考虑路基平衡湿度状态的黄泛区中高液限黏土抗剪强度研究

doi:10.13722/j.cnki.jrme.2018.0577

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摘要为了给黄泛平原区冲淤积黏性土路基设计与施工提供指导，对黄泛区中高液限黏土路基的抗剪强度、平衡湿度和长期稳定性进行了研究。基于24种工况下的直剪试验，获得黄泛区中高液限黏土抗剪强度指标与压实状态的相关关系，建立土体黏聚力和内摩擦角与含水率和压实度的双因素经验关系式；通过84组滤纸试验，获得不同初始压实状态下的饱和度与基质吸力的关系曲线，分别根据MEPDG法和Frendlund & Xing模型确定土水特征曲线表达式的经验参数；进而建立黄泛区中高液限黏土路基的平衡含水率及其对应的抗剪强度计算公式；结合路基稳定安全系数，提出考虑平衡湿度的黄泛区路基临界填土高度。结果表明：以磨圆度较高的粉粒为主要骨架的黄泛区中高液限黏土，其抗剪强度指标受含水率的影响非常显著且表现出阶段性的减小规律，但内摩擦角几乎不受压实度的影响；土体的进气值非常高(199 kPa以上)，且随压实度的增加而提高，表明高压实度土体在高饱和度下具有很强的保水能力；平衡含水率较最优含水率增加了4%～8%，导致抗剪强度较施工状态有很大幅度的降低；对于黄泛区典型双向四车道高速公路，施工含水率和平衡含水率下对应的临界路基高度分别为20和8 m。

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	蒋红光1
	曹让1
	马晓燕2
	赵庆1
	4
	姚占勇1
	朱世超3
	陈鲁川3

关键词 ：土力学, 压实状态, 抗剪强度, 路基平衡含水率, 土水特征曲线, 黄泛区中高液限黏土

Abstract：In order to provide a guide for design and construction of clayey soil subgrades in the Yellow River Alluvial Plain，the physical and mechanical properties of the medium-high liquid limit clay subgrade including the shear strength，the equilibrium moisture content and the long-term stability were studied. Direct shear tests under 24 conditions were performed. The relationships between the shear strength indices and compaction conditions were discussed，and the empirical formulae of the soil cohesion and the friction angle were established as functions of the moisture content and the compaction degree. Based on the 84 groups filter tests，the relationships between the saturation degree and the matric suction were obtained at different initial compaction states，and the empirical parameters of the soil-water characteristic curve equations were given according to MEPDG method and Frendlund & Xing model. The equations of the equilibrium moisture content and the corresponding shear strength of the medium-high liquid limit clay subgrade were deduced，and the critical subgrade height was proposed considering the safety factor and the equilibrium moisture content. Results show that，for the medium-high liquid limit clay mainly composed of silt particle with higher roundness in the Yellow River flooded areas，the shear strength indices is markedly influenced by the soil moisture content but that the friction angle is independent on the compaction degree. The high soil air-entry value(more than 199 kPa)，ascending with increasing the compaction degree，indicates that the soil with a high compaction degree has great water retaining capacity at high saturation state. The equilibrium moisture content is bigger by 4%–8% than the optimum moisture content，which results in a larger reduction of the shear strength. For the typical bi directional and four lane highway in the Yellow River flooded areas，the critical subgrade heights at the construction and equilibrium moisture contents are 20 m and 8 m respectively.

Key words： soil mechanics compaction state shear strength subgrade equilibrium moisture content soil-water characteristic curve medium-high liquid limit clay in the Yellow River flooded areas

引用本文:

蒋红光1，曹让1，马晓燕2，赵庆1，4，姚占勇1，朱世超3，陈鲁川3. 考虑路基平衡湿度状态的黄泛区中高液限黏土抗剪强度研究[J]. 岩石力学与工程学报, 2018, 37(12): 2819-2828.
JIANG Hongguang1，CAO Rang1，MA Xiaoyan2，ZHAO Qing1，4，YAO Zhanyong1，ZHU Shichao3，CHEN Luchuan3. Shear strength of the medium-high liquid limit clay in the Yellow River Flooded Areas considering the subgrade equilibrium moisture condition. , 2018, 37(12): 2819-2828.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0577 或 http://www.rockmech.org/CN/Y2018/V37/I12/2819

