不排水条件下轴向加卸载时结构性土的力学特性探讨

doi:10.13722/j.cnki.jrme.2016.0266

Abstract
Figure/Table
References (0)
Related Citation (15)

Download: PDF (592 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract To study the mechanical properties of structured soils under undrained conditions，the triaxial compression tests on reconstituted soils and two kinds of structured soils with initial stress-induced anisotropy and isotropy were carried out under axially loading-unloading-reloading. The soils were tested under consolidation- undrained(CU) conditions at the confining pressures of 25，50，100，200 and 400 kPa，and the results of tests are analyzed with the binary-medium theory. It is found that the structured soils have stronger structures at lower consolidation stress. Meanwhile，Eave does not change significantly in different stress cycles. When the confining pressures are higher，the structures of soils are weakened，and their characteristics are similar to those of reconstituted soils. Because of the structure weakening and positive pore pressure，Eave decreases with the increase of εa. With the increase of the axial strain，the breakage rate of the bonded components and the soil particle spacing of friction components increase. In the meantime，the tendency of the volume contraction becomes more apparent when unloading.

Key words： soil mechanics structured soils consolidation undrain conditions axially loading-unloading tests mechanical properties

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	HE Miao1
	2
	LIU Enlong1
	2
	CHEN Yajun3
	TANG Yong1
	2

Cite this article:

HE Miao1,2,LIU Enlong1, et al. Investigation on mechanical properties of structured soils subjected to axially loading-unloading under undrained conditions[J]. , 2017, 36(2): 466-474.

URL:

http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2016.0266 OR http://www.rockmech.org/EN/Y2017/V36/I2/466

