干湿循环作用下压实黄土动强度性质试验研究

doi:10.13722/j.cnki.jrme.2019.0945

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (482 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要为了解干湿循环作用下压实黄土动强度的变化规律，对不同干湿循环路径的试样开展土动三轴试验和扫描电镜试验，得到不同干湿循环次数下压实黄土的动强度和微观结构图像。结果表明：压实黄土的动强度和动强度指标随干湿循环次数增加先减小再逐渐增大，受干湿循环幅度影响，曲线的转折点明显不同；动强度指标劣化度随干湿循环次数增加先增大再减小，甚至出现负值；临界干湿循环次数nc是压实黄土整体结构损伤和整体结构强化的界限，不同干湿循环幅度的临界干湿循环次数不同。干湿循环过程中土样的宏观与微观结构特征表明，增湿过程孔隙数量不断增多和减湿过程土样表面及内部出现裂隙导致了压实黄土结构损伤和动强度降低；土颗粒结构向镶嵌结构发展，孔隙结构向均匀小孔隙演化和基质吸力使土样趋于密实是结构强化和动强度提高的主要原因。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	王铁行1
	郝延周1
	汪朝1
	程磊2
	李江乐1

关键词 ：土力学, 压实黄土, 干湿循环, 动强度, 临界干湿循环次数, 微观结构

Abstract：In order to understand the dynamic strength change law of compacted loess caused by wetting-drying cycles，a series of wetting-drying cycles tests，soil dynamic triaxial tests and scanning electron microscope tests were carried out under different wetting-drying cycle paths，and the dynamic strength and microstructure images of compacted loess were obtained. The results indicate that the dynamic strength and dynamic strength index of compacted loess decrease first and then increase with increasing the number of wetting-drying cycles，and that the turning points of the ，cd-n and curves are obviously different due to the influence of the wetting-drying amplitude. The degradation degree of the dynamic strength increases first and then decreases with increasing the number of wetting-drying cycles，and even has a negative value. The critical wetting-drying cycles number nc is the limit of the whole structure damage and the whole structure strengthening of compacted loess，and changes with the wetting-drying amplitude. The macro and micro structure characteristics of samples in the process of wetting-drying cycles indicate that the increasing number of pores in the humidifying process and the cracks on the surface and in the inside of samples during dehumidification lead to the structural damage and strength reduction of compacted loess. The main reasons for structure strengthening and strength increasing are that soil particle structure develops to mosaic structure，pore structure develops to uniform small pore and matrix suction makes soil sample tend to be dense.

Key words： soil mechanics')" href="#">

soil mechanics compacted loess wetting-drying cycles dynamic strength critical wetting-drying cycles number ')" href="#">microstructure

引用本文:

王铁行1，郝延周1，汪朝1，程磊2，李江乐1. 干湿循环作用下压实黄土动强度性质试验研究[J]. 岩石力学与工程学报, 2020, 39(6): 1242-1251.
WANG Tiehang1，HAO Yanzhou1，WANG Zhao1，CHENG Lei2，LI Jiangle1. Experimental study on dynamic strength properties of compacted loess under wetting-drying cycles. , 2020, 39(6): 1242-1251.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0945 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I6/1242

