|
|
|
| Internal influence mechanism of blockiness index |
| CHEN Qingfa1，YANG Zichao1，YIN Tingchang1，WANG Shaoping2 |
| (1. College of Resources，Materials and Environment，Guangxi University，Nanning，Guangxi 530004，China；2. College of Civil Engineering，Guangxi University，Nanning，Guangxi 530004，China) |
|
|
|
|
Abstract As a new index to evaluate the integrity of rock mass，blockiness can reflect the degree of rock fragmentation from a three-dimensional perspective. In order to accurately grasp the sensitivity of the influence parameters of the blockiness index，a series of three-dimensional fracture network models under the influence of three main influence parameters，namely fracture spacing，fracture persistence and fracture occurrence，are constructed by using the joints and interfaces network inverse modeling technology，and blockiness value of each model is calculated；the influence parameters and blockiness index are calculated and analyzed by using the grey correlation analysis method. The results show that the index of blockiness has negative correlation with fracture spacing，positive correlation with fracture persistence，and no obvious relationship with fracture occurrence；the grey correlation degree of fracture spacing，fracture persistence and fracture occurrence with the index of blockiness is 0.779 9，0.622 5 and 0.34，respectively，and the influence of fracture spacing on the index of blockiness is the largest，followed by fracture persistence，the influence degree of fracture occurrence is the least. The research results lay a theoretical foundation for the complete construction of the evaluation method system of the degree of fragmentation of fractured rock mass.
|
|
|
|
|
|
| [1] 谷德振. 岩体工程地质力学基础[M]. 北京：科学出版社，1979：253–259.(GU Dezhen. Foundation of rock engineering geomechanics[M]. Beijing：Science Press，1979：253–259.(in Chinese))
[2] 孙广忠. 岩体结构力学[M]. 北京：科学出版社，1988：1–14.(SUN Guangzhong. Structural mechanics of rock mass[M]. Beijing：Science Press，1988：1–14.(in Chinese))
[3] 吴 琼，唐辉明，王亮清，等. 裂隙岩体力学参数及稳定性研究[M]. 武汉：中国地质大学出版社，2016：74–96.(WU Qiong，TANG Huiming，WANG Liangqing，et al. Study on mechanical parameters and stability of fractured rock mass[M]. Wuhan：China University of Geosciences Press，2016：74–96.(in Chinese))
[4] NORCONSULT A S，VESTFJORDGATEN S N. Measurements of and correlations between block size and rock quality designation (RQD)[J]. Tunnelling and Underground Space Technology，2005，20：362–377.
[5] PELLS P J，BIENIAWSKI Z T，HENCHER S R，et al. Rock quality designation(RQD)：time to rest in peace[J]. Geotechnical Journal，2017，54(6)：1–34.
[6] 陈剑平，范建华，刘 迪. RQD应用与研究的回顾与展望[J]. 岩土力学，2005，26(增)：249–252.(CHEN Jianping，FAN Jianhua，LIU Di. A review and prospect on the application and research of RQD[J]. Rock and Soil Mechanics，2005，26(Supp.)：249–252.(in Chinese))
[7] 倪卫达，单治钢，刘 晓. 基于三维节理网络模拟的坝基岩体结构分类研究[J]. 岩土力学，2018，39(1)：287–296.(NI Weida，SHAN Zhigang，LIU Xiao. Classification of rock mass structure of dam foundation based on 3D joint network simulation[J]. Rock and Soil Mechanics，2018，39(1)：287–296.(in Chinese))
[8] 胡卸文，钟沛林，任志刚. 岩体块度指数及其工程意义[J]. 水利学报，2002，3(3)：80–83.(HU Xiewen，ZHONG Peilin，REN Zhigang. Rock-mass block index and its engineering practice significance[J]. Journal of Hydraulic Engineering，2002，3(3)：80–83.(in Chinese))
[9] 马超峰，李 晓，成国文，等. 工程岩体完整性评价的实用方法研究[J]. 岩土力学，2010，31(11)：3 579–3 584.(MA Chaofeng，LI Xiao，CHENG Guowen，et al. Study of practical approach to assess integrality of engineering rock mass[J]. Rock and Soil Mechanics，2010，31(11)：3 579–3 584.(in Chinese))
[10] 李攀峰，杨建宏，聂德新. 岩体体积节理数的修正研究[J]. 长江科学院院报，2009，26(12)：79–83.(LI Panfeng，YANG Jianhong，NIE Dexin. Study of modification of volumetric joint count[J]. Journal of Yangtze River Scientific Reasearch Institute，2009，26(12)：79–83.(in Chinese))
[11] 夏 露，刘晓菲，于青春. 基于块体化程度确定裂隙岩体表征单元体[J]. 岩土力学，2010，31(12)：3 993–4 005.(XIA Lu，LIU Xiaofei，YU Qingchun. Determining representative elementary volume of fractured rock mass based on blockiness analysis[J]. Rock and Soil Mechanics，2010，31(12)：3 993–4 005.(in Chinese))
[12] 于青春，陈德基，薛果夫，等. 裂隙岩体一般块体理论初步[J]. 水文地质工程地质，2015，21(6)：42–48.(YU Qingchun，CHEN Deji，XUE Guofu，et al. Preliminary study on general block method of fractured rock mass[J]. Hydrogeology and Engineering Geology，2015，21(6)：42–48.(in Chinese))
[13] 张莉丽，于青春. 一般块体方法理论解验证[J]. 水文地质工程地质，2010，37(6)：55–60.(ZHANG Lili，YU Qingchun. Theoretical validation on general block method[J]. Hydrogeology and Engineering Geology，2010，37(6)：55–60.(in Chinese))
[14] XIA L，YU Q C. Numerical investigations of blockiness of fractured rocks based on fracture spacing and disc diameter[J]. Geomech.，2020，20(3)：1–10.
