›› 2018, Vol. 39 ›› Issue (10): 3727-3734.doi: 10.16285/j.rsm.2016.2312

• 岩土工程研究 • 上一篇    下一篇

裂隙岩体块体化程度评价方法的若干问题修正

陈庆发1, 2,牛文静2,郑文师1, 2,刘俊广1,尹庭昌1, 2,范秋雁1   

  1. 1. 广西大学 资源环境与材料学院,广西 南宁 530004; 2. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071
  • 收稿日期:2016-10-08 出版日期:2018-10-11 发布日期:2018-11-04
  • 作者简介:陈庆发,男,1979年生,博士,教授,主要从事矿山岩石力学和非传统采矿理论的研究与教学工作。
  • 基金资助:
    国家自然科学基金青年科学基金项目(No. 41402306);广西自然科学基金重点项目(No. 2014GXNSFDA118034);广西科学研究与技术开发计划项目(桂科攻1598017-5);岩土力学与工程国家重点实验室资助课题(No. Z016015)。

Correction of the problems of blockiness evaluation method for fractured rock mass

CHEN Qing-fa1, 2, NIU Wen-jing2, ZHENG Wen-shi1, 2, LIU Jun-guang1, YIN Ting-chang1, 2, FAN Qiu-yan1   

  1. 1. College of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi 530004, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2016-10-08 Online:2018-10-11 Published:2018-11-04
  • Supported by:
    This work was supported by the Young Foundation of the National Natural Science Foundation of China (41402306), the Key Projects of Guangxi Province Natural Science Foundation (2014GXNSFDA118034), the Scientific Research & Technological Development Projects of Guangxi (1598017-5) and the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering (Z016015).

摘要: 块体化程度是评价岩体完整性的一种新指标,能从三维角度表征岩体破碎程度,但目前该方法仍存在未充分考虑岩体切割程度及块体规模、未限定基础应用条件、块体化程度等级划分不合理等缺陷。针对上述缺陷,深入分析了其产生原因,并借鉴岩体切割程度、三维块度模数、体积RQD等计算原理,限定了块体体积百分比相关概念,提出了考虑岩体完整性块度尺寸效应的块体体积综合百分比计算方法,确立了块体化程度等级及分级指标取值依据,建立了修正的块体化程度评价方法。通过对比块体化程度评价修正方法、岩土工程规范对岩体完整性的划分结果,分析了修正方法的合理性。分别以广西铜坑矿锌多金属矿体、乌东德水电工程的块体研究数据为基础,开展了修正块体化程度评价方法的实例验证,结果表明:利用修正块体化程度评价方法计算的铜坑矿+255 m中段4#试验区岩体块体体积百分比为11.18%,属轻度块状化岩体;乌东德水电站PD49-1平硐、PD4支硐块体体积百分比分别为12.847%、10.168%,均属于轻度块状化岩体,岩体完整性程度为较完整级别。与现有块体化程度评价方法比较,修正方法计算的块体体积百分比能够更准确地从三维角度表征真实岩体的完整性。研究成果对精确刻画岩体三维完整性具有重要意义。

关键词: 裂隙岩体, 块体化程度评价方法, 块体体积百分比, 缺陷修正, 岩体完整性

Abstract: Blockiness is a new index to evaluate the integrity of rock mass, and it can represent the degree of rock mass fracture in three dimensions. However, current blockiness evaluation methods have not considered the cutting degree of rock mass, the size of the block, unrestricted basic application conditions and unreasonable ratings of blockiness levels. In this study, the causes of these limitations were analysed in-depth. Moreover, the concept of block volume percentage was defined referring to the calculation principles of the rock mass cutting degree, three-dimensional (3D) block modulus and volume RQD. A comprehensive percentage calculation method of block volume was proposed, in which the scale effect of rock blocks was considered. The ratings of blockiness levels and the values of the classification index were determined, and the improved blockiness evaluation method was developed. By comparing the rating results of the modified blockiness evaluation method and the Chinese codes for geotechnical engineering, the rationality of the modified blockiness evaluation method was analysed. Based on the Tongkeng Zn polymetallic orebody and Wudongde Hydropower Project, the case studies of the modified blockiness evaluation method were conducted. The results showed that the block volume percentages of No. 4 testing area at the 255 m level in the Tongkeng Zn polymetallic orebody, the PD49-1 adit and PD4 branch adit in Wudongde Hydropower Station were 11.18%, 12.847% and 10.168% by using the modified block evaluation method, respectively. In addition, they all belonged to slight-blockiness categories, and the rock mass was moderately integrated. Compared with the conventional blockiness evaluation method, the block volume percentage calculated by the modified blockiness evaluation method can more accurately represent the integrity of the rock mass from a 3D perspective. The findings in this study are significant for accurately characterising the 3D integrity of rock mass.

