引汉济渭工程秦岭输水隧洞4~#施工支洞岩爆预测及预防处理措施

发布时间：2019-04-02 17:17

【摘要】：秦岭输水隧洞埋深很大,开挖时经常发生岩爆。为降低岩爆对人员和设备造成伤害,4~#洞引进了大连理工大学的微震监测技术,进行超前检测预报试验,对预测到的岩石应力比较集中的部位进行加强支护和超前支护。从实施效果来看,总共发送17份微震监测预报报告,其中准确预测了轻微岩爆4次、中等岩爆4次,准确率约50%。通过加密检测,准确率能达到71%,可大大减少安全事故的发生。通过爆破,可释放及消除掌子面应力。若配合超前支护,后期加强支护,可达到一定预防效果,但也存在一定风险。从现场实施情况来看,这样的预测、预防以及加强支护措施能够在一定程度上改善岩体内部的应力分布状况,使其开挖后重新调整。但此法只适用于钻爆施工,对于TBM施工的工作面很难做出相关预防,因目前还没有找到超前应力释放和超前支护的办法。
[Abstract]:The buried depth of Qinling water conveyance tunnel is very large and rock burst often occurs during excavation. In order to reduce the damage caused by rock burst to people and equipment, the micro-earthquake monitoring technology of Dalian University of Technology was introduced into the 4 # hole to carry out the test of advance detection and prediction, and to strengthen the support and the advance support of the predicted parts where the rock stress was concentrated. A total of 17 micro-earthquake monitoring and prediction reports were sent, of which 4 minor rockburst and 4 moderate rockburst were accurately predicted, with an accuracy of about 50%. Through encryption detection, the accuracy can reach 71%, can greatly reduce the occurrence of security accidents. The stress of the palm surface can be released and eliminated by blasting. If supporting in advance and strengthening support in later stage, the preventive effect can be achieved, but there is also a certain risk. According to the field practice, the prediction, prevention and reinforcement measures can improve the stress distribution in rock mass to a certain extent, and adjust the stress distribution after excavation. However, this method is only suitable for drilling and blasting construction, and it is very difficult to make relevant prevention for the working face of TBM construction, because there is no way to release the advance stress and advance the support at present.
【作者单位】：陕西省引汉济渭工程建设有限公司;
【基金】：国家重点研发计划项目(2016YFC0401802) 2013年陕西省科技统筹创新工程计划项目(2013KTZB-03-01-01)
【分类号】：TV554

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