本文選題：邊坡穩(wěn)定性 + 土壤　； 參考：《農(nóng)業(yè)工程學(xué)報(bào)》2017年20期

【摘要】：為了研究賀蘭山青海云杉林(Picea crassifolia)邊坡根土復(fù)合體對邊坡穩(wěn)定性的影響,該文在直剪試驗(yàn)、三軸試驗(yàn)等獲得的土壤參數(shù)基礎(chǔ)上,建立了基于有限元理論的賀蘭山青海云杉林邊坡穩(wěn)定性計(jì)算數(shù)值模型,并在5種坡度條件下(18.43°、21.80°、26.57°、33.69°、45.00°)計(jì)算了無林邊坡和有林邊坡的安全系數(shù)、最大塑性應(yīng)變、最大位移、破壞時(shí)間及它們的增長率隨坡度的變化規(guī)律,并計(jì)算了土壤強(qiáng)度參數(shù)摩擦角、黏聚力、剪脹角與安全系數(shù)的灰色關(guān)聯(lián)度矩陣和平均關(guān)聯(lián)度。結(jié)果表明:1)無林邊坡與有林邊坡的安全系數(shù)隨坡度的變化規(guī)律是一致的,都以冪函數(shù)遞減。有林邊坡相對于無林邊坡安全系數(shù)的增長率以指數(shù)函數(shù)增加,且坡度越陡根土復(fù)合體對邊坡穩(wěn)定性的提高作用越強(qiáng);2)根土復(fù)合體的存在可以延長邊坡的破壞時(shí)間,有林邊坡的破壞時(shí)間均高于無林邊坡,根土復(fù)合體提高邊坡破壞時(shí)間的增長率隨坡度的增大呈拋物線增加,且坡度越陡提高作用越明顯。邊坡破壞時(shí)有無塑性貫通區(qū)會明顯改變最大塑性應(yīng)變、最大位移、破壞時(shí)間的值;3)摩擦角、黏聚力、剪脹角3個(gè)土壤強(qiáng)度參數(shù)中,黏聚力是影響邊坡穩(wěn)定的主導(dǎo)因素,摩擦角、剪脹角的影響次之,此規(guī)律不受邊坡坡度的影響,這是根土復(fù)合體可以顯著影響邊坡穩(wěn)定性的根本原因之一。該文的研究結(jié)果對于解釋森林根土復(fù)合體加固邊坡作用的本質(zhì)、推進(jìn)邊坡穩(wěn)定性計(jì)算的數(shù)值模擬、防治賀蘭山淺層滑坡及水土流失災(zāi)害都具有重要的意義。
[Abstract]:In order to study the effect of root soil complex on slope stability of Picea crassifolia slope in Helan Mountain, the soil parameters obtained by direct shear test and triaxial test were studied. A numerical model for calculating the slope stability of Picea crassifolia forest in Helan Mountain was established based on the finite element theory. The safety factor, maximum plastic strain, maximum displacement of the slope without forest, maximum plastic strain and maximum displacement were calculated under five kinds of slope conditions: 18.43 擄~ 21.80 擄~ 26.57 擄~ 33.69 擄~ 45.00 擄). The damage time and their growth rate vary with the slope. The grey correlation matrix and the average correlation degree between the friction angle, cohesion force, shear expansion angle and safety factor of soil strength parameters are calculated. The results show that the variation of safety coefficient with slope is consistent with that of forest slope, and both of them decrease with power function. The increase rate of safety factor of forest slope compared with that of non-forest slope increases with exponential function, and the steeper the slope is, the stronger the effect of the root soil complex on the slope stability is; (2) the existence of the root soil complex can prolong the failure time of the slope. The failure time of forest slope is higher than that of no forest slope. The increasing rate of root soil complex increasing slope failure time is parabola with the increase of slope, and the steeper the slope is, the more obvious the effect is. The maximum plastic strain, the maximum displacement, the value of the failure time, the friction angle, the cohesion force and the shear expansion angle are three soil strength parameters, the cohesive force is the main factor that affects the slope stability, and the friction angle is the main factor that affects the slope stability, among the three soil strength parameters: the maximum plastic strain, the maximum displacement, the failure time and the shear expansion angle. The influence of shear expansion angle is second, and this law is not affected by slope gradient, which is one of the fundamental reasons that root soil complex can significantly affect slope stability. The results of this paper are of great significance to explain the nature of forest root-soil complex strengthening slope, to promote the numerical simulation of slope stability calculation and to prevent shallow landslide and soil erosion disaster in Helan Mountain.
【作者單位】： 寧夏大學(xué)農(nóng)學(xué)院;北京林業(yè)大學(xué)水土保持學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(31560232;31400616)
【分類號】：S714.7

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