CHENG Shengdong,HANG Penglei,LI Peng,et al.Effects of Terracing on the Slope Stability in the Rocky Mountain Area of Southern Shaanxi Province[J].Research of Soil and Water Conservation,2018,25(05):157-161.
陕南土石山区坡改梯对坡面稳定性的影响
- Title:
- Effects of Terracing on the Slope Stability in the Rocky Mountain Area of Southern Shaanxi Province
- Keywords:
- rocky mountain area; soil and water conservation; terrace; stability; layout of terraced section
- 分类号:
- S157.3+1
- 摘要:
- 梯田是土石山区水土流失治理的主要措施。以陕南土石山区为研究对象，研究坡耕地改建成梯田后对坡面整体稳定性的影响，采用实地调查取样、室内试验和软件分析相结合的方法，分析了坡改梯前后梯田土层厚度、田坎坡度以及田面宽度对梯田坡面稳定性的影响。结果表明：（1）15°坡面修建梯田后坡面安全系数降低了45%，25°坡面修建梯田后坡面安全系数降低了73%，15°坡面修建梯田稳定性优于25°坡面；（2）在相同的坡长和坡度下，修建梯田后坡面安全系数与土层厚度成正比，与田坎坡度和田面宽度成反比。研究结果可为土石山区梯田的断面布局提供理论依据。
- Abstract:
- Terrace was one of the main measures to control soil loss in the rocky mountain area of southern Shaanxi Province. The objective of this study was to examine the effects of terracing on slope stability, and it is very important to terrace collapse and to control soil loss. Based on the filed survey sampling, laboratory experiments and combined with model calculations, we analyzed the influence of the slope stability after terracing, and discussed the effects of soil thickness, ridge slope and the width of filed surface on the slope stability. Results show that the slope safety factor would decrease by 45% on the slope 15° and by 73% on the slope 25° after the construction of terraces. The stability of terracing on the 15° slope is better than the 25° slope. Under the same slope length and gradient, the safety factor is directly proportional with soil thickness and inversely proportional with the ridge slope and width of the field surface. These results can provide scientific basis for the layout of terraced section in the rocky mountain area of southern Shaanxi Province.
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备注/Memo
收稿日期:2017-08-15;改回日期:2017-10-20。
基金项目:国家重点研发计划项目（2017YFC0504704）；国家自然科学基金（51609196）
作者简介:程圣东(1983-),男,安徽霍山县人,博士,讲师,从事土壤侵蚀与水土保持等研究。E-mail:xautcsd@163.com
通讯作者:李鹏(1974-),男,山东烟台人,博士,教授,主要从事土壤侵蚀与水土保持等研究。E-mail:lipeng74@163.com