| 水平-竖向加筋饱和砂土动弹性模量试验研究 |
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| 引用本文： | 邱成春,张孟喜.水平-竖向加筋饱和砂土动弹性模量试验研究[J].岩土力学,2012,33(6):1667-1672. |
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| 作者姓名： | 邱成春 张孟喜 |
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| 作者单位： | 上海大学 土木工程系，上海 200072 |
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| 基金项目： | 国家自然科学基金项目(No.40972192);上海市教育委员会科研创新项目(No.11ZZ88) |
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| 摘 要： | 利用美国GCTS公司研制的USTX-2000全自动非饱和土/饱和土动三轴仪，在不同围压下对以有机玻璃作加筋材料的H-V加筋饱和砂土进行了一系列循环荷载下动三轴试验，研究了H-V加筋饱和砂动弹性模量及阻尼比随围压、动应变、竖筋高度的变化规律，从而得到最大动弹性模量与围压的关系。试验表明，纯砂和加筋砂的动弹性模量都随动弹性应变幅的增大而减小，随围压的增大而增大，且H-V加筋砂较纯砂和水平加筋砂有效地增大了动弹性模量，并随着竖筋高度增加而增大；纯砂和加筋砂的最大动弹性模量随着围压的增大而增大，且H-V加筋随竖筋高度增加而增大；纯砂和加筋砂的阻尼比随动弹性应变幅的增大而增大，纯砂和H-V加筋砂的阻尼比随围压的变化不够显著，但有减小的趋势，H-V加筋砂阻尼比随竖筋高度的变化不明显，但加筋砂比纯砂有效地减小了阻尼比。
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| 关 键 词： | 水平-竖向(H-V)加筋 动弹性模量 阻尼比 竖筋高度 |
| 收稿时间： | 2011-01-05 |
Test research on dynamic elastic modulus of saturated sand reinforced with horizontal-vertical inclusions |
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| QIU Cheng-chun
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ZHANG Meng-xi.Test research on dynamic elastic modulus of saturated sand reinforced with horizontal-vertical inclusions[J].Rock and Soil Mechanics,2012,33(6):1667-1672. |
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| Authors: | QIU Cheng-chun ZHANG Meng-xi |
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| Institution: | Department of Civil Engineering, Shanghai University, Shanghai 200072, China |
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| Abstract: | With USTX-2000 automatic unsaturated and saturated dynamic triaxial testing system developed by GCTS(Geotechnical Consulting and Testing Systems) company,a series of dynamic triaxial tests under cyclic loadings are performed on saturated sand reinforced with horizontal-vertical(H-V) inclusions of perspex with different confining pressures.The results of dynamic elastic modulus of saturated sand reinforced with H-V inclusions influenced by confining pressure,dynamic elastic strain and the height of vertical reinforcement are studied.Then,the relations between the maximum dynamic elastic modulus which is useful for practical engineering and confining pressure are gained.It is found that the dynamic elastic moduli of both unreinforced sand and reinforced sand decrease with the increment of dynamic elastic strain,and increase with the confining pressure increase;H-V inclusions reinforced sand improves the dynamic elastic modulus along with the increase of the height of vertical inclusion compared to unreinforced sand and conventional reinforced sand with horizontal inclusions.The maximum dynamic elastic moduli of both unreinforced sand and reinforced sand increase with the increase of confining pressure.The damping ratios of both unreinforced sand and reinforced sand increase with the increase of dynamic elastic strain.Neither the damping ratio of unreinforced sand nor that of reinforced sand is sensitive to the change of confining pressure;however,it has the tendency to decrease as the accretion of confining pressure.In addition,the damping ratio of reinforced sand is obviously decreased compared to that of unreinforced sand. |
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| Keywords: | horizontal-vertical(H-V) reinforcement dynamic elastic modulus damping ratio height of vertical reinforcement |
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