锚杆框架梁支护膨胀土路堑高边坡稳定性分析
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摘要
以江西万载至宜春高速公路某膨胀土路堑3级高边坡为研究对象,利用有限差分方法对锚杆框架梁支护结构与坡体共同作用下的边坡稳定性进行了三维数值计算,分析了不同坡级锚杆参数对路堑高边坡变形和安全系数的影响规律。结果表明,边坡安全系数并不是随锚杆长度的增加而持续增加,而是存在一峰值,锚杆布设角度对边坡安全系数影响较小,而对边坡变形有显著影响,不同坡率的各级边坡存在最优锚固角。
Taking the three-level expansive soil roadcut slope of Wanzai-Yichun Freeway in Jiangxi Province as the research object,we use the finite difference method to carry the three-dimensional numerical calculation of slope stability under the action of anchor frame beam supporting structure and the slope.The anchor parameters of the different level slope influence on the safety factor and deformation of high roadcut slope are analyzed.The results show that the slope safety factor does not increase with the increase of anchor length,and it has a peak; that the influence of anchor setting angle of the slope on the safety factor is small,but it has significant effect on the slope deformation.The optimal anchor angle is different,as the rate of the three levels slope is different.
Taking the three-level expansive soil roadcut slope of Wanzai-Yichun Freeway in Jiangxi Province as the research object,we use the finite difference method to carry the three-dimensional numerical calculation of slope stability under the action of anchor frame beam supporting structure and the slope.The anchor parameters of the different level slope influence on the safety factor and deformation of high roadcut slope are analyzed.The results show that the slope safety factor does not increase with the increase of anchor length,and it has a peak; that the influence of anchor setting angle of the slope on the safety factor is small,but it has significant effect on the slope deformation.The optimal anchor angle is different,as the rate of the three levels slope is different.
引文
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[11]韩爱民,李建国,肖军华,等.预应力锚杆框架梁的支护力学行为研究[J].岩土力学,2010,31(9):2894-2900.
[12]周勇,张鹤,方嗣茂.框架预应力锚杆分级支护边坡的数值模拟研究[J].建筑科学,2013,29(5):11-14.
[13]朱彦鹏,王立文.边坡分级柔性支护数值模拟研究[J].建筑科学与工程学报,2012,29(4):25-31.
[14]曹兴松,肖世国,何洪,等.高边坡多级锚杆框架上坡体压力模型试验[J].地下空间与工程学报,2015,11(5):1159-1163.
[15]吴文清,张鸿,张红宇,等.框格梁锚杆加固膨胀土路堑边坡数值模拟及设计优化[J].路基工程,2014(4):58-60.
[16]徐彬,殷宗泽,刘述丽.膨胀土强度影响因素与规律的试验研究[J].岩土力学,2011,32(01):44-50.
[2]滕珂,杨果林,易岳林.膨胀土路堑柔性护坡整体稳定性计算方法[J].中南大学学报:自然科学版,2015(10):3907-3913.
[3]向远华.锚杆框架梁—双排抗滑桩支护膨胀土边坡工作特性分析[J].铁道科学与工程学报,2013,10(3):62-67.
[4]周宏元,曾智勇.预应力锚杆框架梁边坡加固结构的应用分析[J].铁道工程学报,2013(3):16-18.
[5]Abbas M F,Elkady T Y,Al-Shamrani M A.Evaluation of Strain and Stress States of a Compacted Highly Expansive Soil using a Thin-walled Oedometer[J].Engineering Geology,2015,193(5):132-145.
[6]Nam S,Gutierrez M,Diplas P,et al.Determination of the Shear Strength of Unsaturated Soils Using the Multistage Direct Shear Test[J].Engineering Geology,2011,122(3):272-280.
[7]高英志.锚杆框架梁加固路堑边坡的设计优化及数值模拟[J].中外公路,2010,30(3):60-62.
[8]张永防,王秉勇.用锚杆框架护坡加固南昆线膨胀土边坡的研究[J].铁道工程学报,2000(3):92-95.
[9]黄龙波,汪洪星,谈云志,等.降雨对岩土边坡稳定影响的实例分析[J].三峡大学学报:自然科学版,2016,38(4):40-45.
[10]吴礼舟,黄润秋.锚杆框架梁加固膨胀土边坡的数值模拟及优化[J].岩土力学,2006,27(4):605-608.
[11]韩爱民,李建国,肖军华,等.预应力锚杆框架梁的支护力学行为研究[J].岩土力学,2010,31(9):2894-2900.
[12]周勇,张鹤,方嗣茂.框架预应力锚杆分级支护边坡的数值模拟研究[J].建筑科学,2013,29(5):11-14.
[13]朱彦鹏,王立文.边坡分级柔性支护数值模拟研究[J].建筑科学与工程学报,2012,29(4):25-31.
[14]曹兴松,肖世国,何洪,等.高边坡多级锚杆框架上坡体压力模型试验[J].地下空间与工程学报,2015,11(5):1159-1163.
[15]吴文清,张鸿,张红宇,等.框格梁锚杆加固膨胀土路堑边坡数值模拟及设计优化[J].路基工程,2014(4):58-60.
[16]徐彬,殷宗泽,刘述丽.膨胀土强度影响因素与规律的试验研究[J].岩土力学,2011,32(01):44-50.