砂质黏土中不同深度爆炸自由场地冲击参数预计方法研究

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摘要根据爆炸地冲击试验的主要影响因素，运用量纲分析方法推导出爆炸地冲击参数的经验表达式。由砂质黏土中不同深度爆炸地冲击试验所得的地冲击应力峰值衰减曲线可以看出，装药比例埋深变化范围为－0.2～1.0 m/kg1/3，装药比例埋深对地冲击应力峰值的大小有较大影响，但应力峰值的衰减规律是一致的，即应力峰值经验公式的衰减指数大致相同，只是衰减系数随装药比例埋深的增加而增大。当装药比例埋深达到0.80 m/kg1/3以后，地冲击应力峰值衰减曲线之间的间距已经很小，这说明装药到此比例埋深以后装药比例埋深对爆炸地冲击参数的影响不再明显。在上述砂质黏土中不同深度爆炸自由场地冲击衰减规律的基础上，以“等效当量埋深系数”定义同一介质在相同比例距离上产生相同地冲击强度的2种不同深度爆炸装药量之间的关系，并运用此系数给出砂质黏土中不同深度爆炸自由场地冲击参数的预计方法，为地下工程抗爆研究与结构设计提供荷载依据。

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关键词 ：爆炸力学, 砂质黏土, 量纲分析, 地冲击, 等效当量埋深系数

Abstract：On the basis of the main factors affecting the test of ground shock induced by explosion，the empirical formulae of ground shock parameters are deduced by means of dimensional analysis. With the data of field tests in sandy clay，the attenuation curves of peak stress which is an important parameter of ground shock at different scaling depths of burst(SDOB) are drawn out. It can be concluded from the curves that the SDOB，ranging from －0.20 m/kg1/3 to 1.00 m/kg1/3，has great influence on peak stress of ground shock；and the tendencies of attenuation curves of peak stress at different SDOB are in concert. That is to say，the empirical formulae of peak stress at different SDOB have the same attenuation exponent；and the attenuation coefficient of empirical formulae will enlarge with the increasing SDOB. When the SDOB are close to 0.80 m/kg1/3，the space between the attenuation curves of peak stress of ground shock is already very small，which indicates that SDOB have no obvious effect on the parameters of ground shock after it reaches 0.80 m/kg1/3. When two explosions at different SDOB in one medium produce the same ground shock magnitudes in the same scaling distance，the relationship between the explosive charge with different depths in the yield of above two explosions is defined by“DOB coefficient of equivalent yield”. According to the attenuation law of peak stress，the prediction method of ground shock parameters in free field at different SDOB in sandy clay has been given with DOB coefficient of equivalent yield，which provides the computing method of explosion load for the antiknock study and structure design during underground construction.

Key words： explosion mechanics sandy clay dimensional analysis ground shock depths of burst(DOB) coefficient of equivalent yield

收稿日期: 2011-04-15

引用本文:

叶亚齐1，2，任辉启3，李永池1，吴祥云3，姚哲芳1. 砂质黏土中不同深度爆炸自由场地冲击参数预计方法研究[J]. 岩石力学与工程学报, 2011, 30(9): 1918-1923.
YE Yaqi1，2，REN Huiqi3，LI Yongchi1，WU Xiangyun3，YAO Zhefang1. STUDY OF PREDICTION OF GROUND SHOCK PARAMETERS IN FREE FIELD AT DIFFERENT DEPTHS OF BURST IN SANDY CLAY. , 2011, 30(9): 1918-1923.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I9/1918

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