[15]	CASAGRANDE A. Research on the Atterberg limits of soils[J]. Public Roads，1932，13(8)：121-136.
[25]	NCHRP Project 1-37A. Guide for mechanistic-empirical design of new and rehabilitated pavement structures[S]. [S. l.]：[s. n.]，2004
[2]	FREDLUND D G，MORGENSTERN N R，WIDGER R A. The shear strength of unsaturated soils[J]. Canadian Geotechnical Journal，1978，15(3)：313-321.
[5]	包承纲，詹良通. 非饱和土性状及其与工程问题的联系[J]. 岩土工程学报，2006，28(2)：129-136.(BAO Chenggang，ZHAN Liangtong. Relationship between unsaturated soil behavior and engineering problems[J]. Chinese Journal of Geotechnical Engineering，2006，28(2)：129-136.(in Chinese))
[8]	OTALVARO I F，NETO M P C，DELAGE P，et al. Relationship between soil structure and water retention properties in a residual compacted soil[J]. Engineering Geology，2016，205：73-80.
[10]	凌华，殷宗泽. 非饱和土强度随含水量的变化[J]. 岩石力学与工程学报，2007，26(7)：1 499-1 503.(LING Hua，YIN Zongze. Variation of unsaturated soil strength with water contents[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(7)：1 499-1 503. (in Chinese))
[12]	王林浩，白晓红，冯俊琴. 压实黄土状填土抗剪强度指标的影响因素探讨[J]. 岩土工程学报，2010，32(增2)：132-135.(WANG Linhao，BAI Xiaohong，FENG Junqin. Discussion on shearing strength influencing factors of compacted loess-like backfill[J]. Chinese Journal of Geotechnical Engineering，2010，32(Supp.2)：132-135.(in Chinese))
[18]	边加敏，王保田. 含水量对非饱和土抗剪强度参数的影响研究[J]. 地下空间与工程学报，2011，7(1)：17-21.(BIAN Jiamin，WANG Baotian. Research on influence of water contents on the shear strength behavior of unsaturated soils[J]. Chinese Journal of Underground Space and Engineering，2011，7(1)：17-21.(in Chinese))
[20]	STANDARD A. D5298. Standard test method for measurement of soil potential(suction) using filter paper[C]// ASTM International，West Conshohocken. Philadelphia，PA：American Society for Testing and Materials，2003：52-54. DOI：10.1520/D5298-10.
[22]	崔凯，林维康. 川西非饱和混合土土水特征曲线研究[J]. 中国公路学报，2017，30(9)：44-50.(CUI Kai，LIN Weikang. Research on soil-water characteristic curve of unsaturated mixed soil in western sichuan[J]. China Journal of Highway and Transport，2017，30(9)：44-50.(in Chinese))
[3]	FREDLUND D G，XING A，FREDLUND M D，et al. The relationship of the unsaturated soil shear to the soil-water characteristic curve[J]. Canadian Geotechnical Journal，1996，33(3)：440-448.
[13]	黄琨，万军伟，陈刚，等. 非饱和土的抗剪强度与含水率关系的试验研究[J]. 岩土力学，2012，33(9)：2 600-2 604.(HUANG Kun，WAN Junwei，CHEN Gang，et al. Testing study of relationship between water content and shear strength of unsaturated soils[J]. Rock and Soil Mechanics，2012，33(9)：2 600-2 604.(in Chinese))
[23]	FREDLUND D G，XING A. Equations for the soil-water characteristic curve[J]. Canadian Geotechnical Journal，1994，31(4)：521-532.
[1]	姚占勇，练继建，艾贻中，等. 黄河冲(淤)积粉质二灰土的压实特性研究[J]. 岩土工程学报，2007，29(5)：664-670.(YAO Zhanyong，LIAN Jijian，AI Yizhong，et al. Compaction properties on yellow river silty soil stabilized with lime-flyash[J]. Chinese Journal of Geotechnical Engineering，2007，29(5)：664-670.(in Chinese))
