球形颗粒紧密堆积状态时的吸力分析

›› 2008, Vol. 29 ›› Issue (11): 2927-2932.

球形颗粒紧密堆积状态时的吸力分析

李顺群^1，2，栾茂田³，赵瑞斌^1，2，王沛^1，2

1. 天津城市建设学院土木工程系，天津 300384；2. 天津市软土特性与工程环境重点实验室，天津 300384； 3. 大连理工大学土木水利学院岩土工程研究所，大连 116024

收稿日期:2007-04-01 出版日期:2008-11-10 发布日期:2013-08-07
作者简介:李顺群，男，1971年生，博士，副教授，主要从事土力学与地基基础方面的教学与研究工作
基金资助:
中国博士后科学基金项目（No.20080430091）；天津市高等学校科技发展基金计划项目（No.20071005）。

Analysis of diverse suctions in compact accumulation model composed of ball-shaped particles

LI Shun-qun^{1, 2}, LUAN Mao-tian³, ZHAO Rui-bin^{1, 2}, WANG Pei^{1, 2}

1. Department of Civil Engineering, Tianjin Institute of Urban Construction, Tianjin 300384, China; 2. Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin 300384, China; 3. Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China

Received:2007-04-01 Online:2008-11-10 Published:2013-08-07

摘要/Abstract

摘要： 根据圆液面假设和热力学基本原理，研究了球形颗粒紧密堆积模式在水封闭状态（状态2）时的吸力特性，得到了状态2中3类吸力和3类等效吸力与饱和度的定量关系和以接触角和饱和度或饱和半径为参数的吸力比表达式。进一步的研究表明，在状态2中吸力比都小于1，与基于松散堆积模式在水封闭状态（状态1）时得到的结果比较后可知，随着颗粒排列密实度的增大，相对于基质吸力，张力吸力的作用将有所降低但仍然不可忽视。另外，随饱和度变化，状态2中的3类吸力，特别是3类等效吸力的变化趋势与基于状态1得到的结论基本一致。在状态2中，对数吸力比与饱和半径呈明显的线性关系，吸力比与饱和度也呈明显的线性关系，前者与状态1中的吸力演化规律一致，而后者则存在较大不同。

关键词: 非饱和土, 紧密堆积, 水封闭, 吸力, 吸力比

Abstract: Based on assumed pendular state of isolated pore water, general thermodynamics theory, numerical and statistical methods, the former analytical procedure proposed in literatures is employed to study diverse suctions in state B, compact accumulation model composed of ball-shaped particles with discontinuous water and continuous air (DWCA) in its void. Development law of the three types of suctions as well as corresponding equivalent suctions with increasing saturation degree, and expression for suction ratio with contact angle and saturation degree or saturation radius as the two parameters are derived for unsaturated material in state B. The results of numerical method show that suction ratio is less than 1 in state B; and that is very different from that in state A, the incompact accumulation model composed of ball-shaped particles with DWCA. Therefore, it can be concluded that effect of tension suction on shear strength and deformation of unsaturated granular materials, usually unsaturated soils, will fall down to a certain extent comparing with that of matric suction with increase of compactness. With change of saturation degree, variation trend of the three types of suctions, especially the three equivalent suctions in state B is basically coincident with that in state A. Both in state B and in state A, logarithmic suction ratio is distinctly linear to saturation radius. Furthermore, relationship between suction ration and saturation degree in state B is linear too; but this is very different from that in state A.

Key words: unsaturated soil, compact accumulation, state of discontinuous water with continuous air, suction, suction ratio

中图分类号:

TU 431

李顺群，栾茂田，赵瑞斌，王沛 . 球形颗粒紧密堆积状态时的吸力分析[J]. , 2008, 29(11): 2927-2932.

LI Shun-qun , LUAN Mao-tian , ZHAO Rui-bin , WANG Pei . Analysis of diverse suctions in compact accumulation model composed of ball-shaped particles[J]. , 2008, 29(11): 2927-2932.

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