本文選題：削坡　切入點(diǎn)：離散元　出處：《河北工業(yè)大學(xué)》2014年碩士論文

【摘要】：本論文研究依托于河北省高速公路管理局科技項(xiàng)目:“類土質(zhì)路塹高邊坡穩(wěn)定性分析與支護(hù)技術(shù)研究�！鳖愅临|(zhì)邊坡的特性不同于單純的均質(zhì)土邊坡及巖質(zhì)邊坡，而是介于兩者之間，既有土邊坡的特性，也有巖石邊坡的特性。高速公路邊坡滑塌問題成為近年來(lái)影響高速公路安全的主要因素。 在邢汾高速公路深路塹一次削坡完成之后，有部分路塹發(fā)生了滑塌現(xiàn)象，工程上可能是由于施工過程中對(duì)路塹應(yīng)力產(chǎn)生了較大的擾動(dòng)，加之一次削坡邊坡坡率較大，在暴雨等情況下極易發(fā)生滑塌，于是決定對(duì)邊坡進(jìn)行二次削坡。 為此本課題利用離散元軟件UDEC建立不同坡率下的二維離散元數(shù)值模型，分析不同坡率下坡體各高程點(diǎn)位移變化，巖體和節(jié)理的應(yīng)力變化以及在滲流條件下高程點(diǎn)位移和節(jié)理剪應(yīng)力變化，得出兩次削坡之后以及滲流條件下邊坡的安全系數(shù)，取得以下結(jié)論：一次削坡之后產(chǎn)生較大的水平位移，在坡頂出現(xiàn)局部張拉區(qū)域，在坡腳產(chǎn)生剪應(yīng)力集中帶，節(jié)理剪應(yīng)力接近節(jié)理抗剪強(qiáng)度，安全系數(shù)較低，使邊坡處于臨界平衡狀態(tài)；二次削坡之后水平位移減小，坡頂張拉區(qū)基本消失或不存在張拉區(qū)，坡腳處剪應(yīng)力集中帶減小，，節(jié)理剪應(yīng)力有較大程度降低，安全系數(shù)有較大提高，增大邊坡安全儲(chǔ)備，使邊坡處于較穩(wěn)定狀態(tài)。 根據(jù)上述對(duì)比研究的結(jié)果，本文對(duì)邢汾高速邊坡二次削坡坡率的優(yōu)化設(shè)計(jì)做理論上的評(píng)估，為其他邊坡坡率的優(yōu)化設(shè)計(jì)提供參考，對(duì)類似工程的施工具有指導(dǎo)意義。
[Abstract]:The research of this paper is based on the science and technology project of Hebei Expressway Administration Bureau: "the stability analysis and support technology research of high slope of similar soil cut."The characteristics of soil-like slope are different from those of homogeneous soil slope and rock slope, but lie between them, which have the characteristics of both soil slope and rock slope.Slope collapse has become a major factor affecting highway safety in recent years.After the completion of deep cutting slope in Xingfen Expressway, part of the cutting has been sloughed, which may be due to the great disturbance to the cutting stress in the construction process and the high slope ratio at the edge of the cutting slope at the same time.It is easy to collapse in the case of heavy rain, so it is decided to cut the slope twice.In this paper, a two-dimensional discrete element numerical model with different slope ratios is established by using discrete element software UDEC, and the displacement changes of different elevation points under different slope ratios are analyzed.The variation of stress of rock mass and joint, the displacement of elevation point and shear stress of joint under seepage condition, and the safety factor of slope after twice slope cutting and under seepage condition are obtained.The following conclusions are obtained: after the first slope cutting, a large horizontal displacement occurs, a local tension area appears at the top of the slope, and a shear stress concentration zone occurs at the foot of the slope. The joint shear stress is close to the shear strength of the joint, and the safety factor is low.The slope is in critical equilibrium state, the horizontal displacement decreases after the second slope clipping, the tension area of the top of the slope disappears basically or there is no tension zone, the shear stress concentration zone at the foot of the slope decreases, the joint shear stress decreases to a large extent, and the safety factor is greatly improved.Increase the slope safety reserve, make the slope in a more stable state.Based on the results of the above comparative study, this paper makes a theoretical evaluation on the optimal design of the slope rate of secondary cutting of Xingfen high speed slope, which provides a reference for the optimization design of the slope rate of other sides, and has a guiding significance for the construction of similar projects.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.1

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