[11]	申春妮，方祥位，王和文，等. 吸力、含水率和干密度对重塑非饱和土抗剪强度影响研究[J]. 岩土力学，2009，30(5)：1 347-1 351. (SHEN Chunni，FANG Xiangwei，WANG Hewen，et al. Research on effects of suction，water content and dry density on shear strength of remolded unsaturated soils[J]. Rock and Soil Mechanics，2009，30(5)：1 347-1 351.(in Chinese))
[21]	王钊，杨金鑫，况娟娟，等. 滤纸法在现场基质吸力量测中的应用[J]. 岩土工程学报，2003，25(4)：405-408.(WANG Zhao，WANG Jinxin，KUANG Juanjuan，et al. Application of filter paper method in field measurement of matric suction[J]. Chinese Journal of Geotechnical Engineering，2003，25(4)：405-408.(in Chinese))
[4]	包承纲，詹良通，龚壁卫. 非饱和土的特性及其抗剪强度问题[C]//中国土木工程学会第八届土力学及岩土工程学术会议论文集. [S. l.]：[s. n.]，2001：173-176.(BAO Chenggang，ZHAN Liangtong，GONG Biwei. Characteristics of unsaturated soil and its shear strength problem[C]// Proceedings of the 8th Annual Conference on Soil Mechanics and Geotechnical Engineering of China Civil Engineering Society. [S. l.]：[s. n.]，2001：173-176.(in Chinese))
[7]	孙德安，刘文捷，吕海波. 桂林红黏土的土-水特征曲线[J]. 岩土力学，2014，35(12)：3 345-3 351.(SUN Dean，LIU Wenjie，Lǚ Haibo. Soil-water characteristic curve of Guilin lateritic clay[J]. Rock and Soil Mechanics，2014，35(12)：3 345-3 351.(in Chinese))
[9]	杨庆，贺洁，栾茂田. 非饱和红黏土和膨胀土抗剪强度的比较研究[J]. 岩土力学，2003，24(1)：13-17.(YANG Qing，HE Jie，LUAN Maotian. Comparative study on shear strength of unsaturated red clay and expansive soils[J]. Rock and Soil Mechanics，2003，24(1)：13-17.(in Chinese))
[17]	肖军华，刘建坤，彭丽云，等. 黄河冲积粉土的密实度及含水率对力学性质影响[J]. 岩土力学，2008，29(2)：409-414.(XIAO Junhua，LIU Jiankun，PENG Liyun，et al. Effects of compactness and water yellow-river alluvial silt content on its mechanical behaviors[J]. Rock and Soil Mechanics，2008，29(2)：409-414.(in Chinese))
[14]	许旭堂，简文彬，柳侃. 含水率和干密度对残积土抗剪强度参数的影响[J]. 地下空间与工程学报，2015，11(2)：364-369.(XU Xutang，JIAN Wenbin，LIU Kan. The influence of water content and dry density on shear strength parameters of residual soil[J]. Chinese Journal of Underground Space and Engineering，2015，11(2)：364-369.(in Chinese))
[19]	张添锋，孙德安，刘文捷. 桂林压实红黏土抗剪强度与含水率关系[J]. 上海大学学报：自然科学版，2014，20(5)：586-595.(ZHANG Tianfeng，SUN Dean，LIU Wenjie. Relation between shear strength and moisture content for Guilin laterite[J]. Journal of Shanghai University：Natural Science，2014，20(5)：586-595.(in Chinese))
[24]	ZAPATA C. E. Uncertainty in soil-water characteristics curve and impact on unsaturated shear strength predictions[Ph. D. Thesis][D]. Tempe，USA：Arizona State University，1999.
[6]	李志清，李涛，胡瑞林. 非饱和土水分特征曲线特性[J]. 中国公路学报，2007，20(3)：23-28.(LI Zhiqing，LI Tao，HU Ruilin. Property of soil-water characteristic curve for unsaturated soil[J]. China Journal of Highway and Transport，2007，20(3)：23-28.(in Chinese))
[16]	TERZAGHI K，PECK R B，MESRI G. Soil mechanics in engineering practice[M]. [S. l.]：John Wiley & Sons，1996：24-27.