含植被坡體穩(wěn)定性的年際變化規(guī)律研究
發(fā)布時間：2019-05-17 04:12
【摘要】：植被對邊坡穩(wěn)定的影響主要體現(xiàn)在2方面,一是植物地上部分的自重以及風荷載對坡面的壓力;二是植物根系的固土作用。植物種類和生長期對含植被坡體土壤抗剪強度的影響隨植物的生長發(fā)育過程而變化,且這種變化難以量化。本文通過構(gòu)建單株植物模型,分析含有不同類型植被的淺層均質(zhì)土坡安全系數(shù)的年際變化規(guī)律。結(jié)果表明,在綜合考慮植被自重、風荷載和根系的影響條件下,含側(cè)柏和荊條的坡體安全系數(shù)會隨著植物的生長發(fā)育逐漸增大,分別在樹齡為50年和30年左右達到峰值1.549和1.817,隨后趨于穩(wěn)定,二者的峰值安全系數(shù)較植被種植初期分別增加46.8%和54.9%。植被自重和風荷載減弱坡體的穩(wěn)定性,其中植被自重影響相對較小,使含側(cè)柏和荊條坡體的安全系數(shù)分別降低0.1%和0.7%,而風荷載的影響較為明顯,使其安全系數(shù)分別降低5.9%和5.8%。研究結(jié)果可為正確評估坡體穩(wěn)定性以及布設植物護坡措施提供一定的科學參考。
[Abstract]:The influence of vegetation on slope stability is mainly reflected in two aspects, one is the weight of the above ground part of the plant and the pressure of the wind load on the slope surface, the other is the soil fixation of the plant root system. The effects of plant species and growth period on soil shear strength of vegetation-bearing slopes varied with the growth and development of plants, and this change was difficult to quantify. In this paper, the interannual variation of safety factor of shallow homogeneous soil slope with different types of vegetation was analyzed by constructing a single plant model. The results showed that the safety factor of slope containing Platycladus orientalis and Tripterygium wilfordii increased gradually with the growth and development of plants under the conditions of vegetation weight, wind load and root system. The peaks reached 1.549 and 1.817 at the age of 50 years and 30 years, respectively, and then tended to be stable. The peak safety factors of the two increased by 46.8% and 54.9%, respectively, compared with the initial stage of vegetation planting. Vegetation weight and wind load weaken the stability of slope, in which the influence of vegetation weight is relatively small, which reduces the safety factor of Platycladus orientalis and Tripterygium wilfordii slopes by 0.1% and 0.7%, respectively, while the influence of wind load is more obvious. The safety factor is reduced by 5.9% and 5.8%, respectively. The research results can provide some scientific reference for the correct evaluation of slope stability and the arrangement of plant slope protection measures.
【作者單位】： 北京林業(yè)大學水土保持學院;北京林業(yè)大學北京市水土保持工程技術(shù)研究中心;
【基金】：國家自然科學基金面上項目“基于數(shù)值模擬的植物根系對人工土質(zhì)邊坡穩(wěn)定性效應”(31570707)
【分類號】：S157
，
本文編號：2478792
[Abstract]:The influence of vegetation on slope stability is mainly reflected in two aspects, one is the weight of the above ground part of the plant and the pressure of the wind load on the slope surface, the other is the soil fixation of the plant root system. The effects of plant species and growth period on soil shear strength of vegetation-bearing slopes varied with the growth and development of plants, and this change was difficult to quantify. In this paper, the interannual variation of safety factor of shallow homogeneous soil slope with different types of vegetation was analyzed by constructing a single plant model. The results showed that the safety factor of slope containing Platycladus orientalis and Tripterygium wilfordii increased gradually with the growth and development of plants under the conditions of vegetation weight, wind load and root system. The peaks reached 1.549 and 1.817 at the age of 50 years and 30 years, respectively, and then tended to be stable. The peak safety factors of the two increased by 46.8% and 54.9%, respectively, compared with the initial stage of vegetation planting. Vegetation weight and wind load weaken the stability of slope, in which the influence of vegetation weight is relatively small, which reduces the safety factor of Platycladus orientalis and Tripterygium wilfordii slopes by 0.1% and 0.7%, respectively, while the influence of wind load is more obvious. The safety factor is reduced by 5.9% and 5.8%, respectively. The research results can provide some scientific reference for the correct evaluation of slope stability and the arrangement of plant slope protection measures.
【作者單位】： 北京林業(yè)大學水土保持學院;北京林業(yè)大學北京市水土保持工程技術(shù)研究中心;
【基金】：國家自然科學基金面上項目“基于數(shù)值模擬的植物根系對人工土質(zhì)邊坡穩(wěn)定性效應”(31570707)
【分類號】：S157
，
本文編號：2478792
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