Studies on classification,criteria and control of rockbursts

This paper attempts to present the findings involving rockbursts classification, rockburst failure criteria, and related control measures. Experimental investigations were performed using the strainburst testing machine and impact-induced rockburst testing machine. According to the stress paths and experimental methods, rockbursts were classified into two major groups, i.e. the strainbursts and impact-induced bursts. The mechanisms and criteria of rockburst obtained from experimental investigations were discussed. Then, the developments of constant-resistance and large-deformation bolt （CRLDB）, which can adapt itself to the external loading at a constant resistance by elongating continually, were introduced. The deformation energy Of country rocks with large deformation can be absorbed by CRLDBs. Finally, the principles and the experimental results for control and prevention of rockburst using the CRLDBs were presented.

长距离带状无线传感器网络路由协议设计

带状网络的长带状特性会影响无线传感器网络路由协议的性能,导致网络出现"热区"。针对该问题,提出一种能量均衡的多跳路由协议CRLDB。该协议主要采用非均匀分簇的思想,引入备选簇首竞争半径的概念和相应的竞争策略,并加入最优簇首个数、节点剩余能量和周围邻居节点个数的簇首选择机制,使节点的剩余能量和传输能量达到平衡。NS2仿真实验结果证明,与LEACH和LEACH-C协议相比,CRLDB在网络的生存时间、整体能耗和基站收到的数据量这3个性能指标上有较大程度的提高,能更好地均衡网络的能量消耗,提高网络的生命周期。