N型组合节理类岩体单轴压缩破坏试验

doi:10.11872/j.issn.1005-2518.2019.04.548

Abstract

Abstract:

The rock mass contains a large number of complex fracture forms，which have a great impact on the strength and stability of the rock mass，making the rock mass show obvious anisotropy，and thus affecting the safety and stability of civil engineering structures.The common crack forms in rock mass are parallel，cross and intermittent and complex form of these three crack combination forms，and so on.While previous researchers’ study of fractured rock mass were more focused on the common fracture forms such as parallel，intersection and discontinuity.But in practical engineering，the rock mass cracks are mostly complex cracks formed by different combination of fracture forms，such as parallel and intersection joints forming N-shaped joints，and the stress and failure characteristics of N-type joints are more complex than that of single fracture form，and have a greater influence on strength and deformation of rock mass.Aiming at the stability problem of surrounding rock in underground engineering such as tunnels and roadways， the stability of rock mass with N-shaped fractures combined with parallel and cross fractures were studied，taking the N-type joints formed by the combination of 45 degree inclined main joints and two parallel joints as the research object，and the multi-repeated failure modes of tension-shear and compression-shear of rock mass under the combination of parallel and cross-fissures were studied.The influence of different primary and secondary joint angles on rock mass strength and failure mode was analyzed，which provided theoretical support for the design，construction and safety evaluation of underground geotechnical engineering.Uniaxial static load test and ultrasonic test were carried out on the cube specimen of cement mortar with side length of 150 mm，strength of 10 MPa and prefabricated with N-type joint，to obtain their stress strain，failure forms and ultrasonic data.Combined with fracture mechanics theory，it is concluded that the strength and deformation characteristics，the ultrasonic wave velocity attenuation law and failure mode （Ⅰ，Ⅱ crack type crack and extend the features） of N type joint rock mass.The results show that firstly the crack types of N-type composite jointed rock mass have wing crack and secondary inclined crack in sequence，and their propagation paths tend to be in the direction of main stress eventually，which is different from the crack development law with single jointed rock mass.There is a nonlinear relationship between stress intensity factor at the tip of the main joint and the load P and fracture angle θ ₀.When θ ₀ is small and P is close to the peak strength，the specimens mainly propagate in mode Ⅱ crack shape，while mode Ⅰ crack morphology is more obvious when θ ₀ is larger.Secondary the average ultrasonic wave value of the specimens with joint angles ranges from 2.463~2.699 km/s，which is quite different from the ultrasonic wave velocity of the complete specimens （2.725 km/s），indicating that the existence of joints accelerates the internal damage of the specimens.When the inclination angle of the main joint is constant，the angle between the main and secondary joints and the number of joints has some influence on the physical properties of the specimen.The attenuation rate of each group of joint specimens is from 0.9% to 9.6%, the velocity attenuation of joint specimens with angle of 15 and 90 is the fastest，while that of joint specimens with angle of 60 is the slowest.Thirdly the constitutive relationship，peak strength and failure characteristics of composite jointed rock-like mass all show nonlinear characteristics.The distribution law of peak strength basically obeys M-type distribution，which is different from U-type distribution with single joint.Among them，the quasi-brittle failure occurs at the angles of 15，30，45，75，90 degrees and the complete specimen，while the brittle failure occurs at other angles，this may be caused by discrete of the specimens.

Key words: rock mechanics, similar rock materials, combined joint, uniaxial compression, stress intensity factor, ultrasonic test, failure characteristics

CLC Number:

TU45

Bing SUN,Yu LUO,Jiehui XIE,Sheng ZENG. Failure Test of N-type Combination Jointed Rock Mass Under Uniaxial Compression[J].Gold Science and Technology, 2019, 27(4): 548-556.

