基于Info-gap理论的支护围岩稳健可靠性分析
发布时间：2018-08-22 14:38
【摘要】：围岩支护结构稳定性是地下结构设计的关键。针对深部隧道围岩参数信息统计不足,引入Information-gap理论,建立支护围岩结构非概率可靠性分析方法。给出了无量纲不确定水平参数的Info-gap模型,根据系统模型和性能要求得到可靠度分析的稳健函数,并将结构发生失效前能够容许的不确定参量的最大波动幅值作为稳健可靠度指标。结合剪切滑移线场理论,推导了均质弹塑性围岩最优支护阻力,建立围岩支护结构稳定分析的响应函数。实例工程展示了稳健可靠度分析的具体操作程序。参数分析表明,支护阻力越大,结构越稳健性;同时,提高巷道围岩的内摩擦角和黏聚力是增加支护结构稳健性的关键。该方法在参数信息少、样本数据有限情况下,是处理不确定问题的一种合理有效方法。
[Abstract]:The stability of surrounding rock supporting structure is the key of underground structure design. In view of the lack of statistical information of surrounding rock parameters in deep tunnel, the non-probabilistic reliability analysis method of supporting surrounding rock structure is established by introducing Information-gap theory. The Info-gap model with dimensionless uncertain horizontal parameters is given, and the robust function of reliability analysis is obtained according to the system model and performance requirements. The maximum fluctuation amplitude of the uncertain parameter which can be allowed before the failure of the structure is taken as the robust reliability index. Combined with the theory of shear slip line field, the optimal support resistance of homogeneous elastoplastic surrounding rock is derived, and the response function of stability analysis of surrounding rock supporting structure is established. The concrete operation procedure of robust reliability analysis is demonstrated by an example project. Parameter analysis shows that the greater the support resistance, the more robust the structure, and the key to increase the stability of the support structure is to increase the angle of internal friction and cohesion of surrounding rock of roadway. This method is a reasonable and effective method for dealing with uncertain problems under the condition of little parameter information and limited sample data.
【作者单位】： 湖南大学岩土工程研究所;
【基金】：国家自然科学基金项目(No.51378195,No.51078136)~~
【分类号】：U451.2
本文编号：2197397
[Abstract]:The stability of surrounding rock supporting structure is the key of underground structure design. In view of the lack of statistical information of surrounding rock parameters in deep tunnel, the non-probabilistic reliability analysis method of supporting surrounding rock structure is established by introducing Information-gap theory. The Info-gap model with dimensionless uncertain horizontal parameters is given, and the robust function of reliability analysis is obtained according to the system model and performance requirements. The maximum fluctuation amplitude of the uncertain parameter which can be allowed before the failure of the structure is taken as the robust reliability index. Combined with the theory of shear slip line field, the optimal support resistance of homogeneous elastoplastic surrounding rock is derived, and the response function of stability analysis of surrounding rock supporting structure is established. The concrete operation procedure of robust reliability analysis is demonstrated by an example project. Parameter analysis shows that the greater the support resistance, the more robust the structure, and the key to increase the stability of the support structure is to increase the angle of internal friction and cohesion of surrounding rock of roadway. This method is a reasonable and effective method for dealing with uncertain problems under the condition of little parameter information and limited sample data.
【作者单位】： 湖南大学岩土工程研究所;
【基金】：国家自然科学基金项目(No.51378195,No.51078136)~~
【分类号】：U451.2
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1 李媛;基于Info-Gap理论的基桩下伏岩溶顶板稳定性分析方法[D];湖南大学;2012年
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