含软弱夹层顺层岩体爆破效应模拟试验研究
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摘要
以某石灰石矿采场黏土质夹层物为软弱夹层原料嵌入预制水泥砂浆体制作含软弱夹层的顺层岩体台阶爆破模型,进行了不同爆破条件下含软弱夹层顺层岩体的爆破模型试验。试验结果表明:爆破后将软弱夹层空间展布分为4个区域:爆腔区、压密区、影响区和无扰动区,其中爆腔区、压密区和影响区构成了模型的层裂区;压密区密度随爆源距离的增加呈先增大后减小的规律,最后减小至爆破前密度。模型的层裂范围随软弱夹层含水率、最小抵抗线、爆破药量的增加而增加,随软弱夹层厚度的增加出现先增大后减小的规律。不同药包位置的试验证明,改变炮孔的装药位置可以降低或克服含软弱夹层的岩体的层裂作用。
The bedding rock with intercalation for bench blasting model is made by limestone mine clay which embedded in precast cement mortar models.Blasting model test of bedding rock with intercalation were carried out under different blasting conditions.The test results show that the intercalation after blasting is divided into four regions:blasting cavity region,tightness region,affected region and undisturbed region.The blasting cavity region,tightness region,affected region constitute the lamination region.Tightness density increases first and then decreases with source distance,and finally reduces to the density before blasting.The lamination range of the model increases with the increase of intercaltion water content,source distance and explosive dosage.And the lamination range increases at first,and then decreases with the increase of intercalation thickness.The experiment which the explosive cartridge is located at different positions proved that different charge locations in the blast hole can reduce or overcome lamination effect of the bedding rock with intercalation.
The bedding rock with intercalation for bench blasting model is made by limestone mine clay which embedded in precast cement mortar models.Blasting model test of bedding rock with intercalation were carried out under different blasting conditions.The test results show that the intercalation after blasting is divided into four regions:blasting cavity region,tightness region,affected region and undisturbed region.The blasting cavity region,tightness region,affected region constitute the lamination region.Tightness density increases first and then decreases with source distance,and finally reduces to the density before blasting.The lamination range of the model increases with the increase of intercaltion water content,source distance and explosive dosage.And the lamination range increases at first,and then decreases with the increase of intercalation thickness.The experiment which the explosive cartridge is located at different positions proved that different charge locations in the blast hole can reduce or overcome lamination effect of the bedding rock with intercalation.
引文
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[15]王仲琦,张奇,白春华.爆炸挤压粘土密度变化过程的数值模拟[J].岩土工程学报,2001,23(3):350-353.Wang Zhongqi,Zhang Qi,Bai Chunhua.Numerical simulation onvariation of density of the soil compacted by explosion[J].ChineseJounal of Geotechnical Engineering,2001,23(3):350-353.
[2]许宝田,钱七虎,阎长虹,等.多层软弱夹层边坡岩体稳定性及加固分析[J].岩石力学与工程学报,2009,28(S2):3959-3964.Xu Baotian,Qian Qihu,Yan Changhong,et al.Stability and strength-ening analyses of slope rock mass containing multi-weak intealayers[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(S2):3959-3964.
[3]许宝田,阎长虹,陈汉永,等.边坡岩体软弱夹层力学特性试验研究[J].岩土力学,2008,29(11):3077-3081.Xu Baotian,Yan Changhong,Chen Hanyong,et al.Experimentalstudy of mechanical property of weak intercalated layers in slope rockmass[J].Rock and Soil Mechanics,2008,29(11):3077-3081.
[4]张顶立,王悦汉,曲天智.夹层对层状岩体稳定性的影响分析[J].岩石力学与工程学报,2000,19(2):140-144.Zhang Dingli,Wang Yuehan,Qu Tianzhi.Influence analysis of inter-band on stability of stratified rockmass[J].Chinese Journal of RockMechanics and Engineering,2000,19(2):140-144.