Key words: fractured rock mass, blockiness evaluation method, block volume percentage, defect correction, rock mass integrity

中图分类号: 

  • TU 457
[1] 肖瑶, 邓华锋, 李建林, 支永艳, 熊雨. 长期浸泡作用下灌浆加固裂隙岩体劣化效应[J]. 岩土力学, 2019, 40(S1): 143-151.
[2] 支永艳, 邓华锋, 肖瑶, 段玲玲, 蔡佳, 李建林. 微生物灌浆加固裂隙岩体的渗流特性分析[J]. 岩土力学, 2019, 40(S1): 237-244.
[3] 李 崴, 王者超, 毕丽平, 刘 杰, . 辐射流条件下裂隙岩体渗透性表征单元体尺寸 与等效渗透系数[J]. 岩土力学, 2019, 40(2): 720-727.
[4] 刘艳章, 郭赟林, 黄诗冰, 蔡原田, 李凯兵, 王刘宝, 李 伟, . 冻融作用下裂隙类砂岩断裂特征与强度损失研究[J]. 岩土力学, 2018, 39(S2): 62-71.
[5] 李东奇,李宗利,吕从聪. 考虑裂隙附加水压的岩体断裂强度分析[J]. , 2018, 39(9): 3174-3180.
[6] 杨 昊,张晋勋,单仁亮,武福美,郭志明,. 冻结饱水单裂隙岩体力学特性试验研究[J]. , 2018, 39(4): 1245-1255.
[7] 黄诗冰,刘泉声,程爱平,刘艳章, . 低温裂隙岩体水-热耦合模型研究及数值分析[J]. , 2018, 39(2): 735-744.
[8] 周 喻, 孙 铮, 王 莉, 王 宇, 丁银平, . 单侧限压缩下预制裂隙试样力学特性及板裂化 机制细观研究[J]. 岩土力学, 2018, 39(12): 4385-4394.
[9] 崔 臻,盛 谦, . 裂隙岩体等效力学参数结构效应的计算机模拟试验研究[J]. , 2018, 39(10): 3830-3840.
[10] 杨 超,黄 达,蔡 睿,黄润秋,. 张开穿透型单裂隙岩体三轴卸荷蠕变特性试验[J]. , 2018, 39(1): 53-62.
[11] 黄诗冰,刘泉声,程爱平,刘艳章,. 低温岩体裂隙冻胀力与冻胀扩展试验初探[J]. , 2018, 39(1): 78-84.
[12] 郑 卓,刘人太,李术才,王晓晨,张连震,王洪波. 基于Hoek-Brown准则的岩体注浆加固机制研究[J]. , 2017, 38(S1): 409-417.
[13] 符贵军,张思渊,张玉军. 一种双重孔隙-裂隙岩体流变模型及其在地下洞室有限元分析中的应用[J]. , 2017, 38(2): 601-609.
[14] 张晋勋,杨 昊,单仁亮,武福美,郭志明,. 冻结条件下平行双裂隙岩体力学特性试验研究[J]. , 2017, 38(12): 3573-3580.
[15] 赵 航,李新平,罗 忆,董 千,黄俊红,. 裂隙岩体中弹性波传播特性试验及宏细观损伤本构模型研究[J]. , 2017, 38(10): 2939-2948.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!