不同预静载硬岩在动力扰动下断裂特性的试验研究

doi:10.13722/j.cnki.jrme.2016.1439

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摘要为了研究不同预静载水平下硬岩受不同扰动频率载荷的断裂特性变化规律，采用红砂岩制作中心直裂纹半圆盘三点弯曲试样(Semi-Circular Bend，SCB)，利用MTS Landmark电液伺服试验机，开展“不同预静载+动力扰动”下砂岩的断裂韧度测试试验。以岩石静载断裂载荷为基础，选取4个预静载水平(60%，70%，80%和90%的静载断裂载荷)作为初始静载状态，之后分别施加扰动载荷直至试样断裂。扰动加载方式采用正弦波载荷，加载波幅值依次为静载断裂载荷的40%，30%，20%和10%，设置扰动频率分别为1，10，20，30，40和50 Hz。研究结果表明，不同预静载水平下岩石的断裂韧度值较常规加载下都有不同幅度的减小，并且随着扰动频率的增加，岩石断裂韧度呈线性减小的趋势。但不同预静载水平之间的减韧效应存在差异性，预静载水平越高，减韧幅度越大。与常规加载条件下相比，预静载水平下的断裂位移整体具有减小的趋势。岩石扰动断裂点的分布区段具有明显的集中性，当预静载水平低于90%时，断裂点位于预应力水平之上的加载段，而当预静载水平为90%时，断裂点多数位于预应力水平之上的卸载段，并且基本上没有断裂破坏发生在预应力水平之下。断裂疲劳寿命随扰动频率的增加出现先增大后减小再增大的趋势，整体呈增加趋势。断裂破坏时间跟预静载水平、扰动频率之间的相关性不明显。综合考虑认为，扰动频率为10 Hz时达到相对最优的致裂效果。

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	宫凤强1
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	罗勇1

关键词 ：岩石力学, 深部岩石断裂, 动静组合加载, 中心直裂纹半圆盘, 低频扰动, 减韧效应

Abstract：In order to investigate the variation of fractures of pre-static loaded hard rock under the different dynamic disturbance，the fracture toughness tests of sandstone were carried out on three point bending specimen with a straight crack in the center of the red sandstone(SCB) using the electro hydraulic servo testing machine Landmark MTS. Four pre-static load levels(60%，70%，80% and 90% of conventional static fracture load) were selected. The dynamic disturbance tests were conducted by using the sine wave loading. The amplitude of loading were 40%，30%，20% and 10% of the static fracture load and the loading frequency were 1，10，20，30，40 and 50 Hz respectively. Compared with in the conventional static fracture tests，the fracture toughness of rock under different pre-static loads decreased and it decreased linearly with the increase of the disturbance frequency. However，the toughness decreasing effects under the different static pre-loadings are different. The higher the pre-static level，the greater effect of the toughness decreasing. Compared with the conventional fracture displacement，the fracture displacement under pre-static loadings decreased as a whole. The concentrated distribution of disturbance induced fracturing point was found. The fracturing point occurred in the loading stage above the pre-static level when the pre-static load level is less than 90%，while the fracture point occurred in the unloading stage above the pre-static load level when the level of pre-static load is 90%. With the increase of disturbance frequency，the fatigue life span increased firstly，then decreased and finally increased again with an overall trend of increasing. No obvious correlations between the time of fracturing failure，the pre-static load level and the disturbance frequency were found. The cracking effect is about optimal when the disturbance frequency is 10 Hz.

Key words： rock mechanics deep rock fracture coupled static and dynamic loading semi-circular bend(SCB) low frequency disturbance toughness decreasing effect

引用本文:

宫凤强1，2，3，张乐1，李夕兵1，3，罗勇1. 不同预静载硬岩在动力扰动下断裂特性的试验研究[J]. 岩石力学与工程学报, 2017, 36(8): 1841-1854.
GONG Fengqiang1，2，3，ZHANG Le1，LI Xibing1，3，LUO Yong1. Experimental study on fracture behaviors of hard rock under dynamic disturbance with different pre-static loads. , 2017, 36(8): 1841-1854.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2016.1439 或 http://www.rockmech.org/CN/Y2017/V36/I8/1841

