基于正交设计的复杂环境下土石混填体大型直剪试验研究

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摘要

为了更加系统、全面的研究土石混填体处于复杂环境时的强度特性,综合考虑含水率、浸泡时间、干湿循环、含石量、岩性与土性等因素,采用美国Geotest公司生产的大型直剪仪,并基于正交设计方法开展了一系列土石混填体室内大型直剪试验研究,进而确定出了不同因素对土石混填体抗剪强度有何影响及影响程度,为此类受多因素、多水平影响的试验研究探讨出了一种新的思路。试验结果表明：土石混填体抗剪强度主要源于内部石料间的相互嵌入、咬合及摩擦等作用；含石量是影响土石混填体强度特性最主要的因素,随着试样中含石量的增加其内摩擦角近似呈线性增加；对于试验中所涉及的3种水作用环境,含水率对土石混填体抗剪强度的影响最为显著,且含水率对其剪应力-剪切位移关系曲线亦存在非常重要的影响,相比之下,浸泡时间与干湿循环对试样抗剪强度影响较弱,且试样在浸泡48 h或干湿循环4次后其抗剪强度基本不会再继续弱化；当试样中含石量≥55%时,其抗剪强度受岩性影响较为明显。

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	王江营
	曹文贵
	张超
	汪辉平

关键词 ：正交试验设计, 土石混填体, 直剪试验, 剪切强度, 含水率, 含石量, 剪应力-剪切位移曲线

Abstract：

In order to study the strength characteristics of soil-rock aggregate mixture under complex environment more systematically and comprehensively, a series of lab large-scale direct shear tests are conducted through Geotest direct shear apparatus based on the orthogonal experimental design. These tests take into account variable factors such as water content, soaking time, wetting/drying cycles, stone content, rock property and soil property, etc. Then the degree of influence of these factors on the shear strength of soil-rock aggregate mixture is determined, which can provide a new way for this kind of multi-factor and multi-level researches. The test results indicate that the shear strength of soil-rock aggregate mixture is caused by mutual embedding, mesh and friction of aggregated rock. The rock content is the single primary factor for influencing the strength property of rock-soil aggregate mixture. With the increase of the rock content in the test specimen, the internal friction angle increases linearly. In 3 kinds of varied water effect situations, the water content has the most significant impact on the strength of soil-rock aggregate mixture. It also has high influence on the shape of shear stress-shear displacement curve. In contrast, the soaking time and wetting/drying cycles are less important for the shear strength of rock-soil aggregate mixture, and the shear strength will not continue to weaken when the specimen is soaked for more than 48 hours or under 4 wetting/drying cycles. The shear strength of the specimen is obviously affected by the rock property when its rock content is not less than 55%.

Key words： orthogonal experimental design soil-rock aggregate mixture direct shear test shear strength water content rock content shear stress-shear displacement curve

收稿日期: 2013-02-04

TU411.7

作者简介: 王江营(1985- )，男，河南临颍人，博士研究生，主要从事土石混填体力学特性及岩土本构模型研究工作。E-mail: neimeng686@163.com。

引用本文:

王江营, 曹文贵, 张超, 汪辉平. 基于正交设计的复杂环境下土石混填体大型直剪试验研究[J]. 岩土工程学报, 2013, 35(10): 1849-1856. WANG Jiang-ying, CAO Wen-gui, ZHANG Chao, WANG Hui-ping. Large-scale direct shear tests on soil-rock aggregate mixture under complicated environment based on orthogonal design. Chinese J. Geot. Eng., 2013, 35(10): 1849-1856.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2013/V35/I10/1849

