【作者】 李运良； 王占江； 文潮； 门朝举； 蔡宗义； 吴祖堂； 陈立强； 李进； 卢强；

【Author】 Wang Zhanjiang,Li Yunliang,Wen Chao,Men Chaoju,Cai Zongyi,Li jin,Lu qiang,Guo zhiyun (Northwest Institute of Nuclear Technology,Xi’an 710024 China)

【机构】 西北核技术研究所；

【摘要】 沟槽隔震技术是降低爆破危害的重要手段之一。在本文中,通过人工构造了一条东西长10m、南北宽0.6m、深3m的竖直沟槽,用以模拟天然大沟槽的隔震效应。在沟槽南北两侧对称布设了4发当量50gTNT、埋深1.1m的地下化爆实验。实验的特点为沟槽与炮孔距离较近,沟槽阻隔准球面波的有效区域相对较大,且炮孔位于沟槽的两侧,即研究了沟槽阻断地震波的减震效果,也研究了沟槽自由面反射干扰产生的减震效果。炮孔距沟槽越近,沟槽隔震效果越好,且由于沟槽自由面反射效应,对与炮孔同侧的远区地震面波,也能起到一定的减震效果。本文还尝试了通过直达波与反射波的时间差,反算出未受反射波干扰的直达地运动波及沟槽自由面反射波,效果良好。更多还原

【Abstract】 The technology of earthquake wave’s obstruct of ditch is one of the possible means to reduce the influence of blasting vibration.In this article,in order to simulating the natural ditch,a slot whose East-West length is 10m,North-South width is 0.6m,depth is 3m,is excavated through manual work.Four underground explosion tests on the North-South sides of ditch,whose equivalent is 50gTNT,depth of burial is 1.1m,were arranged.The feature of this experiment is the small distance between the blasting holes and ditch’s rim.The scope of obstructing spherical wave by ditch is relatively big.The blasting holes located on the North-South sides symmetrical.The damping vibration both by ditch’s obstruct and free face’s reflecting is studied.The distance between blasting holes and the ditch’s rim is shorter;the better damping vibration effect is cased by ditch.Because of free face’s reflecting,some damping vibration effect to far zone seismic surface wave is produced in the same side with blasting holes of ditch.The undisturbed and reflecting ground motion waves are worked out through the reaching time difference between the undisturbed and reflecting waves.更多还原