[1]	GUAN G S，RAHARDJO H，CHOON L E . Shear strength equations for unsaturated soil under drying and wetting[J]. Journal of Geotechnical and Geoenvironmental Engineering，2010，136(4)：594-606.
[3]	TANG C S，CUI Y J，SHI B，et al. Desiccation and cracking behaviour of clay layer from slurry state under wetting-drying cycles[J]. Geoderma，2011，166(1)：111-118.
[7]	刘宏泰，张爱军，段涛，等. 干湿循环对重塑黄土强度和渗透性的影响[J]. 水利水运工程学报，2010，(4)：38-41.(LIU Hongtai，ZHANG Aijun，DUAN Tao，et al. The influence of alternate dry-wet on the strength and permeability of remolded loess[J]. Hydro-Science and Engineering，2010，(4)：38-41.(in Chinese))
[10]	NOWAMOOZ H，MASROURI F. Influence of suction cycles on the soil fabric of compacted swelling soil[J]. Comptes Rendus Geoscience，2010，342(12)：901-910.
[8]	胡长明，袁一力，王雪艳，等. 干湿循环作用下压实黄土强度劣化模型试验研究[J]. 岩石力学与工程学报，2018，37(12)：2 804- 2 817.(HU Changming，YUAN Yili，WANG Xueyan，et al. Experimental study on strength deterioration model of compacted loess under wetting-drying cycles[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(12)：2 804-2 817.(in Chinese))
[12]	KHOLGHIFARD M，AHMAD K，ALI N，et al. Collapse/swell potential of residual laterite soil due to wetting and drying-wetting cycles[J]. National Academy Science Letters，2014，37(2)：147-153.
[14]	刘文化，杨庆，唐小微，等. 干湿循环条件下粉质黏土在循环荷载作用下的动力特性试验研究[J]. 水利学报，2015，46(4)：425-431.(LIU Wenhua，YANG Qing，TANG Xiaowei，et al．Experimental study on the dynamic characteristics of silt clay subjected to drying-wetting cycles under cyclic loading[J]. Journal of Hydraulic Engineering，2015，46(4)：425-431.(in Chinese))
[17]	陈存礼，杨鹏，何军芳. 饱和击实黄土的动力特性研究[J]. 岩土力学，2007，28(8)：1 551-1 556.(CHEN Cunli，YANG Peng，HE Junfang. Research on dynamic characteristics of saturated compacted loess[J]. Rock and Soil Mechanics，2007，28(8)：1 551-1 556.(in Chinese))
[26]	王兰民. 黄土动力学[M]. 北京：地震出版社，2003：17-19.(WANG Lanmin．Loess dynamics [M]. Beijing：Seismological Press，2003：17-19.(in Chinese))
[5]	袁志辉，倪万魁，唐春，等. 干湿循环下黄土强度衰减与结构强度试验研究[J]. 岩土力学，2017，38(7)：1 894-1 902.(YUAN Zhihui，NI Wankui，TANG Chun，et al. Experimental study of structure strength and strength attenuation of loess under wetting- drying cycle[J]. Rock and Soil Mechanics，2017，38(7)：1 894- 1 902.(in Chinese))
[6]	王飞，李国玉，穆彦虎，等. 干湿循环条件下压实黄土变形特性试验研究[J]. 岩土力学，2016，37(8)：2 306-2 312.(WANG Fei，LI Guoyu，MU Yanhu，et al. Experimental study of deformation characteristics of compacted loess subjected to drying-wetting cycle[J]. Rock and Soil Mechanics，2016，37(8)：2 306-2 312.(in Chinese))
[13]	程富阳，黄英，周志伟，等. 干湿循环下饱和红土不排水三轴试验研究[J]. 工程地质学报，2017，25(4)：1 017-1 026.(CHENG Fuyang，HUANG Ying，ZHOU Zhiwei，et al. Undrained triaxial test of saturated laterite under drying-wetting cycle[J]. Journal of Engineering Geology，2017，25(4)：1 017-1 026.(in Chinese))
[15]	唐剑潇. 干湿循环后路基石灰改良土的动力特性及应用[硕士学位论文][D]. 天津：天津大学，2007.(TANG Jianxiao. Dynamic characteristics and application of lime-improved subgrade soil after dry-wet cycling[M. S. Thesis][D]. Tianjin：Tianjin University，2007.(in Chinese))
[22]	曹玲，王志俭，张振华. 降雨-蒸发条件下膨胀土裂隙演化特征试验研究[J]. 岩石力学与工程学报，2016，35(2)：413-421.(CAO Ling，WANG Zhijian，ZHANG Zhenhua. Experimental research of cracking process of expansive soil under rainfall infiltration and evaporation[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(2)：413-421.(in Chinese))
