module.Moreover,it defined the data communication format for the command and data,and then realized the sending of acquisition commands and the reception of data returned by the transport layer hardware,and parses,displays,stores,and alerts the data.Adopts LZW-based data compression algorithm and STM32 DMA technology,it realizes data lossless compression based on hardware programming;Through multiple hardware lossless data compression experiments,the compression effects of three compression data volumes of 10 frames,100 frames,and 300 frames were compared,and the single data compression amount most suitable for this system was selected.The system was debugged in the lab and then utilized in the tunnel model tests,which validate its feasibility,reliability and stability.The system greatly promotes the safety monitoring efficiency of geotechnical engineering,realizes the collaborative collection of fiber optic systems and electronic systems,as well as the data remote transmission of the multiple systems.Therefore,it is significant to avoid the incidents and guarantee the safe construction and operation of the geotechnical engineering. |
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