發(fā)布時(shí)間：2018-11-05 14:18

【摘要】：為研究黃土高原植物根系固土力學(xué)機(jī)制,通過(guò)WuWaldron(WWM)模型和Fiber Bundle(FBM)模型,確定了黃土高原地區(qū)主要造林樹(shù)種油松、刺槐、荊條和丁香4種植物根系對(duì)土體抗剪強(qiáng)度的增強(qiáng)作用,并用原位直剪試驗(yàn)對(duì)其進(jìn)行了驗(yàn)證。應(yīng)用ABAQUS有限元軟件構(gòu)建造林邊坡穩(wěn)定性分析模型,通過(guò)數(shù)值模擬的方法從邊坡尺度上量化4種不同植物根系固土作用。結(jié)果表明:通過(guò)原位直剪試驗(yàn)的驗(yàn)證,發(fā)現(xiàn)評(píng)價(jià)植物根系對(duì)土體抗剪強(qiáng)度增強(qiáng)作用的WWM、FBM模型均存在一定的誤差,因而建議進(jìn)一步完善該理論模型。同時(shí),基于原位直剪試驗(yàn)測(cè)定的根系對(duì)土體抗剪強(qiáng)度的增強(qiáng)作用,進(jìn)行邊坡穩(wěn)定性分析,發(fā)現(xiàn)4種植物造林邊坡穩(wěn)定性均高于裸坡,邊坡安全系數(shù)平均提高4.38%,最大等效塑性應(yīng)變平均減小50.08%,最大水平位移平均減小40.83%,最大豎向位移平均減小14.84%;4種植物措施中,荊條造林措施對(duì)淺表層土體的固土效果最佳。研究結(jié)論為評(píng)價(jià)造林邊坡的穩(wěn)定性,揭示根系固土的力學(xué)機(jī)理提供理論基礎(chǔ)和科學(xué)依據(jù)。
[Abstract]:In order to study the soil consolidation mechanism of plant roots in the Loess Plateau, the main afforestation tree species, Pinus tabulaeformis and Robinia pseudoacacia, were determined by WuWaldron (WWM) model and Fiber Bundle (FBM) model. The effects of four plant roots on the shear strength of soil were verified by in-situ direct shear test. The stability analysis model of afforestation slope was established by using ABAQUS finite element software, and the soil consolidation effect of four different plant roots was quantified from slope scale by numerical simulation method. The results show that there are some errors in the WWM,FBM model for evaluating the effect of plant roots on soil shear strength by in-situ direct shear test, so it is suggested that the theoretical model should be further improved. At the same time, based on the enhancement of soil shear strength determined by in-situ direct shear test, the slope stability analysis shows that the stability of the four plant afforestation slopes is higher than that of the bare slope, and the safety factor of the slope is increased by 4.38 on average. The maximum equivalent plastic strain is reduced by 50.08, the maximum horizontal displacement by 40.83 and the maximum vertical displacement by 14.84. Among the four plant measures, the afforestation measures of wattle strip have the best effect on soil consolidation of shallow surface soil. The results provide a theoretical and scientific basis for evaluating the stability of afforestation slope and revealing the mechanics mechanism of soil consolidation by root system.
【作者單位】： 北京林業(yè)大學(xué)水土保持學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(31400616) 國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFC0501704--01)
【分類(lèi)號(hào)】：S714.7

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