Figures/Tables 6

Fig.1

Table 1

Fig.2

Fig.3

Fig.4

Fig. 5

References 23

1	郑颖人，王永甫，王成，等 .节理岩体隧道的稳定分析与破坏规律探讨——隧道稳定性分析讲座之一［J］. 地下空间与工程学报，2011，7（4）：649-656.
	Zheng Yingren ， Wang Yongfu ， Wang Cheng ，et al . Stability analysis and exploration of failure law of jointed rock tunnel ——Seminor on tunnel stability analysis［J］. Chinese Journal of Underground Space and Engineering，2011，7（4）：649-656.
2	杜登计，牛少卿 . 岩体结构类型与巷道围岩稳定程度的相关性研究［J］. 煤炭工程，2014，46（4）：87-89，92.
	Du Dengji ， Niu Shaoqing .Study on correlation between rock structure type and stability of surrounding rock along mine roadway［J］.Coal Engineering，2014，46（4）：87-89，92.
3	王卫华，李坤，严哲，等 .节理压缩闭合试验前后表面形态特征变化分析［J］. 黄金科学技术，2016，24（6）：84-89.
	Wang Weihua ， Li Kun ， Yan Zhe ，et al . Analysis on changes of surface morphological characteristics of joint under compression closed testing［J］.Gold Science and Technology，2016，24（6）：84-89.
4	苏海健，靖洪文，赵洪辉，等 . 平行裂隙群岩体强度与破裂特征的试验研究［J］. 工程力学，2015，32（5）：192-197，207.
	Su Haijian ， Jing Hongwen ， Zhao Honghui ，et al .Strength and Fracture characteristic of rock mass containing parallel fissures［J］.Engineering Mechanics，2015，32（5）：192-197，207.
5	张波，李术才，杨学英，等 .含交叉裂隙节理岩体单轴压缩破坏机制研究［J］. 岩土力学，2014，35（7）：1863-1870.
	Zhang Bo ， Li Shucai ， Yang Xueying ，et al . Uniaxial compression failure mechanism of jointed rock mass with cross-cracks［J］. Rock and Soil Mechanics，2014，35（7）：1863-1870.
6	王笑然，王恩元，刘晓斐，等 .含雁行裂纹砂岩静态加载速率效应实验研究［J］.煤炭学报，2017，42（10）：2582-2591.
	Wang Xiaoran ， Wang Enyuan ， Liu Xiaofei ，et al .Experimental study on the static loading rate effects of sandstone specimen containing pre-existing echelon cracks［J］. Journal of China Coal Society，2017，42（10）：2582-2591.
7	Brown E T . Strength of models of rock with intermittent joints［J］.Journal of the Soil Mechanics and Foundations Division，1970，96（6）：1935-1949.
8	Goldstein M ， Goosev B ， Pyrogovsky N ，et al . Investigation of mechanical properties of cracked rock［C］//Proceedings of the 1st ISRM Congress，Lisbon.Salzburg:International Society for Rock Mechanics and Rock Engineering，1966：521-524.
9	程龙，杨圣奇，刘相如 . 含缺陷砂岩裂纹扩展特征试验与模拟研究［J］. 采矿与安全工程学报，2012，29（5）：719-724.
	Cheng Long ， Yang Shengqi ， Liu Xiangru .Experimental and numerial investigation on crack expansion of sandstone containing flaws ［J］. Journal of Mining and Safety Engineering，2012，29（5）：719-724.
10	Wong R H C ， Chau K T ， Tang C A ，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.
11	Liu H Y ， Su T M . A dynamic damage constitutive model for a rock mass with non-persistent joints under uniaxial compression ［J］. Mechanics Research Communications，2016，77：12-20.
12	Chen L ， Liu J . Numerical analysis on the crack pro- pagation and failure characteristics of rocks with double fissures under the uniaxial compression［J］.Petroleum，2015，1（4）：373-381.