[5]刘文方,隋严春,周菊芳,等.含软弱夹层岩体边坡的突变模式分析[J].岩石力学与工程学报,2006,25(S1):2663-2669.Liu Wenfang,Sui Yanchun,Zhou Jufang,et al.Catastrophe analysisof rock mass slope with weak intercalated layers[J].Chinese Journalof Rock Mechanics and Engineering,2006,25(S1):2663-2669.
[6]刘红星,苏爱军,王永平,等.软弱夹层对斜坡稳定性的影响分析[J].武汉理工大学学报(交通科学与工程版),2004,28(5):765-770.Liu Hongxing,Su Aijun,Wang Yongping,et al.Analysis of affectionof weak seam to slope stability[J].Journal of Wuhan University ofTechnology(Transportation Science&Engineering),2004,28(5):765-770.
[7]杜晓丽,宋宏伟,魏京胜.地震对软弱夹层边坡稳定性影响数值模拟研究[J].三峡大学学报(自然科学版),2010,32(1):39-42.Du Xiaoli,Song Hongwei,Wei Jingsheng.Numerical simulation re-search on stability of slope with weak sandwich under seismic load-ings[J].Journal of China Three Gorges University(Natural Sci-ences),2010,32(1):39-42.
[8]张继春,宋小林,郭学彬,等.深孔爆破条件下岩体软弱夹层变形特性研究[J].中国铁道科学,2008,29(2):77-81.Zhang Jichun,Song Xiaolin,Guo Xuebin,et al.Study on the deform-ation characters of weak intercalation in layered rock mass underdeep-hole blasting[J].China Railway Science,2008,29(2):77-81.
[9]宋小林,张继春,郭学彬,等.软弱顺倾岩体爆破层裂的准静态力学模型应用研究[J].爆炸与冲击,2008,28(6):565-571.Song Xiaolin,Zhang Jichun,Guo Xuebin,et al.Applied study on aquasi-static mechanical model for lamination of weak intercalation inlayered rock slope caused by blasting[J].Explosion and ShockWaves,2008,28(6):565-571.
[10]肖定军,张继春,刘恺德,等.爆破作用下层间充填物运动规律的试验研究[J].金属矿山,2008,37(10):32-34.Xiao Dingjun,Zhang Jichun,Liu Kaide,et al.Motion law of the lay-ered filling solids under blasting[J].Metal Mine,2008,37(10):32-34.
[11]张继春,肖正学,郑爽英.含软弱夹层岩体爆破的夹层土运动特征试验研究[J].岩石力学与工程学报,2009,28(8):1697-1703.Zhang Jichun,Xiao Zhengxue,Zheng Shuangying.Experimentalstudy of motion characteristics of weak intercalation in rock massblasting[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(8):1697-1703.
[12]郝亚飞,郭学彬,张继春,等.爆破对软弱夹层的影响[J].西南科技大学学报,2008,23(4):29-32.Hao Yafei,Guo Xuebin,Zhang Jichun,et al.Effects of blasting onthe weak intercalation[J].Journal of Southwest University of Sci-ence and Technology,2008,23(4):29-32.
[13]王代华,刘军,柏德强,等.露天边坡在爆破作用下损伤特征的试验研究[J].煤炭学报,2004,29(5):532-535.Wang Daihua,Liu Jun,Bai Deqiang,et al.Experimental study onthe damage characteristics of the slope under blasting[J].Journalof China Coal Society,2004,29(5):532-535.
[14]胡刚.基于岩体声波损伤特性的露天台阶爆破试验[J].煤炭学报,2009,34(7):917-921.Hu Gang.Experiment of open-pit bench blast based on the soundwave-induced damage properties of rock masses[J].Journal of Chi-na Coal Society,2009,34(7):917-921.
[15]王仲琦,张奇,白春华.爆炸挤压粘土密度变化过程的数值模拟[J].岩土工程学报,2001,23(3):350-353.Wang Zhongqi,Zhang Qi,Bai Chunhua.Numerical simulation onvariation of density of the soil compacted by explosion[J].ChineseJounal of Geotechnical Engineering,2001,23(3):350-353.
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