【摘要】：圍巖支護(hù)結(jié)構(gòu)穩(wěn)定性是地下結(jié)構(gòu)設(shè)計的關(guān)鍵。針對深部隧道圍巖參數(shù)信息統(tǒng)計不足,引入Information-gap理論,建立支護(hù)圍巖結(jié)構(gòu)非概率可靠性分析方法。給出了無量綱不確定水平參數(shù)的Info-gap模型,根據(jù)系統(tǒng)模型和性能要求得到可靠度分析的穩(wěn)健函數(shù),并將結(jié)構(gòu)發(fā)生失效前能夠容許的不確定參量的最大波動幅值作為穩(wěn)健可靠度指標(biāo)。結(jié)合剪切滑移線場理論,推導(dǎo)了均質(zhì)彈塑性圍巖最優(yōu)支護(hù)阻力,建立圍巖支護(hù)結(jié)構(gòu)穩(wěn)定分析的響應(yīng)函數(shù)。實(shí)例工程展示了穩(wěn)健可靠度分析的具體操作程序。參數(shù)分析表明,支護(hù)阻力越大,結(jié)構(gòu)越穩(wěn)健性;同時,提高巷道圍巖的內(nèi)摩擦角和黏聚力是增加支護(hù)結(jié)構(gòu)穩(wěn)健性的關(guān)鍵。該方法在參數(shù)信息少、樣本數(shù)據(jù)有限情況下,是處理不確定問題的一種合理有效方法。
[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.
【作者單位】： 湖南大學(xué)巖土工程研究所;
【基金】：國家自然科學(xué)基金項(xiàng)目(No.51378195,No.51078136)~~
【分類號】：U451.2

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