隧道岩质围岩亚级分级可靠度分析方法及其工程应用

doi:10.16285/j.rsm.2016.2785

›› 2018, Vol. 39 ›› Issue (3): 967-376.doi: 10.16285/j.rsm.2016.2785

隧道岩质围岩亚级分级可靠度分析方法及其工程应用

李术才，贺鹏，李利平，张乾青，石少帅，徐飞，刘洪亮

山东大学岩土与结构工程研究中心，山东济南 250061

收稿日期:2016-11-30 出版日期:2018-03-12 发布日期:2018-06-06
通讯作者: 贺鹏，男，1988年生，博士研究生，主要从事岩体结构稳定可靠性分析及动态评估方面的研究。E-mail: hepenghank@163.com E-mail:lishucai@sdu.edu.cn
作者简介:李术才，男，1965年生，博导，主要从事断续节理岩体力学特性和锚固机理及不良地质超前预报研究
基金资助:
国家重点基础研究发展计划（973）项目（No.2013CB036000）；国家自然科学基金资助项目（No.51479106）。

Reliability analysis method of sub-classification of tunnel rock mass and its engineering application

LI Shu-cai, HE Peng, LI Li-ping, ZHANG Qian-qing, SHI Shao-shuai, XU Fei, LIU Hong-liang

Geotechnical and Structural Engineering Research Center, Shandong University, Ji’nan, Shandong 250061, China

Received:2016-11-30 Online:2018-03-12 Published:2018-06-06
Supported by:
This work was supported by the State Key Development Program for Basic Research Program of China (2013CB036000) and the National Natural Science Foundation of China (51479106).

摘要/Abstract

摘要： 在隧道工程岩体分级中，由于岩土体参数本身的不确定性，加之各定性、定量评定指标在获取过程中由仪器误差、人为操作等产生的离散性及随机性，往往是应用同一评价体系及分级标准，却得出不同的评判等级，尤其是在围岩亚级分级中，评定结果鲁棒性差，甚至出现跳级，这就决定了围岩类别的可靠性的存在。据此，基于《工程岩体分级标准》，通过分析岩石强度及岩体完整程度等评价指标的概率分布规律，引入体系可靠度分析理论，构建不同围岩等级的功能函数，经Monte Carlo法计算围岩隶属于各评定等级的可靠概率，进而提出了基于国标BQ法的围岩亚级分级可靠度分析方法。该方法充分利用了分类系统本身蕴含的信息，考虑了评价指标的不确定性及离散性，所计算可靠性指标可更为直观地对围岩等级作出稳健评估，且可靠概率在一定程度上综合考虑了包括局部破碎带、软弱夹层等掌子面围岩信息的离散程度。研究成果应用于济南绕城高速老虎山超大断面隧道的围岩亚级分级中，所评价结果与实际围岩等级完全吻合，且各等级可靠指标的延续性可对隧道施工过程中地质属性的变化情况进行定量表征，有助于工程地质人员据此对围岩质量的渐变过程进行动态评估，为合理确定工法转换区间，优化支护参数提供数据支撑。研究成果对类似超大断面隧道的围岩亚级分级有一定参考价值。

关键词: 围岩亚级分级, 可靠度分析理论, 不确定性分析, BQ法, 工程应用

Abstract: During the classification of surrounding rock in tunnel engineering, different results are normally obtained by the same evaluation system and classification standard. It is caused by the uncertainty of rock parameters and the discreteness and randomicity of evaluation indices, which are resulted from the instrument error and artificial operation in the testing process. Especially in the sub-classification of surrounding rock, evaluation results usually have poor robustness, even grade skipping. Hence, it is necessary to investigate the reliability of surrounding rock classification. Based on the handbook of Engineering Rock Classification Standards, we analysed the probability distribution function of rock strength and rock mass integrity index. The system reliability analysis theory was also introduced to build the function of different surrounding rock grades. Moreover, Monte Carlo method was applied to calculate the reliable probability belonging to different evaluation levels. Finally, the reliability analysis method was proposed for the sub-classification of surrounding rock, according to the basic quality (BQ) method. Since this method takes into account the uncertainty and discreteness of the evaluation indices sufficiently, the calculated reliability indices can make a more steady evaluation result. Besides, the reliable probability can reflect the dispersion degree of working face information of the developed fault fracture zone and the weak interlayer to a certain extent. This method was applied to the surrounding rock sub-classification of Laohushan tunnel in Jinan belt highway. It was found that the evaluation results were consistent with the actual levels of surrounding rock. Besides, the continuity of reliability indices at different surrounding rock levels can quantitatively express the changing conditions of geological attributes during the tunnel construction. Therefore, this study provides data support for the transformation of construction method and the optimisation of supporting parameters. Research results have significant references for surrounding rock sub-classification in large-cross-section tunnels.

Key words: sub-classification of surrounding rock, reliability analysis theory, uncertainty analysis, rock mass basic quality (BQ), engineering application

中图分类号:

TU 457

李术才，贺鹏，李利平，张乾青，石少帅，徐飞，刘洪亮. 隧道岩质围岩亚级分级可靠度分析方法及其工程应用[J]. , 2018, 39(3): 967-376.

LI Shu-cai, HE Peng, LI Li-ping, ZHANG Qian-qing, SHI Shao-shuai, XU Fei, LIU Hong-liang. Reliability analysis method of sub-classification of tunnel rock mass and its engineering application[J]. , 2018, 39(3): 967-376.

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隧道岩质围岩亚级分级可靠度分析方法及其工程应用

Reliability analysis method of sub-classification of tunnel rock mass and its engineering application

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