13	刘刚，姜清辉，熊峰，等 . 多节理岩体裂纹扩展及变形破坏试验研究［J］. 岩土力学，2016，37（增1）：151-158.
	Liu Gang ， Jiang Qinghui ， Xiong Feng ，et al . Experimental study of crack propagation and deformation failure of multiple- jointed rock mass［J］. Rock and Soil Mechanics，2016，37（Supp.1）：151-158.
14	蒲成志，曹平，赵延林，等 . 单轴压缩下多裂隙类岩石材料强度试验与数值分析［J］. 岩土力学，2010，31（11）：3661-3666.
	Pu Chengzhi ， Cao Ping ， Zhao Yanlin ，et al .Numerical analysis and strength experiment of rock-like materials with multi- fissures under uniaxial compression［J］. Rock and Soil Mechanics，2010，31（11）：3661-3666.
15	张平，李宁，贺若兰，等 . 动载下3条断续裂隙岩样的裂缝贯通机制［J］. 岩土力学，2006，27（9）：1457-1464.
	Zhang Ping ， Li Ning ， He Ruolan ，et al .Fracture coalescence mechanism of three-intermittent-flaws rock specimen under dynamic loading［J］. Rock and Soil Mechanics，2006，27（9）：1457-1464.
16	刘红岩，王新生，张力民，等 . 非贯通节理岩体单轴压缩动态损伤本构模型［J］. 岩土工程学报，2016，38（3）：426-436.
	Liu Hongyan ， Wang Xinsheng ， Zhang Limin ，et al . A dynamic damage constitutive model for rock mass with non-persistent joints under uniaxial compression［J］.Chinese Journal of Geotechnical Engineering，2016，38（3）：426-436.
17	宋义敏，杨小彬，杨晟萱，等 . 冲击载荷下岩石裂纹动态断裂参数研究［J］. 采矿与安全工程学报，2015，32（5）：834-839.
	Song Yimin ， Yang Xiaobin ， Yang Shengxuan ，et al .The research of rock dynamic fracture parameter under the action of impact load［J］. Journal of Mining and Safety Engineering，2015，32（5）：834-839.
18	刘梦和，王向东 . 混凝土复合型裂缝的断裂能及其判据研究［J］. 防灾减灾工程学报，2013，33（2）：174-178.
	Liu Menghe ， Wang Xiangdong .Research on fracture energy of mixed mode crack in concrete and its criteria［J］. Journal of Disaster Prevention and Mitigation Engineering，2013，33（2）：174-178.
19	孙旭曙，李建林，王乐华，等 .节理岩体超声测试及单轴压缩试验研究［J］. 岩土力学，2014，35（12）：3473- 3478，3488.
	Sun Xushu ， Li Jianlin ， Wang Lehua ，et al .Study of ultrasonic test and uniaxial compression test of jointed rock masses［J］.Rock and Soil Mechanics，2014，35（12）：3473-3478，3488.
20	徐华荣，朱冠美，盛沛英，等 . 混凝土Ⅰ、Ⅱ复合型裂纹的断裂规律［J］. 长江科学院院报，1987（2）：13-20.
	Xu Huarong ， Zhu Guanmei ， Sheng Peiying ，et al . The regular patterns of combined mode （modeⅠand Ⅱ） fracture in concrete［J］.Journal of Yangtze River Scientific Research Institute，1987（2）：13-20.
21	王元汉，徐钺，谭国焕，等 . 岩体断裂的破坏机理与计算模拟［J］. 岩石力学与工程学报，2000，19（4）：449-452.
	Wang Yuanhan ， Xu Yue ， Tan Guohuan ，et al . Fracture mechanism and calculation of rock fracture［J］.Chinese Journal of Rock Mechanics and Engineering，2000，19（4）：449-452.
22	美国混凝土学会 . 美国房屋建筑混凝土结构规范 (ACI318-05)及条文说明(ACI318R-05)[M]. 重庆：重庆大学出版社, 2007.
	American Society of Concrete . American Code for Concrete Structures in Building(ACI318-05) and Directions (ACI318R-05)［M］.Chongqing:Chongqing University Press,2007.
23	周群力，刘格非 . 脆性材料的压剪断裂［J］. 水利学报，1982（7）：63-69.
	Zhou Qunli ， Liu Gefei .Compression shear fracture of brittle material［J］.Journal of Hydraulic Engineering，1982（7）：63-69.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

