| 土工格栅加筋砂土地基大模型动载试验研究 |
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| 引用本文： | 王家全,张亮亮,刘政权,周圆兀.土工格栅加筋砂土地基大模型动载试验研究[J].岩土力学,2018,39(10):3539-3547. |
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| 作者姓名： | 王家全 张亮亮 刘政权 周圆兀 |
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| 作者单位： | 广西科技大学 土木建筑工程学院，广西 柳州 545006 |
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| 基金项目： | 国家自然科学基金项目(No. 51469005)；广西自然科学基金项目(No. 2015GXNSFAA139257，No. 2015GXNSFAA139270，No. 2017GXNSFAA198170)；广西科技大学研究生教育创新计划项目(No. GKYC201627)。 |
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| 摘 要： | 为了研究土工格栅加筋砂土地基在动力荷载作用下的受力变形特性，利用自行设计的300 cm×160 cm×200 cm（长×宽×高）大比例地基模型试验装置，分别针对纯砂地基、土工格栅加筋地基进行了静动荷载破坏试验。分析地基承载力及基础沉降、地基土压力、动力加速度响应、土工格栅应变等参数变化规律，揭示了动力荷载作用下加筋砂土地基的承载力和变形特征，并对比分析静、动荷载对加筋地基承载性能的影响。试验结果表明，与纯砂地基相比，格栅单层加筋地基的承载力提高1.12倍，地基基础中轴线处沉降量减少24%，加筋土体的抗变形能力得到很大提高；加筋作用改变了地基的破坏模式，动载作用下纯砂地基为冲剪破坏而加筋地基为整体剪切破坏；筋材的存在对地基土压力及加速度峰值分别有明显的扩散作用和衰减作用，可有效降低在动力载荷下筋土的瞬态变形。
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| 关 键 词： | 土工格栅 加筋地基 界面作用 承载特性 动载试验 |
| 收稿时间： | 2017-03-25 |
Large model test on geogrid reinforced sand soil foundation under dynamic loading |
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| WANG Jia-quan,ZHANG Liang-liang,LIU Zheng-quan,ZHOU Yuan-wu.Large model test on geogrid reinforced sand soil foundation under dynamic loading[J].Rock and Soil Mechanics,2018,39(10):3539-3547. |
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| Authors: | WANG Jia-quan ZHANG Liang-liang LIU Zheng-quan ZHOU Yuan-wu |
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| Institution: | College of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou, Guangxi 545006, China |
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| Abstract: | To investigate the bearing performance and deformation characteristics of geogrid-reinforced sand soil foundation under the action of dynamic loading, the static and dynamic load failure tests on the pure-sand foundation and geogrid-reinforced foundation were carried by using a self-designed large scale foundation model test device of 300 cm (length)×160 cm (width)×200 cm (height). The variation laws of foundation bearing capacity, foundation settlement, foundation soil pressure, dynamic acceleration response and geogrid strain were analyzed. The bearing capacity and deformation characteristics of reinforced sand foundation under dynamic load were revealed, and the influence of static and dynamic loads on the bearing capacity of reinforced foundation was compared and analyzed. The results showed that the bearing capacity of the monolayer reinforced foundation was improved by 1.12 times as compared with the pure-sand foundation, and the axis settlement of the foundation was reduced by 24%. Moreover, the anti-deformation ability of reinforced-foundation soil was significantly improved compared with pure-sand foundation. The reinforcement changed the failure mode of the foundation, the failure mode of pure-sand foundation was the punching-shear failure, whereas reinforced foundation was whole shear failure under dynamic loading. The existence of the reinforcement had obvious diffusion and attenuation effect on earth pressure and the acceleration peak respectively, which could effectively reduce the transient deformation of the reinforced-soil under dynamic loading. |
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| Keywords: | geogrid reinforced foundation interface interaction bearing characteristic dynamic loading test |
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