| 不同压应力作用下黏土体积变形的微观特征 |
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| 引用本文： | 陈宝,朱嵘,常防震.不同压应力作用下黏土体积变形的微观特征[J].岩土力学,2011,32(Z1):95-99. |
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| 作者姓名： | 陈宝 朱嵘 常防震 |
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| 作者单位： | 同济大学岩土及地下工程教育部重点实验室;上海市宝山区建设和交通委员会;中交上海港湾工程设计研究院有限公司; |
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| 基金项目： | 国家自然科学基金项目资助(No.40802069) |
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| 摘 要： | 为了研究黏土体积变形的微观结构变化特征,选取上海第4层淤泥质黏土为研究对象,分别采用各向等压和K0压缩两种方法制备体积变化率相同的土样,经冷冻真空干燥后对土样进行压汞试验并测定土中孔隙大小分布状况。压汞试验结果表明:试验黏土中孔隙可分为大孔隙、中孔隙、小孔隙和微孔隙,小孔隙占据土中孔隙的大部分空间,且其变化能够反映微观结构的主要特性;在各向等压应力状态下,随着压应力增高、体积压缩量增大,黏土颗粒发生空间平移使颗粒间变得更为紧密,孔隙分布曲线变化以孔隙波峰往孔隙变小方向偏移为主要特征,孔隙尺寸变小而孔隙形态基本不变;在K0压缩应力状态下,随着压应力增高,黏土颗粒发生旋转使孔隙变得扁平,表现为孔隙波峰位置基本不发生偏移,而以峰值降低为主要特征,孔隙结构形态明显改变。
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| 关 键 词： | 黏土 体积变形 压应力 孔隙分布 微观结构 |
| 收稿时间： | 2011-02-18 |
Microstructural characteristics of volumetric deformation of clay under different compression stresses |
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| CHEN Bao,ZHU Rong,CHANG Fang-zhen.Microstructural characteristics of volumetric deformation of clay under different compression stresses[J].Rock and Soil Mechanics,2011,32(Z1):95-99. |
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| Authors: | CHEN Bao ZHU Rong CHANG Fang-zhen |
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| Affiliation: | 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Committee of Construction and Communications, Baoshan District, Shanghai 201900, China; 3. CCCC Shanghai Harbour Engineering Design & Research Institute Co., Ltd., Shanghai 200032, China |
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| Abstract: | With the soft clay samples of the 4th soil layer in Shanghai prepared by isotropic compression and K0 compression respectively,some mercury intrusion porosimetry(MIP) tests were carried out to investigate the microstructural characteristics of the volumetric deformation of clay under different compression stresses.By analyzing and comparing the pore size distribution curves(PSDC) obtained from MIP tests,some conclusions are drawn as follows.The pores in tested clay can be divided into macropore,mesopore,fin... |
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| Keywords: | clay volumetric deformation compression stresses pore size distribution microstructure |
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