Comments

Recommended 10

[1]	HU Qin-Xia, LI Jian-Zhong, YU Guang-Meng, XIE Yan-Fang, ZHANG Ku-Xiao. Discussion on Gold Ore Point of Bailongjiang Metallogenic Belt[J]. J4, 2010, 18(3): 51 -53 .
[2]	SONG He-Min, FENG Chi-Li, DING Xian-Hua. Geological-Geochemical Charicteristics and Prospecting Direction of Jiaojiekou Mining Area, North Part of Taihang Mountain[J]. J4, 2010, 18(3): 54 -58 .
[3]	YANG Meng-Rong, MAO Chang-Xian. Uncertainty Evaluation of Arsenic and Antimony in Chemical Prospecting Sa-mple by Atomic Fluorescence Spectrometry[J]. J4, 2010, 18(3): 68 -71 .
[4]	LI Bin, JU Hai-Xiang, YANG Mu, DU Gao-Feng, HUI Ji-Kang, WANG Tian-Guo. [J]. J4, 2010, 18(4): 17 -21 .
[5]	YAN Jie, QIN Ze-Li, XIE Wen-Bing, CA Bang-Yong. [J]. J4, 2010, 18(4): 22 -26 .
[6]	JIANG Qi, WANG Rong-Chao. [J]. J4, 2010, 18(4): 37 -40 .
[7]	LI Hong-Jie, CU Jing-Ji, MA Shu-Jiang. [J]. J4, 2010, 18(4): 41 -46 .
[8]	YUAN Dong-Cheng, XU Xiao-Feng. [J]. J4, 2010, 18(4): 47 -49 .
[9]	LIU Jin-Feng, LIU Mo-Jiang, LI Ding-Kun, LI Tian-Dong. [J]. J4, 2010, 18(4): 80 -81 .
[10]	LIU Yuan-Hua, YANG Gui-Cai, ZHANG Lun, JI Jin-Zhong, LI Wen-Liang. Petrology and Geochemistry of Granites in Yangshan Ultra-large Gold Deposit,West Qinling[J]. J4, 2010, 18(6): 1 -7 .

节理夹角/（°）	超声波波速最大值/（km·s^-1）	超声波波速最小值/（km·s^-1）	超声波波速平均值/（km·s^-1）	标准差	衰减率/%
完整试件	2.863	2.027	2.725	209
0	2.778	1.832	2.563	300	5.9
15	2.660	1.802	2.482	243	8.9
30	2.717	1.965	2.514	253	7.7
45	2.757	2.001	2.605	194	4.4
60	2.799	2.119	2.699	183	0.9
75	2.679	2.083	2.518	180	7.5
90	2.660	1.658	2.463	295	9.6

Failure Test of N-type Combination Jointed Rock Mass Under Uniaxial Compression

RichHTML

PDF (PC)

Abstract

Cite this article

share this article

Figures/Tables 6

References 23

Related Articles 8

Metrics

Comments

Recommended 10

[1]	Chundi FENG,Rendong HUANG. Plastic Strain Analysis of Mineral Particles in Red Sandstone [J]. Gold Science and Technology, 2019, 27(4): 557-564.
[2]	Shijiao YANG,Zhihui WANG. Numerical Simulation on Stability of Shallow-buried Goaf Group with Overlying Highway [J]. Gold Science and Technology, 2019, 27(4): 505-512.
[3]	Haoran CHEN,Ping CAO,Longwei RAN. Experimental Study of Rock-like Material with Zigzag Fracture Under Uniaxial Compression [J]. Gold Science and Technology, 2019, 27(3): 398-405.
[4]	Sheng ZENG,Shaoping WANG,Ni ZHANG. Research Progress of Rock Crack Propagation Under Impact Loading [J]. Gold Science and Technology, 2019, 27(1): 52-62.
[5]	LIN Ge, GONG Fengqiang. Research on Evaluation Index of Red Sandstone Instability Under Different Stress [J]. Gold Science and Technology, 2018, 26(2): 195-202.
[6]	WANG Jin，GONG Fengqiang. Study On Rate Effect of Uniaxial Compression Test for Red Sandstone [J]. Gold Science and Technology, 2018, 26(1): 56-63.
[7]	XIAO Weijing，CHEN Chen，LI Yongxin，WANG Xiaojun，CAO Shirong，HAN Jianwen. Creep Experiment and Model of Deep Limestone Under Step Loading [J]. Gold Science and Technology, 2017, 25(2): 76-82.
[8]	GUO Guangjun，LIU Mingjun，XU Yongbin，CHENG Wei，YE Yanling，ZHENG Xiaoli，GAO Haifen. Stability Classification of Engineering Rock Body in Jiaojia Gold Mine，Shandong Province [J]. J4, 2012, 20(4): 71-75.