摘要
针对早龄期喷层混凝土与围岩粘结面近区介质的动态冲击问题,利用Φ75mmSHPB试验装置,分别对龄期为3天、7天、10天喷层混凝土-围岩组合体试件进行SHPB试验,对其应力波传播规律及其动态力学特性进行了研究。试验结果表明:透射系数与冲击速度和混凝土龄期密切相关,随冲击速度的增大,不同龄期试件透射数均呈减小的变化趋势,相同冲击速度下,透射系数随试件龄期的增大而增大;随着应变率的增大,试件混凝土破坏模式由张应变破坏向压剪破坏转变,岩石呈现出张拉破坏特征;组合体动态抗压强度及动态强度增长因子随应变率的增大而增大;应变率大于80 s-1时,3天龄期试件表现出塑性特性,7天和10天龄期试件则表现出脆性特性。
Abstract
In order to investigate the dynamic response problem of the medium around the adhesive surface made by the adherence of early age sprayed concrete on rock, a split Hopkinson pressure bar (SHPB) of 75 mm in diameter were adopted to study the stress wave propagation rules and dynamic mechanical properties of the sprayed concrete-surrounding rock combined bodies at the age of 3 d, 7 d and 10 d.The experimental results show that the transmission coefficient is closely related to the impact velocity and the age of concrete.It will decrease as with impact velocity for the specimens of 3 d, 7 d and 10 d.The transmission coefficient increases with concrete age under the same experimental velocity.The damage degree will increases gradually as the growth of the strain rate.The failure pattern of the concrete changes from tearing strain damage to crushing damage, and the rock presents the tensile failure mode.The dynamic compressive strength and the dynamic strength increasing factor increase with the growth of strain rate.When the strain rate is beyond 80 s-1, it shows the plastic property for specimens at the age of 3 d and brittle property for specimens at the age of 7 d and 10 d.
关键词
喷层混凝土-围岩组合体 /
混凝土龄期 /
透射系数 /
破坏模式 /
动态抗压强度
{{custom_keyword}} /
Key words
sprayed concrete-surrounding rock combined body /
concrete age /
transmission coefficient /
failure pattern /
dynamic compressive strength
{{custom_keyword}} /
郭东明1,2,闫鹏洋1,凡龙飞1,杨 俊1,薛 磊1,李妍妍1.
喷层混凝土-围岩组合体波动特性及动力特性研究[J]. 振动与冲击, 2018, 37(24): 85-91
GUO Dongming1,2, YAN Pengyang1, Fan Longfei1, YANG Jun1, XUE Lei1,LI Yanyan1.
A study on the stress wave characteristics and dynamic mechanical property of the sprayed concrete-surrounding rock combined body[J]. Journal of Vibration and Shock, 2018, 37(24): 85-91
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 袁 璞,徐 颖,薛俊华,等. 锚固支护深部巷道爆破开挖模型试验研究[J]. 岩石力学与工程学报,2016,
35(9):1830-1836.
YUAN Pu,XU Ying,XUE Junhua,et al. Model test of anchorage deep tunnel in blasting excavation[J]. Chinese Journal of Rock Mechanics and Engineering,2016,35(9): 1830-1836.
[2] 杨仁树. 我国煤矿岩巷安全高效掘进技术现状与展望[J]. 煤炭科学技术,2013,41(9):18-23.
YANG Renshu. Present status and outlook on safety and high efficient heading technology of mine rock roadway in China[J]. Coal Science and Technology,2013,41(9):18-23.
[3] 王建秀,邹宝平,胡力绳. 隧道及地下工程光面爆破技术研究现状与展望[J]. 地下空间与工程学报,2013, 9(4):800-807.
WANG Jianxiu,ZOU Baoping,Hu Lisheng. Advance and trend in smooth blasting technology for tunnel and underground engineering[J]. Chinese Journal of Underground Space and Engineering,2013,9(4):800-807.
[4] 鲁军纪,褚怀保,叶红宇. 中深孔全断面切缝管定向断裂爆破技术应用研究[J]. 金属矿山,2015,(8):44-47.
LU Junji,CHU Huaibao,YE Hongyu. Research on middle-deep hole directional fracture blasting technology of cut tube in the whole section[J]. Metal Mine,2015,(8):44-47.
[5] 刘殿书,李胜林. 爆破工程[M].北京:科学出版社,2011.
LIU Dianashu,LI Shenglin. Blasting engineering[M]. Beijing:Science Press,2011.
[6] 丁国博,许金余. 早强 EPS 混凝土动态压缩力学行为的SHPB试验研究[J]. 混凝土,2011,(1):28-33.
DING Guobo,XU Jinyu. SHPB experiment research on dynamic compressed mechanical behavior of early-strengthened EPS concrete[J]. Concrete,2011,(1):28-33.
