本文關(guān)鍵詞：非均質(zhì)和各向異性土質(zhì)淺埋隧道支護力研究　出處：《湖南大學學報(自然科學版)》2017年07期 　論文類型：期刊論文

  更多相關(guān)文章： 隧道工程 支護力 極限分析法 非均質(zhì) 各向異性

【摘要】：針對土體的非均質(zhì)和各向異性,以土質(zhì)淺埋隧道為例,采用極限分析上限法和可靠度方法研究隧道支護力的大小.結(jié)果表明,土體非均質(zhì)和各向異性對支護力的影響程度取決于隧道的埋深.當埋深小于15m時,圍巖的自穩(wěn)能力較差,土體非均質(zhì)和各向異性的影響不能明顯地體現(xiàn)出來,支護力主要隨埋深的增大而增大;當埋深大于20 m時,圍巖的自穩(wěn)能力較強,支護力隨土體非均質(zhì)和各向異性的增大發(fā)生明顯變化,埋深越大,土體非均質(zhì)和各向異性對支護力的影響越強.可靠度研究表明,非均質(zhì)和各向異性參數(shù)的分布及變異系數(shù)的大小對支護力的影響較大,對數(shù)正態(tài)分布時影響更為明顯.建議在土質(zhì)淺埋隧道設(shè)計時,務必考慮土體的非均質(zhì)和各向異性,防止保守支護增加工程成本或支護力不足引起隧道坍塌.
[Abstract]:Aiming at the heterogeneity and anisotropy of soil mass, the limit analysis upper limit method and reliability method are used to study the magnitude of tunnel support force, taking shallow soil tunnel as an example. The influence of heterogeneity and anisotropy on the supporting force depends on the depth of the tunnel. When the buried depth is less than 15m, the self-stability of surrounding rock is poor. The influence of heterogeneity and anisotropy of soil is not obvious, and the support force increases with the increase of buried depth. When the buried depth is more than 20 m, the self-stability of surrounding rock is stronger, and the support force changes obviously with the increase of heterogeneity and anisotropy of the soil, and the deeper the buried depth is, the greater the buried depth is. The study of reliability shows that the distribution of heterogeneity and anisotropy parameters and the magnitude of coefficient of variation have greater influence on the support force. It is suggested that the heterogeneity and anisotropy of soil should be taken into account in the design of shallow buried tunnel in order to prevent the tunnel collapse caused by the increase of engineering cost or insufficient supporting force.
【作者單位】： 中南大學資源與安全工程學院;
【基金】：國家自然科學基金青年基金資助項目(51404303) 中南大學中央高�；究蒲袠I(yè)務費專項資金資助項目(2015zzts084)~~
【分類號】：U455.7
【正文快照】： 大量試驗研究表明,受天然沉積及后期加載等因素影響的土體,其黏聚力往往表現(xiàn)出顯著的非均質(zhì)性和各向異性[1-4].土體的非均質(zhì)性一般與埋深有關(guān),各向異性則與主應力的方向和破壞面的位置有關(guān).巖土工程的穩(wěn)定性與土體的抗剪強度指標息息相關(guān),因此,非均質(zhì)和各向異性對土體的影響成

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