[24]	谢定义. 土动力学[M]. 北京: 高等教育出版社，2011：142-143(XIE Dingyi. Soil dynamics[M]. Beijing：Higher Education Press，2011：142-143.(in Chinese))
[19]	刘亚明，王家鼎，谷天峰. 循环荷载下压实黄土动力特性的试验研究[J]. 水文地质工程地质，2015，42(3)：108-112.(LIU Yaming，WANG Jiading，GU Tianfeng. Dynamic characteristics of compacted loess under cyclic loads[J]. Hydrogeology and Engineering，2015，42(3)：108-112.(in Chinese))
[23]	中华人民共和国行业标准编写组. SL237—1999 土工试验规程[S]. 北京：中国计划出版社，1999.(The Professional Standards Compilation Group of People¢s Republic of China. SL237—1999 Specification of soil test[S]. Beijing：China Planning Press，1999.(in Chinese))
[29]	谷天峰，王家鼎，郭乐，等. 基于图像处理的Q3黄土的微观结构变化研究[J]. 岩石力学与工程学报，2011，30(增1)：3 185-3 192. (GU Tianfeng，WANG Jiading，GUO Le，et al．Study of Q3 loess microstructure changes based on image Processing[J]．Chinese Journal of Rock Mechanics and Engineering，2011，30(Supp.1)：3 185-3 192. (in Chinese))
[4]	WANG D Y，TANG C S，CUI Y J，et al. Effects of wetting-drying cycles on soil strength profile of a silty clay in micro-penetrometer tests[J]. Engineering Geology，2016，206：60-70.
[21]	杨利国，骆亚生，李焱，等．初始应力条件对压实黄土动强度影响的研究[J]．岩土力学，2010，31(1)：87-91.(YANG Liguo，LUO Yasheng，LI Yan，et al．Research on effect of initial stress conditions on dynamic strength of compacted loess[J]．Rock and Soil Mechanics，2010，31(1)：87-91.(in Chinese))
[2]	PIRES L F，BACCHI O O S，REICHARDT K. Gamma ray computed tomography to evaluate wetting/drying soil structure changes[J]. Nuclear Instruments and Methods in Physics Research，Section B：Beam Interactions with Materials and Atoms，2005，229(3)：443-456.
[11]	SITHARAM T G. Micromechanical modeling of granular materials: effect of confining pressure on mechanical behavior[J]. Mechanics of Materials，1999，31(10)：653-665.
[20]	刘保健，张晓荣，程海涛．应变控制下压实黄土的动三轴试验研究[J]. 岩土力学，2007，28(6)：1 073-1 076.(LIU Baojian，ZHANG Xiaorong，CHENG Haitao. Study on compacted loess under strain control at dynamic triaxial test[J]. Rock and Soil Mechanics，2007，28(6)：1 073-1 076.( in Chinese))
[28]	LIU C，SHI B，ZHOU J，et al. Quantification and characterization of microporosity by image processing，geometric measurement and statistical methods：application on SEM images of clay materials[J]. Applied Clay Science，2011，54(1)：97-106.
[9]	张芳枝，陈晓平. 反复干湿循环对非饱和土的力学特性影响研究[J]. 岩土工程学报，2010，32(1)：41-46.(ZHANG Fangzhi，CHEN Xiaoping. Influence of repeated drying and wetting cycles on mechanical behaviors of unsaturated soil[J]. Chinese Journal of Geotechnical Engineering，2010，32(1)：41-46.(in Chinese))
[18]	李又云，谢永利，刘保健. 路基压实黄土动力特性的试验研究[J]. 岩石力学与工程学报，2009，28(5)：1 037-1 046.(LI Youyun，XIE Yongli，LIU Baojian. Experimental research on dynamic characteristics of roadbed compaction loess[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(5)：1 037-1 046.(in Chinese))
[27]	FREDLUND D G，RAHARDJO H . Soil Mechanics for Unsaturated Soils[M]. New York：John Wiley and Sons，1993：178-181.
[16]	赵明龙，王建华，梁爱华. 干湿循环对水泥改良土疲劳强度影响的试验研究[J]. 中国铁道科学，2005，26(2)：25-28.(ZHAO Minglong，WANG Jianhua，LIANG Aihua．Experimental study on the effect of dry-wet cycle on fatigue strength of cement modified soil[J]. China Railway Science，2005，26(2)：25-28.(in Chinese))
[25]	中华人民共和国国家标准编写组. GB/T 50269—2015 地基动力特性测试规范[S]. 北京：中国计划出版社，2015.(The National Standards of People¢s Republic of China. GB/T 50269—2015 Code for measurement methods of dynamic properties of subsoil[S]. Beijing：China Planning Press，2015.(in Chinese))