| 钱塘江冲海积粉土剪胀性三轴试验研究 |
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| 引用本文： | 杨迎晓,朱向荣,金兴平,周春平,徐根洪.钱塘江冲海积粉土剪胀性三轴试验研究[J].岩土力学,2010,31(Z2):48-52. |
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| 作者姓名： | 杨迎晓 朱向荣 金兴平 周春平 徐根洪 |
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| 作者单位： | 1. 浙江大学 软弱土与环境土工教育部重点实验室，杭州 310058；2. 浙江树人大学 城建学院、杭州 310015； 3. 杭州市城市建设发展公司，杭州 310001；4. 浙江中材工程勘测设计有限公司，杭州 310022 |
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| 基金项目： | 浙江省科技计划项目（No. 2008C33002）。 |
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| 摘 要： | 钱塘江两岸广泛分布着冲海积粉土.通过大量的三轴固结不排水CU和固结排水CD试验,探讨饱和粉土的应力应变性状和剪胀特性。试验表明,钱塘江冲海积粉土显著的特性之一是在剪切中膨胀,剪胀主要与粉土的密度和围压有关。CU试验中密(e=0.739～0.866)的原状样在围压600kPa范围内剪切膨胀,稍密(e=0.890～0.906)的击实样在围压低于400kPa剪切膨胀。由于粉土膨胀的本质不排水强度在剪切中保持增加,对于这种情况就没有惟一的"不排水强度";CD试验稍密(e=0.889～0.945)的击实样在围压低于400kPa时剪切膨胀。钱塘江冲海积粉土的剪切破坏要经历一个大的变形过程,固结排水剪切过程的应力应变性状可分为4个阶段。取应变继续而没有进一步体积变化的临界状态做破坏标准,确定粉土排水剪切强度指标较合理。
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| 关 键 词： | 粉土 三轴试验 应力应变 体应变 剪胀性 |
| 收稿时间： | 2010-04-28 |
Triaxial testing study of dilatant characteristics of Qiantangjiang alluvial silts |
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| YANG Ying-xiao,ZHU Xiang-rong,JING Xing-ping,ZHOU Chun-ping,XÜ,Gen-hong.Triaxial testing study of dilatant characteristics of Qiantangjiang alluvial silts[J].Rock and Soil Mechanics,2010,31(Z2):48-52. |
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| Authors: | YANG Ying-xiao ZHU Xiang-rong JING Xing-ping ZHOU Chun-ping XÜ Gen-hong |
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| Institution: | 1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 2. School of Urban Construction, Zhejiang Shuren University, Hangzhou 310015, China; 3. Hangzhou Urban Construction and Development Company, Hangzhou 310001, China; 4. Zhejiang Zhongcai Engineering Survey Design Co., Ltd., Hangzhou 310022, China |
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| Abstract: | Silt soils have been encountered in most of the estuary of Qiantangjiang River. Drained and undrained triaxial tests have been made to study the dilatancy of the saturated silts. The test results show that one of the most significant properties of Qiantangjiang silts is their dilatant characteristics in shear. The amount of potential dilatancy is governed mainly by voids ratio and confining pressure. Conclusions from the consolidated-undrained(CU) tests are the undisturbed samples of the medium density tend to dilate during shear in the cell pressures range 600 kPa while the compacted samples of the small density tend to dilate under the cell pressure of less than 400 kPa during shear. Due to their dilatant nature, the undrained strength of many silts keeps increasing during shear, for this case there is no unique “undrained strength”. The compacted samples whose quality has been demonstrated in the consolidated-drained(CD) tests to be slightly dense tend to dilate under the cell pressure of less then 400 kPa during shear. The failure of Qiantangjiang silts usually goes through larger deformations. The stress-strain curve of drained tests can be divided into four stages. It is reasonable that the point where the strain can continue without further change of volume is chosen as a failure criterion to define the drained strength of silt. |
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| Keywords: | silt triaxial test stress-strain volumetric strain dilatancy |
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