加筋垫层对软土路基加固效果的多方案比较
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摘要
为了更好地将土工合成材料加筋垫层应用于不同软土路基加固方案中,通过有限元数值计算程序建立了复合地基分析模型,并根据现场试验结果验证了其合理性;对比分析了不加固处理、仅加筋垫层处理、复合地基、加筋垫层联合复合地基4种不同加固方案作用下地基的潜在滑移面、稳定安全系数、水平位移、沉降和桩土应力比的变化规律。研究结果表明,对比不同的加固方案,加筋垫层的应力扩散作用和筋土之间的摩擦作用,能够限制地基土的侧向变形,有效提高路堤的整体稳定性,减小路基的沉降和桩土差异沉降,充分发挥桩的强度和刚度。
In order to apply geosynthetic reinforced cushion to different reinforcement schemes of road soft soil subgrade. The composite subgrade model was established by finite element numerical software and its rationality was verified by monitoring results obtained from field tests. The characteristics of potential slip surface, stability safety coefficient, horizontal displacement, settlement and pile-soil stress ratio of four kinds of subgrade without any treatment, treated with reinforced cushion only, composite foundation and treated with reinforced cushion combined composite foundation were analyzed comparatively. The results demonstrate that the stress diffusion and friction effects caused by reinforced cushion are able to constrain the lateral deformation of foundation, improve the overall stability of the embankment effectively, reduce the settlement of subgrade as well as between column and soil, exert the stiffness and strength of stone column fully.
In order to apply geosynthetic reinforced cushion to different reinforcement schemes of road soft soil subgrade. The composite subgrade model was established by finite element numerical software and its rationality was verified by monitoring results obtained from field tests. The characteristics of potential slip surface, stability safety coefficient, horizontal displacement, settlement and pile-soil stress ratio of four kinds of subgrade without any treatment, treated with reinforced cushion only, composite foundation and treated with reinforced cushion combined composite foundation were analyzed comparatively. The results demonstrate that the stress diffusion and friction effects caused by reinforced cushion are able to constrain the lateral deformation of foundation, improve the overall stability of the embankment effectively, reduce the settlement of subgrade as well as between column and soil, exert the stiffness and strength of stone column fully.
引文
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[15] 董博文,邹德高,周晨光,等.堆石料与土工格栅间拉拔特性试验研究[J].水利与建筑工程学报,2016,14(4):50-54.
[16] 李兴庆,李桂林,周荭,等.云南山间盆地软土成因及其工程特性[J].西部探矿工程,2016(1):5-8.
[2] 王亚涛,何杰,汤磊华,等.土工格栅加筋垫层工作特性分析[J].湖南工业大学学报,2015,29(4):15-19.
[3] 邵国霞,苏谦,尹紫红,等.不同垫层下管桩复合地基现场对比试验研究[J].西南交通大学学报,2018,53(2):279-285.
[4] 贺炜,李昆,王芳洪.防岩溶塌陷加筋垫层大比例模型试验及设计理论研究[J].岩石力学与工程学报,2016,35(5):980-988.
[5] 贺炜,李昆,王芳洪,等.路基岩溶塌陷上方多层加筋垫层荷载分布的大比例模型实验研究[J].水文地质工程地质,2016,43(1):79-84.
[6] 马龙.路基岩溶塌陷上方多层加筋垫层加固机制及荷载分担系数研究[D].长沙:长沙理工大学,2015:1-84.
[7] 刘开富,许家培,曹玲珑.刚柔性桩加筋垫层复合地基承载性状数值分析[J].浙江理工大学学报(自然科学版),2018,39(3):372-377.
[8] 何杰,孟森松,饶迁根,等.软土地基上加筋碎石垫层工作性状试验研究[J].湖南工业大学学报,2014,28(5):17-21.
[9] 师哥.软土地基土工格栅加筋垫层效果影响因素分析[J].山西建筑,2014,40(14):83-84.
[10] 李磊.基于实测数据的新旧高路堤加筋影响研究[J].水利与建筑工程学报,2016,14(3):172-176.
[11] 王超,甘先永,张文杰,等.软基路堤加筋垫层与竖向加固桩作用模式数值分析[J].公路与汽运,2018(5):87-90.
[12] 王勇,蔡智,屈洋,等.CFG桩复合地基加筋褥垫层作用机理数值分析[J].水利与建筑工程学报,2016,14(1):96-100.
[13] 赵宇,石名磊,张浩.疏桩路基中基底垫层设置效应分析[J].公路交通科技,2015,32(4):52-58.
[14] 上官士青,杨敏,陈飞,等.基于最小势能原理的加筋垫层与路堤桩土相互作用研究[J].岩土工程学报,2015,37(7):1264-1270.
[15] 董博文,邹德高,周晨光,等.堆石料与土工格栅间拉拔特性试验研究[J].水利与建筑工程学报,2016,14(4):50-54.
[16] 李兴庆,李桂林,周荭,等.云南山间盆地软土成因及其工程特性[J].西部探矿工程,2016(1):5-8.