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Rockfall Mitigation Techniques and Its Characteristics

YE Si-qiao,CHEN Hong-kai,TANG Hong-mei(Institute of Geotechnical Engineering,Chongqing Jiaotong University,Chongqing 400074,China)  
Rockfall is one of China's three major geological hazards.Its mitigation techniques can be divided into active and passive mitigation techniques.The active techniques is suitable for large-scale rockfall which is well investigated.And it is recommended that priority can be given to support technique and be careful to adopt removal measures.The passive mitigation techniques is suitable for the protection of thread-like project threatened by rockfall hazards.Its advantage is the technique can fully and effectively intercept the moving rockfall.But subject to restrictions its interception capability,the passive mitigation techniques is often used to intercept rockfall which size is below a few cubic meters.The effecitive design of passive mitigation techniques depends on the reliability of calculation results of rockfall motion parameters,such as the movement path,jumping height,velocity,kinetic parameters.The rockfall restraining nets and semi-rigid rockfall retaining wall,avoiding some shortcomings for traditional rigid rockfall retaining wall,are better measures for passive mitigation.For specific rockfall mitigation project,combination use of active and passive mitigation techniques is worthy of recommendation.
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