[15] CHEN Q F，YIN T C，NIU W J，et al. Study of the geometrical size effect of a fractured rock mass based on the modified blockiness evaluation method[J]. Arabian Journal of Geosciences，2018：11(11)：286–291.
[16] CHEN Q F，YIN T C，JIA H Y. Selection of optimal threshold of generalised rock quality designation based on modified blockiness index[J]. Advances in Civil Engineering，2019，(1)：1–11.
[17] 夏 露. 三峡工程地下站厂房岩石块体研究[硕士学位论文][D]. 北京：中国地质大学，2011.(XIA Lu. Rock blocks in the rock around the underground powerhouse of three-gorges project[M. S. Thesis][D]. Beijing：China University of Geosciences，2011.(in Chinese))
[18] 于青春，薛果夫，陈德基. 裂隙岩体一般块体理论[M]. 北京：中国水利水电出版社，2007：65–79.(YU Qingchun，XUE Guofu，CHEN Deji. General block theory of fractured rock mass[M]. Beijing：China WaterPower Press，2007：65–79.(in Chinese))
[19] XIA L，LI M，CHEN Y，et al. Blockiness level of rock mass around underground powerhouse of Three Gorges Project[J]. Tunnelling and Underground Space Technology，2015，48(3)：67–76.
[20] 刘晓非. 裂隙岩体块体化程度研究[硕士学位论文][D]. 武汉：中国地质大学，2010.(LIU Xiaofei. Studies on blockiness of fractured rock mass[M. S. Thesis][D]. Wuhan：China University of Geosciences，2010.(in Chinese))
[21] HAN X D，CHEN J P，WANG Q，et al. A 3D fracture network model for the undisturbed rock mass at the songta dam site based on small samples[J]. Technical Note，2015，4(12)：611–619.
[22] 赵建平，戴东波，张振洋，等. 线性聚能爆破时影响岩体损伤因素的灰色关联分析[J]. 爆破，2018，35(4)：14–19.(ZHAO Jianping，DAI Dongbo，ZHANG Zhenyang，et al. Grey relational analysis of influencing factors of rock mass damage during linear shaped charge blasting[J]. Blasting，2018，35(4):14–19.(in Chinese))
[23] 王 平，王 强，王 俊，等. 黄土场地剪切波速影响因素模糊灰关联分析研究[J]. 岩石力学与工程学报，2014，33(增2)：4 299–4 304.(WANG Ping，WANG Qiang，WANG Jun，et al. Research on loess site′s shear wave velocity influenceing factor based on fuzzy-gray relational analysis[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.2)：4 299–4 304.(in Chinese))
[24] 刘思峰，党耀国，方志耕，等. 灰色系统理论及其应用[M]. 5版. 北京：科学出版社，2010：185–211.(LIU Sifeng，DANG Yaoguo，FANG Zhigeng，et al. Grey system theory and its application[M]. 5th ed. Beijing：Science Press，2010：185–211.(in Chinese))
[25] 王正新，党耀国，沈春光. 三维灰色关联模型及其应用[J]. 统计与决策，2011，8(15)：174–176.(WANG Zhengxin，DANG Yaoguo，SHEN Chunguang. Three dimensional grey correlation model and its application[J]. Statistics and Decision，2011，8(15)：174–176.(in Chinese))
|
|
|
|
2020, Vol. 39 
