坡顶加载时黏性土坡土钉加固前后的离心模型试验比较研究

›› 2011, Vol. 32 ›› Issue (S1): 364-0369.

坡顶加载时黏性土坡土钉加固前后的离心模型试验比较研究

曹洁，张嘎，王丽萍

清华大学水沙科学与水利水电工程国家重点实验室，北京 100084

收稿日期:2011-01-26 出版日期:2011-05-15 发布日期:2011-05-16
作者简介:曹洁，女，1988年生，硕士，主要从事边坡及加固方面的研究
基金资助:
“973”课题（No. 2007CB714108）；国家自然科学基金（No. 50979045）。

Comparison between unreinforced and soil nail-reinforced cohesive soil slopes under load condition in centrifuge model tests

CAO Jie, ZHANG Ga, WANG Li-ping

State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China

Received:2011-01-26 Online:2011-05-15 Published:2011-05-16

摘要/Abstract

摘要： 为研究坡顶加载条件下黏性土坡的承载特性和变形规律，进行了素土坡和土钉加固土坡的加载离心模型试验。测量了土坡的承载和变形过程。通过对比两种土坡的承载特性和变性规律，土钉的加固作用体现在：限制了土坡向坡面方向的位移，使土坡的承载能力得到了明显提高；在加固土坡内形成的土钉影响区域改善了加载底板边缘处的薄弱程度；增大了土坡中上部土体的竖向压缩变形，减小了剪切变形，增强了土坡的稳定性。土坡上部土钉的加固效果随着坡顶荷载的增大而越明显；土坡中下部土与土钉的相互作用越靠近坡面越强

关键词: 坡顶加载, 黏性土坡, 离心模型试验, 土钉

Abstract: In order to investigate the bearing behavior and deformation rules of cohesive soil slopes during crest loading, centrifuge model tests of unreinforced slope and soil nail-reinforced slope were conducted. The loading and deformation process were observed and measured. Based on the comparison of bearing capacity and deformation rules between the unreinforced and soil nail-reinforced slope, the results show that soil nails improve the bearing capacity of slope obviously by confining the displacement toward slope surface. The deformation on the weakest location-footing edge is enhanced due to a nail-influence zone formed in reinforced slope; compression deformation of soil in middle and upper parts of slope is increased and shear deformation of which is decreased, resulting in the strengthening of slope stability. Soil nails in upper parts of reinforced slope has much more significant effects on reinforcing as load increased. Also in middle and lower parts of slope, the interaction between soil and nails becomes intensive near the slope surface.

Key words: crest loading, cohesive slope, centrifuge model tests, soil nails

中图分类号:

TU 443

曹洁，张嘎，王丽萍. 坡顶加载时黏性土坡土钉加固前后的离心模型试验比较研究[J]. , 2011, 32(S1): 364-0369.

CAO Jie, ZHANG Ga, WANG Li-ping. Comparison between unreinforced and soil nail-reinforced cohesive soil slopes under load condition in centrifuge model tests[J]. , 2011, 32(S1): 364-0369.

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