[1] 张宇辉, 张献民, 程国勇. 土石混合介质中石料间隙土压实度剪切波速评价研究[J]. 岩土工程学报, 2011, 33(6): 909-915. (ZHANG Yu-hui, ZHANG Xian-min, CHENG Guo-yong. Evaluation of compactness degree of interval soil in soil-stone mixtures by use of shear-wave velocity[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(6): 909-915. (in Chinese))
[2] 董云, 柴贺军. 土石混合料剪切面分形特征试验研究[J]. 岩土力学, 2007, 28(5): 1015-1020. (DONG Yun, CHAI He-jun. Experimental study on fractal character of shear surface of rock-soil aggregate mixture[J]. Rock and Soil Mechanics, 2007, 28(5): 1015-1020. (in Chinese))
[3] 徐文杰, 胡瑞林, 岳中琦, 等. 基于数字图像分析及大型直剪试验的土石混合体块石含量与抗剪强度关系研究[J]. 岩石力学与工程学报, 2008, 27(5): 996-1007. (XU Wen-jie, HU Rui-lin, YUE Zhong-qi, et al. Research on relationship between rock block proportion and shear strength of soil-rock mixtures based on digital image analysis and large direct shear test[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(5): 996-1007. (in Chinese))
[4] 周志军. 土石混填路基压实质量控制方法研究[D]. 西安: 长安大学, 2006. (ZHOU Zhi-jun. The study on methods of controlling compactness quality in the subgrade filled with earth-rock mixtures [D]. Xi'an: Chang'an University, 2006. (in Chinese))
[5] 油新华, 汤劲松. 土石混合体野外水平推剪试验研究[J]. 岩石力学与工程学报, 2002, 21(10): 1537-1540. (YOU Xin-hua, TANG Jin-song. Research on horizontal push-shear in-situ test of soil and rock-mixture[J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(10): 1537-1540. (in Chinese))
[6] 董云, 柴贺军, 杨慧丽. 土石混填路基原位直剪与室内大型直剪试验比较[J]. 岩土工程学报, 2005, 27(2): 235-238. (DONG Yun, CHAI He-jun, YANG Hui-li. Comparison of shear test in site and lab large-scale shear test for rock-soil aggregate of roadbed[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(2): 235-238. (in Chinese))
[7] XU W J, HU R L, TAN R J. Some geomechanical properties of soil-rock mixtures in Tiger-leaping Gorge Area, China[J]. Géotechnique, 2007, 57(3): 255-264.
[8] 李维树, 丁秀丽, 邬爱清, 等. 蓄水对三峡库区土石混合体直剪强度参数的弱化程度研究[J]. 岩土力学, 2007, 28(7): 1338-1342. (LI Wei-shu, DING Xiu-li, WU Ai-qing, et al. Shear strength degeneration of soil and rock mixture in Three Gorges Reservoir bank slopes under influence of impounding[J]. Rock and Soil Mechanics, 2007, 28(7): 1338-1342. (in Chinese))
[9] 李晓, 廖秋林, 郝建明, 等. 土石混合体力学特性的原位试验研究[J]. 岩石力学与工程学报, 2007, 26(12): 2377-2384. (LI Xiao, LIAO Qiu-lin, HE Jian-ming, et al. Study on in-situ tests of mechanical characteristics on soil-rock aggregate[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(12): 2377-2384. (in Chinese))
[10] VALLEJO L E, MAWBY R. Porosity influence on the shear strength of granular material-clay mixtures[J]. Engineering Geology, 2000, 58(2): 125-136.
[11] 李振, 李鹏. 粗粒土直接剪切试验抗剪强度指标变化规律[J]. 防渗技术, 2002, 8(1): 11-14, 18. (LI Zhen, LI Peng. The variation of shear strength parameters of coarse-grained soil under direct shear test[J]. Technique of Seepage Control, 2002, 8(1): 11-14, 18. (in Chinese))
[12] 董云. 土石混合料强度特性的试验研究[J]. 岩土力学, 2007, 28(6): 1269-1274. (DONG Yun. Experimental study on intensity character of rock-soil aggregate mixture[J]. Rock and Soil Mechanics, 2007, 28(6): 1269-1274. (in Chinese))
[13] JALILI J, JAFARI M K, SHAFIEE A, et al. An investigation on effect of inclusions on heterogeneity of stress, excess pore pressure and strain distribution in composite soils[J]. International Journal of Civil Engineering, 2012, 10(2): 124-138.
[14] 方开泰, 马长兴. 正交与均匀试验设计[M]. 北京: 科学出版社, 2001. (FANG Kai-tai, MA Chang-xing. Orthogonal and uniform experimental design[M]. Beijing: Science Press, 2001. (in Chinese))
[15] 郭庆国. 粗粒土的工程特性及应用[M]. 郑州: 黄河水利出版社, 1998. (GUO Qing-guo. Engineering characteristics of coarse-grained soil and its application[M]. Zhengzhou: Yellow River Water Conservancy Press, 1998. (in Chinese))
[16] 徐文杰, 胡瑞林, 谭儒蛟. 三维极限平衡法在原位水平推剪试验中的应用[J]. 水文地质工程地质, 2006, 33(6): 43-47. (XU Wen-jie, HU Rui-lin, TAN Ru-jiao. Application of 3D limit-equilibrium method for in-situ horizontal push-shear test[J]. Hydrogeology & Engineering Geology, 2006, 33(6): 43-47. (in Chinese))
[17] 赵明华. 土力学与基础工程[M]. 武汉: 武汉理工大学出版社, 2000. (ZHAO Ming-hua. Soil mechanics and foundation engineering[M]. Wuhan: Wuhan University of Technology Press, 2000. (in Chinese))