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[1]于佳静,陈东霞*,王 晖,等.干湿循环下花岗岩残积土抗剪强度及边坡稳定性分析[J].厦门大学学报(自然科学版),2019,58(04):614-620.[doi:10.6043/j.issn.0438-0479.201902003]
 YU Jiajing,CHEN Dongxia*,WANG Hui,et al.Analysis of the shear strength of granite residual soil and slope stability under wetting-drying cycles[J].Journal of Xiamen University(Natural Science),2019,58(04):614-620.[doi:10.6043/j.issn.0438-0479.201902003]
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《厦门大学学报(自然科学版)》[ISSN:0438-0479/CN:35-1070/N]

卷:
58卷
期数:
2019年04期
页码:
614-620
栏目:
研究论文
出版日期:
2019-07-28

文章信息/Info

Title:
Analysis of the shear strength of granite residual soil and slope stability under wetting-drying cycles
文章编号:
0438-0479(2019)04-0614-07
作者:
于佳静1陈东霞12*王 晖3张 波1
1.厦门大学建筑与土木工程学院,福建 厦门 361005; 2.厦门市交通基础设施智能管养工程技术研究中心,福建 厦门 361005; 3.四川都江堰市经济开发区管委会,四川 都江堰 611830
Author(s):
YU Jiajing1CHEN Dongxia12*WANG Hui3ZHANG Bo1
1.School of Architecture and Civil Engineering,Xiamen University,Xiamen 361005,China; 2.Xiamen Engineering Technology Center for Intelligent Maintenance of Infrastructure,Xiamen 361005,China; 3.Administrative Committee of Dujiangyan Economic Development
关键词:
干湿循环 花岗岩残积土 强度参数 边坡稳定性 安全系数
Keywords:
wetting-drying cycles granite residual soil strength parameters slope stability safety factor
分类号:
TU 443
DOI:
10.6043/j.issn.0438-0479.201902003
文献标志码:
A
摘要:
为研究干湿循环对花岗岩残积土抗剪强度特性和抗剪强度参数的影响,分析花岗岩残积土边坡的稳定性,改进了常规的单元试验方法.以整个花岗岩残积土边坡为试验对象进行干湿循环模拟,在每次循环后直接在边坡坡面上切取花岗岩残积土试样进行直剪试验.在此基础上,利用有限元软件ABAQUS对一实际边坡进行了干湿循环的数值模拟,在每次循环模拟前对上一次模拟结果进行分析,将等效塑性应变较大区域的土体强度进行适当折减,分析每次循环后花岗岩残积土边坡的应力应变、稳定性以及塑性变形.试验结果表明:花岗岩残积土的抗剪强度随干湿循环次数、循环幅度的增加而减小,其中黏聚力值衰减明显,内摩擦角的变化相对较小,在3~5次干湿循环后抗剪强度趋于稳定; 通过数据分析得到干湿循环的黏聚力公式,进一步得到了干湿循环条件下花岗岩残积土的抗剪强度公式; 干湿循环作用导致边坡稳定性降低,安全系数减小,且第一次干湿循环后安全系数的降幅最大.
Abstract:
In order to study the shear strength parameters and characteristics of granite residual soil and stability of slope under wetting-drying cycles,wetting-drying cycles were simulated on the whole granite residual soil slope,instead of the conventional unit test method.After each cycle,direct shear tests on the soil samples fetched from the slope surface were performed.On this basis,wetting-drying cycles were simulated on an actual slope by the finite element software ABAQUS to analyze the stress,strain,stability and plastic deformation of granite residual soil slope under wetting-drying cycles.The last simulation results were analyzed before each cycle simulation and the strength of soils which had large plastic strain was reduced properly.The results showed that the shear strength of granite residual soil decreases with the increase of the number and amplitude of wetting-drying cycles,in which the cohesion decreases obviously and the friction angle changes relatively little.The shear strength is about to stable after third to fifth times of cycles.The cohesion formula and shear strength formula of granite residual soil under wetting-drying cycles are obtained based on the data analysis.Wetting-drying cycles lead to the decrease of slope stability and safety factor,and the decline is the largest after the first cycle.

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备注/Memo

备注/Memo:
收稿日期:2019-02-11录用日期:2019-03-17
基金项目:厦门市交通基础设施智能管养工程技术研究中心开放基金(TCIMI201804)
*通信作者:dongxiachen@xmu.edu.cn
更新日期/Last Update: 1900-01-01