含植被坡体稳定性的年际变化规律研究
发布时间：2019-05-17 04:12
【摘要】：植被对边坡稳定的影响主要体现在2方面,一是植物地上部分的自重以及风荷载对坡面的压力;二是植物根系的固土作用。植物种类和生长期对含植被坡体土壤抗剪强度的影响随植物的生长发育过程而变化,且这种变化难以量化。本文通过构建单株植物模型,分析含有不同类型植被的浅层均质土坡安全系数的年际变化规律。结果表明,在综合考虑植被自重、风荷载和根系的影响条件下,含侧柏和荆条的坡体安全系数会随着植物的生长发育逐渐增大,分别在树龄为50年和30年左右达到峰值1.549和1.817,随后趋于稳定,二者的峰值安全系数较植被种植初期分别增加46.8%和54.9%。植被自重和风荷载减弱坡体的稳定性,其中植被自重影响相对较小,使含侧柏和荆条坡体的安全系数分别降低0.1%和0.7%,而风荷载的影响较为明显,使其安全系数分别降低5.9%和5.8%。研究结果可为正确评估坡体稳定性以及布设植物护坡措施提供一定的科学参考。
[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.
【作者单位】： 北京林业大学水土保持学院;北京林业大学北京市水土保持工程技术研究中心;
【基金】：国家自然科学基金面上项目“基于数值模拟的植物根系对人工土质边坡稳定性效应”(31570707)
【分类号】：S157
，
本文编号：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.
【作者单位】： 北京林业大学水土保持学院;北京林业大学北京市水土保持工程技术研究中心;
【基金】：国家自然科学基金面上项目“基于数值模拟的植物根系对人工土质边坡稳定性效应”(31570707)
【分类号】：S157
，
本文编号：2478792
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