本文選題：水平成層土質(zhì)邊坡 + 破壞機(jī)理��； 參考：《湖南科技大學(xué)》2015年碩士論文

【摘要】：傳統(tǒng)土質(zhì)邊坡穩(wěn)定性研究的成果豐碩,但水平層狀土質(zhì)邊坡具有其特殊的破壞方式以及承載特性,因此對(duì)水平層狀土質(zhì)邊坡的研究具有實(shí)用價(jià)值。在采用室內(nèi)模型試驗(yàn)與數(shù)值模擬確定水平成層土質(zhì)邊坡的破壞機(jī)理及承載特性的基礎(chǔ)上,通過(guò)極限平衡法對(duì)水平層狀土質(zhì)邊坡的穩(wěn)定性計(jì)算方法進(jìn)行研究。得出:1、通過(guò)室內(nèi)模型試驗(yàn)?zāi)M水平層狀土質(zhì)邊坡在坡頂荷載下邊坡的豎向沉降、水平位移、極限承載力及破壞模式,得出:水平層狀土質(zhì)邊坡破壞面形式為圓弧面+平面,豎向沉降最大值產(chǎn)生于坡頂加載板位置處,水平位移最大值出現(xiàn)在邊坡薄弱層處;通過(guò)不同工況對(duì)比分析發(fā)現(xiàn),水平層狀邊坡的極限荷載隨著層厚增大而增大,邊坡高度對(duì)極限荷載的影響不明顯。2、運(yùn)用數(shù)值模擬對(duì)室內(nèi)五組模型試驗(yàn)進(jìn)行分析,其分析結(jié)果與模型試驗(yàn)較為接近;通過(guò)數(shù)值模擬得出了:(1)水平層狀土質(zhì)邊坡在坡頂不同加載寬度、不同層厚、不同坡比的滑動(dòng)面剪出位置的變化情況;(2)水平成層土坡滑動(dòng)面剪出高度與加載寬度之間的關(guān)系;(3)極限荷載隨著層厚、坡比的增大而增大;當(dāng)荷載作用范圍增大時(shí),極限承載力隨之減小。3、運(yùn)用極限平衡法基本理論,針對(duì)圓弧面+平面組合型滑動(dòng)面的破壞模式,推導(dǎo)了水平層狀土質(zhì)邊坡極限平衡豎向條分法極限承載力計(jì)算公式,該公式同時(shí)滿足力平衡以及力矩平衡,且計(jì)算結(jié)果與室內(nèi)模型試驗(yàn)結(jié)果較為接近。4、考慮到水平層狀土質(zhì)邊坡分層特性,依托極限平衡理論,將水平條分法運(yùn)用于該類邊坡的穩(wěn)定性計(jì)算中,推導(dǎo)了其穩(wěn)定性系數(shù)以及極限承載力的計(jì)算公式。利用該公式計(jì)算得到的結(jié)果較之于室內(nèi)模型試驗(yàn)結(jié)果偏高,其平均差值小于豎向條分法與模型試驗(yàn)結(jié)果的差值。5、以數(shù)值分析得到的滑動(dòng)面為基礎(chǔ),簡(jiǎn)要的推導(dǎo)了水平層狀邊坡三維極限平衡穩(wěn)定性系數(shù)的計(jì)算公式,且其計(jì)算結(jié)果與數(shù)值分析結(jié)果較為接近,三維極限平衡法具有一定的參考意義。
[Abstract]:The research on the stability of the traditional soil slope is fruitful, but the horizontal layered soil slope has its special failure mode and bearing characteristics, so it is of practical value to study the horizontal layered soil slope.On the basis of indoor model test and numerical simulation to determine the failure mechanism and bearing characteristics of horizontal layered soil slope, the stability calculation method of horizontal layered soil slope is studied by limit equilibrium method.Through indoor model test, the vertical settlement, horizontal displacement, ultimate bearing capacity and failure mode of horizontal layered soil slope under top load are simulated. It is concluded that the failure surface of horizontal layered soil slope is arc plane.The maximum vertical settlement occurs at the top of the slope, and the maximum horizontal displacement occurs in the weak layer of the slope. Through the comparative analysis of different working conditions, it is found that the ultimate load of the horizontal layered slope increases with the increase of the layer thickness.The influence of slope height on ultimate load is not obvious. 2. Numerical simulation is used to analyze five groups of indoor model tests, and the results are close to those of model tests.Through numerical simulation, it is obtained that the horizontal layered soil slope has different loading width and different layer thickness at the top of the slope.The relationship between the shear height and the loading width of the sliding surface of the horizontal soil slope increases with the increase of the thickness of the floor and the slope ratio, and increases with the increase of the load range.The ultimate bearing capacity of horizontal layered soil slope is reduced by using the basic theory of limit equilibrium method, and the formula of ultimate bearing capacity of horizontal layered soil slope by using the ultimate equilibrium vertical strip method is derived according to the failure mode of the combined sliding surface of arc plane.The formula satisfies both force balance and moment balance, and the calculated results are close to that of indoor model test. Considering the stratification characteristics of horizontal layered soil slope, the formula relies on the limit equilibrium theory.The horizontal strip method is applied to the stability calculation of this kind of slope, and the formula of its stability coefficient and ultimate bearing capacity is derived.The calculated results obtained by this formula are higher than those of indoor model tests, and the average difference is less than that of vertical strip method and model test results, which is based on the sliding surface obtained by numerical analysis.The calculation formula of 3D limit equilibrium stability coefficient of horizontal layered slope is deduced, and the result is close to that of numerical analysis. The 3D limit equilibrium method has certain reference significance.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU43

【共引文獻(xiàn)】

相關(guān)期刊論文 前1條

1 鄧東平;李亮;;兩種滑動(dòng)面型式下邊坡穩(wěn)定性計(jì)算方法的研究[J];巖土力學(xué);2013年02期

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本文編號(hào)：1773664