本文關(guān)鍵詞： 淺表層滑坡 根系黏聚力 Wu氏模型 斷裂修正系數(shù) 根截面積比　出處：《林業(yè)科學(xué)》2017年11期 　論文類型：期刊論文

【摘要】：【目的】研究根系黏聚力Wu氏模型的修正系數(shù),可提高Wu氏模型的精確度,進(jìn)而提高造林邊坡穩(wěn)定性評價(jià)的準(zhǔn)確性�！痉椒ā酷槍u氏模型對根系黏聚力的高估問題,以刺槐和側(cè)柏根系為研究對象,應(yīng)用復(fù)合材料學(xué)的連續(xù)破壞理論,闡述根系的漸進(jìn)失效過程,提出基于連續(xù)斷裂過程的根系黏聚力Wu氏模型修正系數(shù),即斷裂修正系數(shù),并研究不同算法間修正系數(shù)的差異性以及修正系數(shù)與根截面積比之間的關(guān)系�！窘Y(jié)果】根系斷裂修正系數(shù)隨算法(P0.001)、樹種(P0.001)和土層深度(P0.001)的變化而有顯著差異;位移控制式算法引入的修正系數(shù)顯著高于由拉力控制式算法引入的修正系數(shù)(P0.001);斷裂修正系數(shù)隨深度的增加而增加,表層30 cm內(nèi)的修正系數(shù)顯著低于深層根系(P0.001);根截面積比與斷裂修正系數(shù)的負(fù)相關(guān)性存在閾值,當(dāng)根截面積比小于閾值時(shí)(刺槐0.14,側(cè)柏0.11),斷裂修正系數(shù)隨著根截面積比的增加而減少;當(dāng)根截面積比大于閾值時(shí),斷裂修正系數(shù)的根截面積比效應(yīng)不顯著�！窘Y(jié)論】根系斷裂修正系數(shù)隨算法和樹種不同而變化,隨土壤深度增加而增大,且在根截面積比閾值范圍內(nèi)(刺槐0.14,側(cè)柏0.11)與根截面積比呈負(fù)相關(guān)關(guān)系。研究結(jié)論能為評價(jià)造林邊坡的穩(wěn)定性、揭示植物護(hù)坡的力學(xué)機(jī)理提供理論基礎(chǔ),并為水土保持工程植物措施的選擇提供科學(xué)依據(jù)。
[Abstract]:[objective] to study the correction coefficient of Wu's model of root cohesion, which can improve the accuracy of Wu's model. In order to improve the accuracy of evaluation of afforestation slope stability. [methods] aiming at the problem of overestimation of root cohesion by Wu's model, Robinia pseudoacacia and Platycladus orientalis roots were studied, and the theory of continuous destruction of composite materials was applied. The progressive failure process of root system is expounded, and the modified coefficient of Wu's model of root cohesion based on continuous fracture process is proposed, which is called fracture correction coefficient. The difference of correction coefficient between different algorithms and the relationship between correction coefficient and root cross-sectional area ratio were studied. [results] the correction coefficient of root fracture with algorithm P0.001). There were significant differences between P0.001) and P0.001 (soil depth). The correction coefficient introduced by the displacement control algorithm is significantly higher than that by the tension control algorithm. The correction coefficient of fracture increased with the increase of depth, and the correction coefficient in surface 30 cm was significantly lower than that in deep root system (P 0.001). The negative correlation between root cross-sectional area ratio and fracture correction coefficient existed threshold, when root cross-sectional area ratio was less than threshold value (Robinia pseudoacacia 0.14, Platycladus orientalis 0.11), fracture correction coefficient decreased with the increase of root cross-sectional area ratio. When the root cross-sectional area ratio was greater than the threshold value, the root cross-sectional area ratio effect of the fracture correction coefficient was not significant. [conclusion] the root fracture correction coefficient varied with the algorithm and tree species, and increased with the increase of soil depth. And in the threshold range of root cross-sectional area ratio (Robinia pseudoacacia 0.14, Platycladus orientalis 0.11) there was a negative correlation between the root cross-sectional area ratio and the root cross-sectional area ratio. To reveal the mechanical mechanism of plant slope protection provides a theoretical basis and provides a scientific basis for the selection of plant measures for soil and water conservation engineering.
【作者單位】： 北京林業(yè)大學(xué)水土保持國家林業(yè)局重點(diǎn)實(shí)驗(yàn)室;寧夏大學(xué)農(nóng)學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(31400616;31560232)
【分類號】：S157
【正文快照】： 山體滑坡易造成人員傷亡和大量財(cái)產(chǎn)損失。以往地質(zhì)學(xué)家常采用土木工程措施防治滑坡,隨著人類對生存環(huán)境的要求越來越高,對生態(tài)文明的可持續(xù)發(fā)展越來越重視,生態(tài)和生物技術(shù)專家開始研究并應(yīng)用植物根系來加固邊坡的“生態(tài)工程”措施(Coppin et al.,1990;Cammeraat et al.,2015;S，

本文編號：1480743