本文選題：巖土工程　切入點(diǎn)：錨桿　出處：《巖石力學(xué)與工程學(xué)報(bào)》2017年09期

【摘要】：針對(duì)巖體離層作用下錨桿受力特性全歷程分析問(wèn)題,基于錨固界面的雙指數(shù)曲線模型,采用荷載傳遞方法,建立離層作用下錨桿受力特性的非線性解答,分析離層發(fā)展全歷程過(guò)程中錨桿軸力和界面剪應(yīng)力分布,以及巖體離層 錨桿軸力曲線的特性,并采用模型試驗(yàn)數(shù)據(jù)進(jìn)行對(duì)比驗(yàn)證。結(jié)果表明:錨桿軸向應(yīng)變的計(jì)算值與實(shí)測(cè)結(jié)果基本一致。離層發(fā)展過(guò)程中,錨桿軸力呈現(xiàn)先增大后減小的特性,且在離層發(fā)展后期具有明顯的非線性特征。離層產(chǎn)生的錨桿軸力和界面剪應(yīng)力均呈現(xiàn)明顯的不均勻分布和非線性特征,且二者均隨著離層的發(fā)展向兩端傳遞。離層位置對(duì)錨桿的受力特性有很大影響:離層位于錨桿中心時(shí),其兩側(cè)的錨桿軸力與界面剪應(yīng)力均成對(duì)稱(chēng)分布,且隨著離層發(fā)展的演變規(guī)律相同;離層偏離錨桿中心時(shí),兩側(cè)錨桿軸力與界面剪應(yīng)力分布則明顯不同,界面剪應(yīng)力在離層位置處存在著跳躍點(diǎn),且錨固長(zhǎng)度較小一側(cè)的錨固界面先產(chǎn)生塑性變形直至整體滑移破壞,決定了錨桿所能承受的離層和抗拔荷載大小。研究結(jié)果為巖體離層作用下錨桿的受力分析提供了理論參考。
[Abstract]:Aiming at the whole history analysis of the stress characteristics of anchors under the action of rock mass separation, based on the double exponential curve model of anchoring interface, the nonlinear solution of the stress characteristics of anchors under the action of rock mass separation is established by using the method of load transfer. The axial force distribution and interface shear stress distribution of anchors and the characteristics of axial force curves of anchors in rock mass are analyzed during the whole course of development. The results show that the calculated values of the axial strain of the anchor rod are in good agreement with the measured results, and the axial force of the anchor rod increases first and then decreases during the development of the separated layer. The axial force and interfacial shear stress of the anchor are distributed unevenly and nonlinearly during the later stage of the development of the separation layer, and the axial force and the interfacial shear stress of the rock bolt produced by the separation layer show obvious non-uniform distribution and nonlinear characteristics. And both of them are transferred to both ends with the development of the separated layer. The location of the detached layer has a great influence on the mechanical characteristics of the anchor rod. When the separated layer is located in the center of the anchor rod, the axial force and the interface shear stress of the anchor rod on both sides are symmetrically distributed. The distribution of axial force and interfacial shear stress is obviously different when the separated layer deviates from the center of the anchor, and the interfacial shear stress has a jump point at the location of the separated layer. The anchoring interface on the smaller side of the anchoring length first produces plastic deformation until the whole slip failure, which determines the magnitude of the uplift and uplift load that the anchor can bear. The research results provide a theoretical reference for the analysis of the stress of the anchor rod under the action of rock mass separation.
【作者單位】： 湖南大學(xué)巖土工程研究所;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51508180) 中國(guó)博士后科學(xué)基金(2015M570678) 中央高�；究蒲袠I(yè)務(wù)費(fèi)~~
【分類(lèi)號(hào)】：TU476

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本文編號(hào)：1665553