[1]	沈珠江. 软土工程特性和软土地基设计[J]. 岩土工程学报，1998，20(1)：100-111.(SHEN Zhujiang. Engineering properties of soft soils and design of soft ground[J]. Chinese Journal of Geotechnical Engineering，1998，20(1)：100-111.(in Chinese))
[16]	刘恩龙，沈珠江. 人工制备结构性土力学特性试验研究[J]. 岩土力学，2007，28(4)：679-683.(LIU Enlong，SHEN Zhujiang. Experimental study on mechanical properties of artificially structured soils[J]. Rock and Soil Mechanics，2007，28(4)：679-683.(in Chinese)) " target="_blank">
[2]	龚晓南，熊传祥，项可祥，等. 粘土结构性对其力学性质的影响及形成原因分析[J]. 水利学报，2000，(10)：43-47.(GONG Xiaonan，XIONG Chuanxiang，XIANG Kexiang，et al. The formation of clay structure and its influence on mechanical characteristics of clay[J]. Journal of Hydraulic Engineering，2000，(10)：43-47.(in Chinese)) " target="_blank">
[4]	孔令伟，吕海波，汪稔. 湛江海域结构性海洋土的工程特性及其微观机制[J]. 水利学报，2002，(9)：82-88.(KONG Lingwei，LU Haibo，WANG Ren，et al. Engineering properties and micro- mechanism of structural marine soil in Zhanjiang sea area[J]. Journal of Hydraulic Engineering，2002，(9)：82-88.(in Chinese)) " target="_blank">
[6]	陈铁林，沈珠江，杨代泉. 湿陷性黄土渠道浸水变形的数值模拟[J]. 水利学报，2005，36(3)：309-313，320.(CHEN Tielin，SHEN Zhujiang，YANG Daiquan. Numerical simulation on wetting deformation of collapsible loess ditch[J]. Journal of Hydraulic Engineering，2005，36(3)：309-313，320.(in Chinese)) " target="_blank">
[8]	DESAI C S，TOTH J. Disturbed state constitutive modeling based on stress-strain and nondestructive behavior[J]. International Journal of Solids and Structures，1996，33(11)：1 619-1 650. " target="_blank">
[12]	沈珠江，刘恩龙，陈铁林. 岩土二元介质模型的一般应力应变关系[J]. 岩土工程学报，2005，27(5)：489-494.(SHEN Zhujiang，LIU Enlong，CHEN Tielin. Generalized stress-strain relationship of binary medium model for geological materials[J]. Chinese Journal of Geotechnical Engineering，2005，27(5)：489-494.(in Chinese))
[9]	刘维正，石名磊，缪林昌. 基于扰动状态概念的结构性土压缩特性分析[J]. 岩土力学，2010，31(11)：3 475-3 480.(LIU Weizheng，SHI Minglei，MIAO Linchang. Analysis of compressibility of structural soils based on disturbed state concept[J]. Rock and Soil Mechanics，2010，31(11)：3 475-3 480.(in Chinese)) " target="_blank">
[13]	刘恩龙. 岩土破损力学：结构块破损机制与二元介质模型[J]. 岩土力学，2010，31(增1)：13-22.(LIU Enlong. Breakage mechanics for geomaterials：Breakage mechanism of structural blocks and binary- medium model[J]. Rock and Soil Mechanics，2010，31(Supp. 1)：13-22.(in Chinese)) " target="_blank">
[15]	蒋明镜，沈珠江. 结构性黏土试样人工制备方法研究[J]. 水利学报，1997，(1)：56-61.(JIANG Mingjing，SHEN Zhujiang. A method of artificial preparation of structured clay samples[J]. Journal of Hydraulic Engineering，1997，(1)：56-61.(in Chinese)) " target="_blank">
[17]	罗开泰，聂青，张树祎，等. 人工制备初始应力各向异性结构性土方法探讨[J]. 岩土力学，2013，34(10)：2 815-2 820.(LUO Kaitai，NIE Qing，ZHANG Shuyi，et al. Investigation on artificially structured soils with initial stress-induced anisotropy[J]. Rock and Soil Mechanics，2013，34(10)：2 815-2 820.(in Chinese)) " target="_blank">
[19]	刘恩龙，罗开泰. 轴向循环加载条件下人工制备结构性土力学特性[J]. 北京工业大学学报，2012，38(2)：180-185.(LIU Enlong，LUO Kaitai. Mechanical properties of artificially prepared structured soils subjected to axially cyclic loading[J]. Journal of Beijing University of Technology，2012，38(2)：180-185.(in Chinese)) " target="_blank">
[7]	陈昌禄，邵生俊，佘芳涛. 土结构性变化对开挖边坡稳定性的影响分析[J]. 岩土工程学报，2011，33(12)：1 938-1 942.(CHEN Changlu，SHAO Shengjun，SHE fangtao. Impact of structural change of soils on stability in slope excavation[J]. Chinese Journal of Geotechnical Engineering，2011，33(12)：1 938-1 942.(in Chinese)) " target="_blank">
[11]	沈珠江. 土体结构性的数学模型-21世纪土力学的核心问题[J]. 岩土工程学报，1996，18(1)：95-97.(SHEN Zhujiang. Mathematic model of structural soil—The key problem for soil mechanics in 21st century[J]. Chinese Journal of Geotechnical Engineering，1996，18(1)：95-97.(in Chinese))
[18]	李广信，武世锋. 土的卸载体缩的试验研究及其机制探讨[J]. 岩土工程学报，2002，24(1)：47-50.(LI Guangxin，WU Shifeng. Experimental research on volume-contraction of soil under unloading and examination of its mechanism[J]. Chinese Journal of Geotechnical Engineering，2002，24(1)：47-50.(in Chinese))
[3]	SCHMERTMANN J H. The mechanical aging of soils[J]. Journal of Geotechnical Engineering，1991，117(9)：1 288-1 330. " target="_blank">
[5]	吕海波，汪稔，孔令伟，等. 结构性对琼州海峡软土压缩特性的影响[J]. 岩土力学，2001，22(4)：467-469.(LU Haibo，WANG Ren，KONG Lingwei，et al. The influences of soil structure on compressibility of Qiongzhou strait soft marine clay[J]. Rock and Soil Mechanics，2001，22(4)：467-469.(in Chinese)) " target="_blank">
[10]	王常明，匡少华，王钢城，等. 结构性土固结不排水剪特性的一种描述方法[J]. 岩土力学，2010，31(7)：2 035-2 039.(WANG Changming，KUANG Shaohua，WANG Gangcheng，et al. A method for describing consolidated-undrained shear behavior of structured soil[J]. Rock and Soil Mechanics，2010，31(7)：2 035-2 039.(in Chinese)) " target="_blank">
[14]	LEROUEIL S，VAUGHAN P. R. The general and congruent effects of structure in natural soils and week rocks[J]. Geotechnique，1990，40(3)：467-488. " target="_blank">