[4]	蔡美峰，冀东，郭奇峰. 基于地应力现场实测与开采扰动能量积聚理论的岩爆预测研究[J]. 岩石力学与工程学报，2013，32(10)：1 973-1 980.(CAI Meifeng，JI Dong，GUO Qifeng. Study of rockburst prediction based on in-situ stress measurement and theory of energy accumulation caused by mining disturbance[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(10)：1 973- 1 980.(in Chinese))
[9]	宫凤强，李夕兵，刘希灵. 三维动静组合加载下岩石力学特性试验初探[J]. 岩石力学与工程学报，2011，30(6)：1 179-1 190. (GONG Fengqiang，LI Xibing，LIU Xiling. Preliminary experimental study of characteristics of rock subjected to 3D coupled static and dynamic loads[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(6)：1 179-1 190.(in Chinese))
[14]	赵伏军，谢世勇，潘建忠，等. 动静组合载荷作用下岩石破碎数值模拟及试验研究[J]. 岩土工程学报，2011，33(8)：1 290-1 294. (ZHAO Fujun，XIE Shiyong，PAN Jianzhong，et al. Numerical simulation and experimental investigation on rock fragmentation under combined dynamic and static loading[J]. Chinese Journal of Geotechnical Engineering，2011，33(8)：1 290-1 294.(in Chinese)) " target="_blank">
[17]	宫凤强，陆道辉，李夕兵，等. 动力扰动下预静载硬岩断裂的增韧和减韧效应[J]. 岩石力学与工程学报，2014，33(9)：1 905-1 915. (GONG Fengqiang，LU Daohui，LI Xibing，et al. Toughness increasing or decreasing effect of hard rock fracture with pre-static loading under dynamic disturbance[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(9)：1 905-1 915.(in Chinese))
[3]	李夕兵，姚金蕊，宫凤强. 硬岩金属矿山深部开采中的动力学问题[J]. 中国有色金属学报，2011，21(10)：2 552-2 562.(LI Xibing，YAO Jinrui，GONG Fengqiang. Dynamic problems in deep exploitation of hard rock metal mines[J]. The Chinese Journal of Nonferrous Metals，2011，21(10)：2 552-2 562.(in Chinese))
[8]	宫凤强，李夕兵，刘希灵，等. 一维动静组合加载下砂岩动力学特性的试验研究[J]. 岩石力学与工程学报，2010，29(10)：2 076- 2 085.(GONG Fengqiang，LI Xibing，LIU Xiling，et al. Experimental study of dynamic characteristics of sandstone under one-dimensional coupled static and dynamic loads[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(10)：2 076-2 085.(in Chinese))
[13]	ZHU W C，LI Z H，ZHU L，et al. Numerical simulation on rock burst of underground opening triggered by dynamic disturbance[J]. Tunneling and Underground Space Technology，2010，25(5)：587-599.
[16]	WONG R H C，CHAU K T，TANG C，et al. Analysis of crack coalescence in rock-like materials containing three flaws part I：experimental approach[J]. International Journal of Rock Mechanics and Mining Sciences，2001，38(7)：909-924. " target="_blank">
[18]	CHONG K P，KURUPPU M D. New specimen for fracture toughness determination for rock and other materials[J]. International Journal of Fracture，1984，26(2)：59-62. " target="_blank">
[19]	LIM I L，JOHNSTON I W，CHOI S K. Stress intensity factors for semi-circular specimens under three-point bending[J]. Engineering Fracture Mechanics，1993，44(3)：363-382. " target="_blank">
[25]	黄春水，高丹盈，朱海堂. 加载频率对纤维沥青混凝土疲劳性能的影响[J]. 华北水利水电学院学报，2012，33(6)：106-111. (HUANG Chunshui，GAO Danying，ZHU Haitang. Influence of loading frequency on fatigue performance of fiber reinforced asphalt concrete[J]. Journal of North China Institute of Water Conservancy and Hydroelectric Power，2012，33(6)：106-111.(in Chinese))
[2]	“深部岩体力学与开采理论”获立项[EB/OL]. http：//news. sciencenet.cn/htmlnews/2016/8/354248.shtm. " target="_blank">
[15]	张晓春，卢爱红，王军强. 动力扰动导致巷道围岩层裂结构及冲击矿压的数值模拟[J]. 岩石力学与工程学报，2006，25(增1)：3 110-3 114.(ZHANG Xiaochun，LU Aihong，WANG Junqiang. Numerical simulation of layer-crack structure of surrounding rock and rock burst in roadway under dynamic disturbance[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(Supp.1)：3 110-3 114.(in Chinese))
