| 两种粉质黏土的动、静强度特性对比研究 |
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| 引用本文： | 黄博,史海栋,凌道盛,陈云敏.两种粉质黏土的动、静强度特性对比研究[J].岩土力学,2012,33(3):665-673. |
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| 作者姓名： | 黄博 史海栋 凌道盛 陈云敏 |
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| 作者单位： | 1. 浙江大学 岩土工程研究所，杭州 310058；2. 浙江大学 软弱土与环境土工教育部重点实验室，杭州 310058 |
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| 基金项目： | 地震行业科研专项(No.200808022);国家自然科学基金资助项目(No.50708095);国家重点基础研究发展计划(No.2007CB714200);国家海洋局第二海洋研究所科研业务费专项基金(JT0803)联合资助 |
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| 摘 要： | 以京津高铁和杭州地铁沿线的两种典型粉质黏土为研究对象，并采用英国GDS多功能三轴仪完成了静、动力强度测试，研究了两种土的静力不排水抗剪强度和在交通荷载高振次循环下的动强度、临界动应力比、应变发展模式以及振后抗剪强度等方面的差异。对比发现，长期循环荷载作用下两种土的应变发展和振后强度均有很大不同。与京津地区粉质黏土相比，杭州地铁沿线土含水率高、孔隙比大、密度低、灵敏度高、强度低。两种原状土在小幅振动后土体强度略有增大，而随振幅增大，振后强度将低于未经历振动时的不排水强度值；而重塑土振后强度均低于静剪强度。
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| 关 键 词： | 交通荷载 动三轴试验 扫描电镜 残余应变 振后抗剪强度 |
| 收稿时间： | 2010-12-07 |
Comparisons of static and dynamic behaviors between two silty clays by test |
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| HUANG Bo
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SHI Hai-dong
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LING Dao-sheng
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CHEN Yun-min.Comparisons of static and dynamic behaviors between two silty clays by test[J].Rock and Soil Mechanics,2012,33(3):665-673. |
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| Authors: | HUANG Bo SHI Hai-dong LING Dao-sheng CHEN Yun-min |
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| Institution: | 1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310058, China |
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| Abstract: | Basic properties and microstructures of two typical silty clays collected along Beijing-Tianjin high-speed railway and Hangzhou metro line are studied.Using triaxial testing apparatus by GDS Company,static tests under consolidated undrained condition and dynamic tests under high cycles for simulating long-term traffic loading are carried out on these two soils.The undrained static strength,dynamic strength,critical dynamic stress ratio,development of accumulated dynamic strain,and shear strength after vibration of both soils have been studied for comparison.It is found that the soil along the Hangzhou metro line is with high water content,low density,large void ratio,which leads to weak strength and high sensitivity compared with those of Beijing-Tianjin’s.After small amplitude cyclic loading,both of the undisturbed specimens behave higher shear strength than that under static condition,while after large amplitude cyclic loading,vice versa.The remolded specimens always show a strength reduction after cyclic loading,no matter the amplitude of dynamic loading. |
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| Keywords: | traffic loading dynamic triaxial test scanning electron microscope residual strain shear strength after dynamic loading |
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