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工程科学与技术:2010,42(2):64-68
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土工格栅加筋膨胀土的固结排水剪特性
(1.中国水电顾问集团 华东勘测设计研究院,浙江 杭州 310014;2.长江科学院 水利部岩土力学与工程重点实验室,湖北 武汉 430010;3.长江科学院 水利部岩土力学与工程重点实验室;4.中铁西南科学研究院有限公司)
Consolidation and Drain Shear Test for Expansive Soils Reinforced with Geogrids
(1.Hydro China Huadong Eng. Co., Hangzhou 310014,China;2.Key Lab. of Geotechnical Mechanics and Eng. of the Ministry of Water Resources,Yangtze River Scientific Research Inst., Wuhan 430010,China;3.Key Lab. of Geotechnical Mechanics and Eng. of the Ministry of Water Resources,Yangtze River Scientific Research Inst.;4.China Railway Southwest Research Inst. Co. Ltd)
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投稿时间:2008-12-01    修订日期:2009-05-17
中文摘要: 以南水北调中线新乡渠段的膨胀性泥灰岩风化土为填料,聚酯(PET)双向土工格栅为筋材,对不同围压下未加筋及不同层数加筋的压实膨胀土进行了三轴固结排水剪试验。试验结果表明,其应力应变曲线均呈应变硬化型,加筋土的硬化程度提高,总体上符合Duncan-Chang非线弹性模型的双曲线关系;加筋土的初始屈服应力及峰值强度提高,且随加筋层数增多,其提高幅度增大;围压较大时,初始屈服的应力与应变较大,峰值强度较大;但随围压增大,加筋土峰值强度提高的幅度减小;加筋土的粘聚力有较大提高,但提高幅度与加筋层数的关系不显著;加筋土的内摩擦角也有不同程度提高,其提高幅度随加筋层数增多而增大。
Abstract:A PET biaxial geogrid is adopted to reinforce the weathered expansive marlite in XinXiang,the midline of South to North Water Transfer Project (SNWT) in China.The saturated samples of reinforced expansive soils with the size of Φ101 mm×200 mm are adopted to carry out a series consolidation and drain (CD) shear test in different confining pressure. Results shows that, the unreinforced and reinforced expansive soils are strain hardening, and curves of stress vs strain are in accord with the Duncan Chang nonlinear elastic model.The initial yield stress, the corresponding strain,and the strength of reinforced soils are enhanced,and the increase quantity is bigger with more layers of reinforced geogrid.With more confining pressure,the initial yield stress,the corresponding strain,and the strength of reinforced soils are also increased. Compared with the unreinforced expansive soils,the adhesion and friction angle of reinforced soils are both heightened.
文章编号:200800639     中图分类号:    文献标志码:
基金项目:国家“十一五”科技支撑计划重大资助项目(2006BAB04A10)
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汪明元,于嫣华,李齐仁.土工格栅加筋膨胀土的固结排水剪特性[J].工程科学与技术,2010,42(2):64-68.
Wang Ming Yuan,Yu Yanhua,Li Qiren.Consolidation and Drain Shear Test for Expansive Soils Reinforced with Geogrids[J].Advanced Engineering Sciences,2010,42(2):64-68.