[5]	曹平，潘长良，冯涛，等. 深井硬岩岩爆实录与特征分析[C]// 中国岩石力学与工程学会主编. 第六次全国岩石力学与工程学会学术大会论文集. 北京：中国科学技术出版社，2000：735-737.(CAO Ping，PAN Changliang，FENG Tao，et al. Memoir and features analysis of rockburst in hard rockmass[C]// Chinese Society for Rock Mechanics and Engineering ed. Proceedings of the 6th National Society for Rock Mechanics and Engineering Conference. Beijing：China Science and Technology Press，2000：735-737.(in Chinese)) " target="_blank">
[6]	周辉，卢景景，徐荣超，等. 深埋硬岩隧洞围岩板裂化破坏研究的关键问题及研究进展[J]. 岩土力学，2015，36(10)：2 737-2 749. (ZHOU Hui，LU Jingjing，XU Rongchao，et al. Critical problems of study of slabbing failure of surrounding rock in deep hard rock tunnel and research progress[J]. Rock and Soil Mechanics，2015，36(10)：2 737-2 749.(in Chinese))
[23]	张世殊，刘恩龙，张建海. 砂岩在低频循环荷载作用下的疲劳和损伤特性试验研究[J]. 岩石力学与工程学报，2014，33(增1)：3 212-3 218.(ZHANG Shishu，LIU Enlong，ZHANG Jianhai. Experimental study of fatigue damage properties of sandstone samples under cyclic loading with low frequencies[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.1)：3 212-3 218.(in Chinese))
[24]	赵凯，乔春生，罗富荣，等. 不同频率循环荷载下石灰岩疲劳特性试验研究[J]. 岩石力学与工程学报，2014，33(增2)：3 466- 3 475.(ZHAO Kai，QIAO Qiaosheng，LUO Furong，et al. Experimental study of fatigue characteristics of limestone samples subjected to uniaxial cyclic loading with different frequencies[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.2)：3 466-3 475.(in Chinese))
[7]	李夕兵，姚金蕊，杜坤. 高地应力硬岩矿山诱导致裂非爆连续开采初探——以开阳磷矿为例[J]. 岩石力学与工程学报，2013，32(6)：1 101-1 111.(LI Xibing，YAO Jinrui，DU Kun. Preliminary study for induced fracture and non-explosive continuous mining in high-geostress hard rock mine—a case study of Kaiyang phosphate mine[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(6)：1 101-1 111.(in Chinese)) " target="_blank">
[1]	谢和平，高峰，鞠杨. 深部岩体力学研究与探索[J]. 岩石力学与工程学报，2015，34(11)：2 161-2 178.(XIE Heping，GAO Feng，JU Yang. Research and development of rock mechanics in deep ground engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(11)：2 161-2 178.(in Chinese))
[10]	左宇军，马春德，朱万成，等. 动力扰动下深部开挖洞室围岩分层断裂破坏机制模型试验研究[J]. 岩土力学，2011，32(10)：2 929- 2 936.(ZUO Yujun，MA Chunde，ZHU Wancheng，et al. Model test study of mechanism of layered fracture within surrounding rock of tunnels in deep stratum tunneling under dynamic disturbance[J]. Rock and Soil Mechanics，2011，32(10)：2 929-2 936.(in Chinese)) " target="_blank">
[11]	唐礼忠，程露萍，王春，等. 高静载条件下受频繁动力扰动时蛇纹岩动力学特性研究[J]. 岩土力学，2016，37(10)：1-10.(TANG Lizhong，CHENG Luping，WANG Chun，et al. Dynamic characteristics of serpentine under the condition of high static load and frequent dynamic disturbance[J]. Rock and Soil Mechanics，2016，37(10)：1-10.(in Chinese))
[12]	苏国韶，胡李华，冯夏庭，等. 低频周期扰动荷载与静载联合作用下岩爆过程的真三轴试验研究[J]. 岩石力学与工程学报，2016，35(7)：1 309-1 321.(SU Guoshao，HU Lihua，FENG Xiating，et al. True triaxial experimental study of rock burst process under low frequency cyclic disturbance load combined with static load[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(7)：1 309-1 321.(in Chinese))
[20]	DAI F，XIA K，ZHENG H，et al. Determination of dynamic rock Mode-I fracture parameters using cracked chevron notched semi-circular bend specimen[J]. Engineering Fracture Mechanics，2011，78(15)：2 633-2 644. " target="_blank">
[21]	ZHOU Y X，XIA K，LI X B，et al. Suggested methods for determining the dynamic strength parameters and mode-I fracture toughness of rock materials[J]. International Journal of Rock Mechanics and Mining Sciences，2012，49：105-112. " target="_blank">
[22]	葛修润，蒋宇，卢允德，等. 周期荷载作用下岩石疲劳变形特性试验研究[J]. 岩石力学与工程学报，2003，22(10)：1 581-1 585. (GE Xiurun，JIANG Yu，LU Yunde，et al. Testing study on fatigue deformation law of rock under cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(10)：1 581-1 585.(in Chinese))