Jinping Ⅱ hydropower station is located in a high in-situ stress region in Southwest China. During the excavations of the transportation and drainage tunnels, more than 460 rockburst events were recorded in the trans...Jinping Ⅱ hydropower station is located in a high in-situ stress region in Southwest China. During the excavations of the transportation and drainage tunnels, more than 460 rockburst events were recorded in the transportation tunnel and 110 in the drainage tunnel, which has a serious and negative influence on the tunnels’ construction and the safety of staff and equipment. In the paper, the characters of rockburst patterns are analyzed for the transportation and drainage tunnels. The results are illustrated as follow: (1) Most of intensive rockbursts occur in the layer T2b, and continuous occurrences of rockbursts are more frequently observed than those in other layers. (2) The critical overburden depth of rockburst in the transportation tunnel is 600 m, and the length of the continuous occurrence section of rockburst is smaller than 25 m. The damaged depth of the rockburst has the tendency to increase with the increasing overburden depth, and the maximum damaged depth is over 3.5 m. (3) From east to west (west to east) in Jinping Ⅱ hydropower station, the rockburst usually takes place in the right (left) side of tunnel working face, and then the left (right) or roof of the tunnel. The total length of the continuous occurrence section of rockburst is 57.4%–62.2% of the overall rockburst length, followed by the rockbursts of flake-splitting type and other types. (4) Compared with the transportation tunnel, the intensity of rockburst in the drainage tunnel is higher while the length of the continuous occurrence section of rockburst is smaller. The rockburst section with length less than 10 m and depth of 1 m mainly occurs in the layer at a depth of 1 800–2 000 m. The influences of opening geometry and excavation method on the characteristics of the adjacent zone are great, but the influence of the stress among the tunnel group induced by excavation is relatively low.展开更多
为提高通信基站监控终端的可靠性和事件处理能力,本文介绍采用16位RISC架构嵌入式微处理器R8800实现基站监控终端的设计。利用Paradigm C++ 5.1集成环境编写监控终端控制程序,实现μC/OS-Ⅱ在R8800上的移植。通过实装调试,设计的任务程...为提高通信基站监控终端的可靠性和事件处理能力,本文介绍采用16位RISC架构嵌入式微处理器R8800实现基站监控终端的设计。利用Paradigm C++ 5.1集成环境编写监控终端控制程序,实现μC/OS-Ⅱ在R8800上的移植。通过实装调试,设计的任务程序能在硬件环境和操作系统下稳定工作,实现了监控终端对环境模拟量和开关量信息的采集,对智能电源、空调设备和通风系统的通信与控制,与区域监控中心进行远程通信。展开更多
基金Supported by the National Natural Science Foundation of China (40902086)the National Key Technology R&D Program in the 11th Five-year Plan of China (2008BAB29B01-5)
文摘Jinping Ⅱ hydropower station is located in a high in-situ stress region in Southwest China. During the excavations of the transportation and drainage tunnels, more than 460 rockburst events were recorded in the transportation tunnel and 110 in the drainage tunnel, which has a serious and negative influence on the tunnels’ construction and the safety of staff and equipment. In the paper, the characters of rockburst patterns are analyzed for the transportation and drainage tunnels. The results are illustrated as follow: (1) Most of intensive rockbursts occur in the layer T2b, and continuous occurrences of rockbursts are more frequently observed than those in other layers. (2) The critical overburden depth of rockburst in the transportation tunnel is 600 m, and the length of the continuous occurrence section of rockburst is smaller than 25 m. The damaged depth of the rockburst has the tendency to increase with the increasing overburden depth, and the maximum damaged depth is over 3.5 m. (3) From east to west (west to east) in Jinping Ⅱ hydropower station, the rockburst usually takes place in the right (left) side of tunnel working face, and then the left (right) or roof of the tunnel. The total length of the continuous occurrence section of rockburst is 57.4%–62.2% of the overall rockburst length, followed by the rockbursts of flake-splitting type and other types. (4) Compared with the transportation tunnel, the intensity of rockburst in the drainage tunnel is higher while the length of the continuous occurrence section of rockburst is smaller. The rockburst section with length less than 10 m and depth of 1 m mainly occurs in the layer at a depth of 1 800–2 000 m. The influences of opening geometry and excavation method on the characteristics of the adjacent zone are great, but the influence of the stress among the tunnel group induced by excavation is relatively low.
文摘为提高通信基站监控终端的可靠性和事件处理能力,本文介绍采用16位RISC架构嵌入式微处理器R8800实现基站监控终端的设计。利用Paradigm C++ 5.1集成环境编写监控终端控制程序,实现μC/OS-Ⅱ在R8800上的移植。通过实装调试,设计的任务程序能在硬件环境和操作系统下稳定工作,实现了监控终端对环境模拟量和开关量信息的采集,对智能电源、空调设备和通风系统的通信与控制,与区域监控中心进行远程通信。
