[1]段晓梦,邵龙潭.固态水膜对土中力链传递的影响机理[J].西安建筑科技大学学报(自然科学版),2019,(06):905-908,924.[doi:10.15986/j.1006-7930.2019.06.019]
 DUAN Xiaomeng,SHAO Longtan.The effectmechanisms of solid water layer on the force chains in soils[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2019,(06):905-908,924.[doi:10.15986/j.1006-7930.2019.06.019]
点击复制

固态水膜对土中力链传递的影响机理()
分享到:

西安建筑科技大学学报(自然科学版)[ISSN:1006-7930/CN:61-1295/TU]

卷:
期数:
2019年06期
页码:
905-908,924
栏目:
出版日期:
2019-12-31

文章信息/Info

Title:
The effectmechanisms of solid water layer on the force chains in soils
文章编号:
1006-7930(2019)06-0905-04
作者:
段晓梦12邵龙潭12
(1. 大连理工大学 大连工业装备结构分析国家重点实验室,辽宁 大连 116023;2.大连理工大学 工程力学系,辽宁 大连 116023)
Author(s):
DUAN Xiaomeng12 SHAO Longtan12
(1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, China; 2. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116023, China)
关键词:
吸附水固态水力链水化力粒间力摩擦
Keywords:
adsorbed water solid water force chain hydration force inter-particle force friction
分类号:
TU973.2
DOI:
10.15986/j.1006-7930.2019.06.019
文献标志码:
A
摘要:
土骨架所承担的荷载是经由力链传递的.当颗粒直接接触时,力链中的荷载直接由粒间作用力而传播.但对于具有吸附性的岩土材料,则应审慎考虑土水相互作用对土骨架承载机理的影响.通过总结土中吸附水的性质,将具有类固态性质的吸附水定义为固态水,明确了固态水膜所引起的水化力的定义及其作用机理,进而详细分析了土中力链的传递机理:当颗粒被固态水膜所包裹时,力链构型为“颗粒固态水颗粒”形式,此时颗粒并非直接接触,因而力链中的荷载是经由固态水膜所提供的水化力在粒间传递的;若荷载足够大且边界约束严格,则可将粒间固态水膜完全挤出以实现颗粒直接接触,此时力链构型为“颗粒颗粒”形式,力链中的荷载即由实际粒间接触压力来传递.若土的吸附能力较强且含水量较高,虽然整个加载过程中力链会不断变化与重构,且伴随部分粒间吸附水的挤出,但当颗粒接触点在力链重构中分开时,原本被挤出的粒间固态水膜会迅速恢复,进而继续影响力链的后续变形与重构.考虑到固态水膜的润滑作用,显然该作用机理是土体湿摩擦强度始终低于干摩擦强度的原因之一.
Abstract:
The load carried by the soil skeleton is transmitted in soils by force chains. If particles contact each other directly, the load in force chains is transmitted via inter-particle pressure among soil particles. However, for the adsorptive geomaterials, the solid-water interactions should be taken into account when analyzing the bearing mechanisms. In this work, after reviewing the properties of adsorbed water, the part of it which acts as semi-solid is defined as solid water, and then the definition of hydration force due to solid water and its effects on inter-particle force are illustrated. After that, the force chains in soils are analyzed considering the existence of solid water layer: if particles are wrapped by solid water layer, the force chains are in the form of “particle-solid water-particle”, so particles are indirectly contacted and load is transmitted via hydration force; If the load is large enough and the confinement is rigid enough, the inter-particle solid water could be extruded to realize the direct inter-particle contact, so the force chains are in the form of “particle-particle” and the load is transmitted via real inter-particle pressure. If a soil is strong adsorptive with higher saturation degree, although some inter-particle solid water could be extruded in the process of changing and reforming of force chains, it will recover immediately after the contact points are separated, which could affect the reforming of force chains during the whole loading process. Considering the lubrication due to solid water, it is obvious that the existence of solid water layer in force chains is a key reason to make the wet friction strength always lower that the dry friction strength.

参考文献/References:

[1]段晓梦,曾立峰. 非饱和土的承载结构与岩土广义结构性[J]. 岩土力学, 2018, 39(9): 3103-3112.
DUAN Xiaomeng, ZENG Lifeng. Bearing structure of unsaturated soil and generalized structural properties[J]. Rock and Soil Mechanics, 2018, 39(9): 3103-3112.
[2]孙其诚,金峰. 颗粒物质的多尺度结构及其研究框架[J]. 物理, 2009, 38(4): 225-232.
SUN Qicheng, JIN Feng. The multiscale structure of granular matter and its mechanics[J]. Physics, 2009, 38(4): 225-232.
[3]孙其诚,金峰,王光谦. 密集颗粒物质的多尺度结构[J]. 力学与实践, 2010, 32(1): 10-15.
SUN Qicheng, JIN Feng, WANG Guangqian The multiscale structure of dense granular matter[J]. Mechanics in Engineering, 2010, 32(1): 10-15.
[4]OSIPOV V I. Nanofilms of adsorbed water in clay: mechanism of formation and properties[J]. Water Resources, 2012, 39(7): 709-721.
[5]MARTIN R T. Adsorbed water on clay: a review[Z]. 196228.70.
[6]MITCHELL J K, SOGA K. Fundamentals of Soil Behavior[M]. 3rd. ed. Hoboken:John Wiley & Sons, 2005.
[7]SHAO L, ZHENG G, GUO X, et al. Principle of effective stress for unsaturated soils[C]// Conference 6th Interna Conference on Unsaturated Soils(UnSAT 2014), Sydney: Taylor & Francis, 2014.
[8]SHAO L, GUO X, LIU S, et al. Effective stress and equilibrium equation for soil mechanics[M]. London: CRC Press, 2018.
[9]ZHANG Z, CHENG X. Effective stress in saturated soil: a granular solid hydrodynamics approach[J]. Granular Matter, 2014, 16(5): 761-769.
[10]LEIKIN S, PARSEGIAN V A, RAU D C, et al. Hydration forces[J]. Annual Review of Physical Chemistry, 1993, 44: 369-395.
[11]WANG Q Jane, CHUNG Yip-wah. Encyclopedia of Tribol-ogy[M]. Boston, MA:Springer, 2013.
[12]DHOPATKAR N, DEFANTE A P, DHINOJWALA A. Ice-like water supports hydration forces and eases sliding friction[J]. Science Advances, 2016, 2(8):1-9.
[13]ISRAELACHVILI J N, PASHLEY R M. Molecular layering of water at surfaces and origin of repulsive hydration forces[J]. Nature, 1983, 306: 249-250.
[14]ISRAELACHVILI J N, MCGUIGGAN P M. Forces between surfaces in liquids[J]. Science, 1988, 241: 795-800.
[15]MORROW C A, MOORE D E, LOCKNER D A. Frictional strength of wet and dry montmorillonite[J]. Journal of Geophysical Research: Solid Earth, 2017, 122(5): 3392-3409.

备注/Memo

备注/Memo:
收稿日期:2019-04-06修改稿日期:2019-11-11
基金项目:国家自然科学基金项目(51479023);国家留学基金资助项目(201706060154)
第一作者:段晓梦(1986-),男,博士生,主要从事非饱和土力学研究.E-mail: xmd2132@126.com
更新日期/Last Update: 2020-01-22