[7] 李夕兵,王世鸣,宫凤强,等. 不同龄期混凝土多次冲
击损伤特性试验研究[J]. 岩石力学与工程学报,2012,
31(12):2465-2472.
LI Xibing,WANG Shiming,GONG Fengqiang,et al. experimental study of damage properties of different ages concrete under multiple impact loads[J]. Chinese Journal of Rock Mechanics and Engineering,2012,31(12):526-533.
[8] 王世鸣,李夕兵,宫凤强,等. 静载和动载下不同龄期混凝土力学特性的试验研究[J]. 工程力学,2013,30(2):143-149.
WANG Shiming,LI Xibing,GONG Fengqiang,et al. Experimental study on mechanical properties of different ages concrete under static and dynamic load[J]. Engineering Mechanics,2013,30(2):143-149.
[9] 王世鸣.冲击荷载下早龄期混凝土力学和损伤特性的试验研究[D]. 长沙:中南大学,2014.
WANG Shiming. Experimental study on the mechanical properties and damage performance of early concrete
under dynamic loading[D]. Changsha:Central
South University,2014.
[ 0] 洪 亮,李夕兵,马春德,等. 岩石动态强度及其应变率灵敏性的尺寸效应研究[J]. 岩石学与工程学报,
2008,27(3):526-533.
HONG Liang,LI Xibing,MA Chunde,et al. Study on size effect of rock dynamic strength and strain rate sensitivity[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(3):526-533.
[ 1] LI X B,Lok T S,Zhao J. Dynamic characteristics of granite subjected to intermediate loading rate[J]. Rock
Mechanics and Rock engineering,2005,38(1):21-39.
[ 2] 宫凤强. 动静组合加载下岩石力学特性和动态强度准
则的试验研究 [D]. 长沙:中南大学,2010.
GONG Fengqiang. Experimental study of rock mechanical
properties under coupled static-dynamic loads and dynamic strength criterion [D]. Changsha:Central South University,2010.
[ 3] 刘军忠,许金余,吕晓聪,等. 冲击压缩荷载下角闪岩的动态力学性能试验研究[J]. 岩石学与工程学报,2009,28(10):2113-2120.
LIU Junzhong,XU Jinyu1,LU Xiaocong,et al. Experimental study on dynamic mechanic properties of amphibolites under impact compressive loading[J]. Chinese Journal of Rock Mechanics and Engineering,2009,28(10):2113-2120.
[ 4] 李娜娜,李建春,李海波,等. 节理接触面对应力波传播影响的SHPB 试验研究[J]. 岩石学与工程学报,2015,34(10):1994-2000.
LI Nana,LI Jianchun,LI Haibo,et al. SHPB experiment on influence of contact area of joints on propagation of stress wave [J]. Chinese Journal of Rock Mechanics and Engineering,2015,34(10):1994-2000.
[ 5] 杨仁树,王茂源,杨 阳,等. 充填材料对节理岩石动力学性能影响的模拟试验[J]. 振动与冲击,2016,35(12):125-131.
YANG Renshu,WANG Maoyuan,YANG Yang,et al. Simulation material experiment on the dynamic mechanical properties of jointed rock affected by joint-filling material[J]. Journal of Vibration and Shock,2016,35(12):125-131.
[ 6] 杨 阳,杨仁树,王建国. 节理厚度对岩石动力特性影响的模拟试验[J]. 中国矿业大学学报,2016,45(2):211-216+309.
YANG Yang,YANG Renshu,WANG Jianguo. Simulation on Material experiment on dynamic mechanical properties of jointed rock affected by joint thickness[J]. Journal of China University of Ming & Technology,2016,45(2):211-216+309.
[ 7] 朱晶晶,李夕兵,宫凤强,等. 冲击荷载作用下砂岩的动力学特性及损伤规律[J]. 中南大学学报(自然科学版),2012,43(7):2701-2707.
ZHU Jingjing,LI Xibing,GONG Fengqiang,et al. Experimental test and damagecharacteristics of sandstone under uniaxial impact compressive loads[J]. Journal of
Central South University (Science and Technology),2012,43(7):2701-2707.
[ 8] 姜 峰,李子沐,王宁昌,等. 高应变率条件下山西黑花岗岩的动态力学性能研究[J]. 振动与冲击,2016,35(8):177-182.
JANG Feng,LI Zimu,WANG Ningchang,et al. Research on dynamic characteristics of Shanxi black granite under high strain rates[J]. Journal of Vibration and Shock,2016,35(8):177-182.
[ 9] 李晓锋,李海波,刘 凯,等. 冲击荷载作用下岩石动态力学特性及破裂特征研究[J]. 岩石力学与工程学报,2017,36(10):2393-2405.
LI Xiaofeng, LI Haibo, LIU Kai,et al. Dynamic prop- erties and fracture characteristics of rocks subject to impact loading[J]. Chinese Journal of Rock Mechanics and Engineering,2017,36(10):2393-2405.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}