考虑块石长轴倾角和土石接触面的土石混合体边坡稳定性研究
The stability analysis of the soil-rock slope considering long axis inclination and soil-rock interface
作者:黄献文(安徽理工大学 土木建筑学院);姚直书(安徽理工大学 土木建筑学院);王伟(绍兴文理学院 土木工程系);周爱兆(江苏科技大学 土木工程与建筑学院);姜朋明(江苏科技大学 土木工程与建筑学院)
Author:HUANG Xian-wen(School of Architecture and Civil Engineering,Anhui University of Science and Technology,Huainan Anhui);YAO Zhi-shu(School of Architecture and Civil Engineering,Anhui University of Science and Technology,Huainan Anhui);Wang Wei(School of Architecture and Civil Engineering,Shaoxing University,Shaoxing Zhejiang);ZHOU Ai-zhao(School of Architecture and Civil Engineering,Jiangsu University of Science and Technology,Zhenjiang Jiangsu);Jiang Peng-ming(School of Architecture and Civil Engineering,Jiangsu University of Science and Technology,Zhenjiang Jiangsu)
收稿日期:2020-03-28 年卷(期)页码:2020,52(6):-
期刊名称:工程科学与技术
Journal Name:Advanced Engineering Sciences
关键字:土石混合体边坡;极限分析;随机块石模型;块石掺量;长轴倾角;土石接触面
Key words:soil-rock slope; limit analysis; stochastic rock models; rock content; long-axis inclination; soil-rock contesting surface
基金项目:国家自然科学基金(No.51674006,No.51309121,No.51678300),安徽省大学学科(专业)顶尖人才资助项目(gxbjZD09),安徽省自然科学研究院资助研究重点项目(KJ2018A0098),安徽理工大学青年教师科研基金(QN2017211)
中文摘要
为准确分析土石混合体边坡稳定性,提出了一种基于原始块石形状库的随机土石混合体边坡模型构建方法,该方法可以很好的考虑块石形状和分布特征。采用该方法和有限元极限分析软件Optum G2,结合土石混合体边坡物理模型试验,研究了块石掺量(0%~50%)、长轴倾角(0°~180°)和土石接触面强度(1.4~0.01)对土石混合体边坡稳定性的影响。结果表明,块石在边坡剪切带存在“绕行”、“分流”、“包含”三种塑性扩展模式,并通过改变边坡剪切带的曲折点、长度和发展方向影响边坡稳定;通过对不同块石掺量下边坡稳定性研究,发现当块石掺量大于20%时,块石分布对边坡稳定性的影响较大;在高块石掺量下,边坡容易出现“局部”或“崩解式”破坏;在相同块石掺量下,块石长轴倾角平行或垂直于边坡剪切带时,边坡分别获得最小或最大安全系数;当块石长轴垂直于边坡剪切带时,边坡容易出现“崩解式”破坏,这主要与块石长轴对于边坡剪切带发展的“诱导”效应有关;在相同块石分布模型下,边坡安全系数随土石接触面系数的减小而降低,甚至会低于均质土边坡;当土石接触面强度低于土体强度时,块石对边坡剪切带存在 “吸引”效应。研究结果可为土石混合体边坡稳定性的评估和治理提供参考。
英文摘要
In order to accurately analyze the stability of soil-rock slopes, based on the original rock shape library, a random soil-rock slope model establishing method was proposed. This method could consider the shape and distribution characteristics of rocks very well. Using this method, finite element limit analysis software Optum G2, combined with physical models, the stability of soil-rock slope considering different rock contents (0%~50%), long axis inclinations (0°~180°) and soil-rock contacting surface (1.4~0.01) were studied. The results showed that the influence of rocks on the shear zone of the slope included three development modes: “bypass”, “diversion” and “include”, which lead to the change of bending point, length and developing direction of the shear zone. Through the study on the stability of slope with different rock contents, it was found that when rock content was more than 20%, the influence of rock distribution on the stability of slope was greater, and the slope with high rock content was prone to "local" or "disintegrating" failure. At the same rock content, the minimum (or maximum) safety factor was obtained when the long axial inclinations of rocks was parallel or (vertical) to the shear zone of the slope. When the rock long axis was vertical to the shear zone of the slope, the slope was prone to "disintegration" failure, which was mainly related to the "induced" effect of the rock long axis on the shear zone of the slope. Under the same rock distribution model, the slope safety factor decreased with the decrease of the soil-rock contacting surface coefficient, and when soil-rock contacting surface strength was lower than the soil, the "attraction" effect of rocks to development of the shear zone would appeared. The research results could provide a reference for the stability analysis and treatment of soil-rock slopes.
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