倾角对裂隙岩体力学特性影响试验模拟研究
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摘要
为了解决工程中遇到的裂隙岩体的开挖与防护问题,用水泥砂浆制作试样,模拟具有不同倾角的贯通裂隙岩体,利用电液伺服万能试验机和分离式霍普金森压杆分别对试样施加静、动荷载,分析倾角对裂隙岩体静、动态力学性能的影响.结果表明,裂隙岩体的破坏具有脆性破坏的特征;其强度具有应变率敏感性,随着应变率的提高,强度也得到提高;倾角对裂隙岩体的静、动态力学性能有影响,静态荷载下的抗压强度在裂隙倾角为45°时最小,0°和90°时最大,而动力荷载下的抗压强度则是在裂隙倾角为30°时最小,90°时最大.
Rock mass fracture data was collected from cement specimens to help solve engineering problems related to the digging and support of fractured rock masses.The specimens were made from cement and are intended to simulate rock masses that have different obliquities in cross-sectional fracture.The specimens were loaded with a static load or with a dynamic load using an electro-hydraulic servo test machine or a split Hopkinson pressure bar.The influence of obliquity on the mechanical characteristics of the fractured rock mass was analyzed.The results are that the fractured rock mass shows the characteristics of brittle failure.The strength is sensitive to the strain rate: the strength increase with an increase in the strain rate.There is difference between the static and dynamic fracture of the rock mass related to obliquity.The lowest and the highest compression strength of the fractured rock mass under static loads occurred when the obliquity was 45° and 0° or 90°.Under dynamic loads the lowest and highest strengths occurred at 30° and 90°.
Rock mass fracture data was collected from cement specimens to help solve engineering problems related to the digging and support of fractured rock masses.The specimens were made from cement and are intended to simulate rock masses that have different obliquities in cross-sectional fracture.The specimens were loaded with a static load or with a dynamic load using an electro-hydraulic servo test machine or a split Hopkinson pressure bar.The influence of obliquity on the mechanical characteristics of the fractured rock mass was analyzed.The results are that the fractured rock mass shows the characteristics of brittle failure.The strength is sensitive to the strain rate: the strength increase with an increase in the strain rate.There is difference between the static and dynamic fracture of the rock mass related to obliquity.The lowest and the highest compression strength of the fractured rock mass under static loads occurred when the obliquity was 45° and 0° or 90°.Under dynamic loads the lowest and highest strengths occurred at 30° and 90°.
引文
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[3]李廷,席道瑛,徐松林.动荷载作用下岩石非线性弹性相应研究[J].地学前沿,2006,13(3):206-212.LI Ting,XI Dao-ying,XU Song-lin.Investigation ofthe non-linear elastic responses of rock under impactloading[J].Earth Science Frontiers,2006,13(3):206-212.
[4]GAO Wen-jiao,SHAN Ren-liang,WANG Gong-cheng,et al.Constitutive relation of Yunjialing an-thracite under medium strain rate[J].Journal ofChina University of Mining&Technology,2007,17(1):126-132.
[5]东兆星,单仁亮.高应变率下岩石本构特性的研究[J].工程爆破,1999,5(2):5-9.DONG Zhao-xing,SHAN Ren-liang.Study on con-stitutive properties of rocks under high strain rates[J].Engineering Blasting,1999,5(2):5-9.
[6]盛金昌,速宝玉,詹美礼.裂隙岩体的弹塑性本构模型及有限元分析[J].河海大学学报:自然科学版,1999,27(5):27-33.SHENG Jin-chang,SU Bao-yu,ZHAN Mei-li.Aconstitutive model of jointed rock masses and its fi-nite element analysis[J].Journal of Hohai Universi-ty:Natural Sciences,1999,27(5):27-33.
[7]张平,李宁,贺若兰,等.动载下两条断续预制裂隙贯通机制研究[J].岩石力学与工程学报,2006,25(6):1210-1217.ZHANG Ping,LI Ning,HE Ruo-lan,et al.Mecha-nism of fracture coalescence between two pre-existingflaws under dynamic loading[J].Chinese Journal ofRock Mechanics and Engineering,2006,25(6):1210-1217.
[8]张平,李宁,贺若兰,等.不同应变速率下非贯通裂隙介质的力学特性研究[J].岩土工程学报,2006,28(6):750-755.ZHANG Ping,LI Ning,HE Ruo-lan,et al.Me-chanical properties of fractured media containing in-termittent fractures at different strain rates[J].Chi-nese Journal of Geotechnical Engineering,2006,28(6):750-755.
[9]张海波,王媛,王鲁明,等.裂隙岩体动力特性的试验模拟研究[J].河海大学学报:自然科学版,2007,35(3):309-311.ZHANG Hai-bo,WANG Yuan,WANG Lu-ming,et al.Experimental research on dynamic characteris-tics of fractured rock mass[J].Journal of Hohai Uni-versity:Natural Sciences,2007,35(3):309-311.
[10]胡时胜.霍布金森压杆技术[J].兵器材料科学与工程,1991,11:40-47.HU Shi-sheng.The technique of Hopkinson pres-sure bar[J].Ordnance Material Science and Engi-neering,1991,11:40-47.
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