Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (S1): 275-280.doi: 10.16285/j.rsm.2018.1524

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Discussion on calculation methods of quality index of slope engineering rock mass in Standard for engineering classification of rock mass

DING Zhen-jie1, 2, ZHENG Jun3, LÜ Qing3, DENG Jian-hui4, TONG Meng-sheng5   

  1. 1. Ninghai Supervision Station of Traffic Construction Engineering Quality and Safety, Ningbo, Zhejiang 315600, China; 2. Ninghai County Communications Group Co., Ltd., Ningbo, Zhejiang 315600, China; 3. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang 310058, China; 4. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China; 5. Ninghai Headquarters for Yong-Lin Highway Engineering Construction, Ningbo, Zhejiang 315600, China
  • Received:2018-08-01 Online:2019-08-01 Published:2019-08-16
  • Supported by:
    This work was supported by the National Key R & D Program of China(2018YFC1505005), the National Natural Science Foundation Projects(41772322, 41772287), Zhejiang Provincial Natural Science Foundation Project(LY18E090002), and the Research Programs of Transportation Department of Zhejiang Province (KH20170421).

PDF (Chinese)

304

Abstract: Rock mass quality rating index is the basis of rock slope stability evaluation. In revised Standard for engineering classification of rock mass, the calculation formula of quality index of slope engineering rock mass(QISERM) is added. In the formula there is a correction coefficient F3, which reflects the relationship between the dip angles of the main discontinuity and the slope. According to the standard, the value of F3 is determined by the difference between the dip angles of the main discontinuities and the slope. The paper discussed the flaw existing in the aforementioned method in determining F3, and gave the modification suggestions by applying the difference between the dip angle of the main discontinuity and the apparent dip angle of the slope in the dip direction of the main discontinuity. In addition, the QISERM of 13 357 examples were calculated using the two methods suggested by the standard and this paper, and then the difference of [BQ] between these two methods was analyzed. It shows that when the correction coefficient of discontinuity type and extension ? is equal to 0.6, the difference is less than 40 and 78.3% of them is less than 5; when ? is equal to 1.0, the difference is less than 60 and 68.7% of them is less than 5. The method proposed in this paper is more complete and more accurate than the new standard method in theory, and it can provide reference for the calculation of QISERM.

Key words: rock mass quality evaluation, standard, rock mass rating, rock mass classification

CLC Number: 

  • TU 452
[1] WU Xin-lin, ZHANG Xiao-ping, LIU Quan-sheng, LI Wei-wei, HUANG Ji-min. Prediction and classification of rock mass boreability in TBM tunnel [J]. Rock and Soil Mechanics, 2020, 41(5): 1721-1729.
[2] ZHOU Cui-ying, KONG Ling-hua, CUI Guang-jun, YU Lei, LIU Zhen, . Molding simulation of soft rock based on natural red bed materials [J]. Rock and Soil Mechanics, 2020, 41(2): 419-427.
[3] LI Zhao-yan, YUAN Xiao-ming, SUN Rui. Variation tendencies and general rules for critical curve of liquefaction evaluation [J]. Rock and Soil Mechanics, 2019, 40(9): 3603-3609.
[4] YU Liang-gui, ZHOU Jian, WEN Xiao-gui, XU Jie, LUO Ling-hui, . Standard exploration of permeability coefficient test for clay by HCA [J]. Rock and Soil Mechanics, 2019, 40(6): 2293-2302.
[5] WANG Qin-ke, MA Jian-lin, HU Zhong-bo, WANG Bin, . Field tests on bearing behaviors of uplift piles in soft rock with shallow overburden [J]. Rock and Soil Mechanics, 2019, 40(4): 1498-1506.
[6] WANG Bu-xue-yan, MENG Qing-shan, WEI Chang-fu, CHEN Min, YAN Ke, ZHANG Po-yu, . Quantitative experimental study of the morphology of coral sand and gravel particles under multiple projection surfaces [J]. Rock and Soil Mechanics, 2019, 40(10): 3871-3878.
[7] NIAN Ting-kai, JIAO Hou-bin, FAN Ning, GUO Xing-sen, JIA Yong-gang，. Experiment on dynamic strain-pore pressure of soft clay in the northern slope of South China Sea [J]. , 2018, 39(5): 1564-1572.
[8] ZHU Yong, FENG Xia-ting, ZHOU Hui, ZHANG Chuan-qing, ZHANG Ming-qiang,. Calibration of partial factors of shear strength parameters using standard deviation feedback method [J]. , 2018, 39(1): 151-157.
[9] LI Hong-jiang , TONG Li-yuan, LIU Song-yu, GU Ming-fen, LU Zhan-qiu,. Displacement standards for lateral capacity of rigid pile and flexible pile in soft soil foundation [J]. , 2017, 38(9): 2676-2682.
[10] DONG Lin, WANG Lan-min, XIA Kun, YUAN Xiao-ming,. Comparison of CPT-based and SPT-based liquefaction discrimination methods by Taiwan Chi-Chi earthquake data [J]. , 2017, 38(12): 3643-3648.
[11] ZHOU Xiao-wen, CHEN Ling-wei, CHENG Zhan-lin, WANG Ming-yuan,. Stability controlling standard for embankment construction on soft soil ground [J]. , 2016, 37(9): 2631-2635.
[12] CHEN Guo-xing ，KONG Meng-yun ，LI Xiao-jun ，CHANG Xiang-dong ，ZHOU Guo-liang,. Deterministic and probabilistic triggering correlations for assessment of seismic soil liquefaction at nuclear power plant [J]. , 2015, 36(1): 9-27.
[13] QIAO Li-ping , LIU Jie , LI Shu-cai , WANG Zhe-chao , JIANG Yan-yan , WANG Zi-hao，. Study of spatial effect of excavation face for underground facility and its application [J]. , 2014, 35(S2): 481-487.
[14] ZHANG Guo-feng , LIU Zhi-shuang , CHEN Xian-kun , WANG Yong-wang , XIE Yi，. Reliability analysis of measuring strongly weathered grey mudstone strength with point load measurement [J]. , 2014, 35(S1): 292-298.
[15] SHEN Yan-jun , XU Guang-li , YANG Geng-she , YE Wan-jun，. Probability distribution characteristics of rock mass classification and its mechanical parameters based on fine description [J]. , 2014, 299(2): 565-572.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
No Suggested Reading articles found!
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd