收稿日期: 2015-04-22
网络出版日期: 2016-10-31
基金资助
国家自然科学基金资助项目(41372280)
Strength property and interaction mechanism of sand reinforced with hemispherical inclusions
Received date: 2015-04-22
Online published: 2016-10-31
杨磊1, 张孟喜1, 彭基敏2, 孙州1, 高昂1 . 半球形复合立体加筋砂土的强度特性及作用机理[J]. 上海大学学报(自然科学版), 2016 , 22(5) : 656 -664 . DOI: 10.3969/j.issn.1007-2861.2015.02.019
A series of triaxial tests were carried out to study strength property of sand reinforced by hemispherical inclusions of rubber. The behavior of reinforced sand was studied in terms of shear strength of sand, stress-strain relation and the failure modes of specimen. Influences of confining pressures, number of hemispheres and number of reinforced layers on reinforced sand strength were discussed. The interaction mechanism between the hemispherical rubber and sand were also discussed. It was shown that shear strength is improved significantly under lower confining pressures. In addition, the reinforcing effect of hemispherical inclusions was increased with the number of reinforced layers increasing. Compared with sand reinforced with horizontal inclusions, the soil reinforced with hemispherical inclusions was bound more strongly, shear strength of reinforced soil was more improved, and the cohesion and friction angle of reinforced sand were improved more significantly with the number of hemisphere increasing.
Key words： reinforcement; stress-strain; triaxial test; hemispherical inclusion; strength
[1] 丁万涛, 雷胜友. 加筋膨胀土不同布筋型式三轴试验研究[J]. 岩土力学, 2010, 31(4): 1147-1150.
[2] 廖红建, 李涛, 彭建兵. 高陡边坡滑坡体黄土的强度特性研究[J]. 岩土力学, 2011, 32(7): 1939-1944.
[3] 赵莹莹, 赵燕茹, 李驰, 等. 纤维风沙土静力特性三轴试验研究[J]. 黑龙江工程学院学报, 2014, 28(4): 8-12.
[4] 魏松, 朱俊高, 钱七虎, 等. 粗粒料颗粒破碎三轴试验研究[J]. 岩土工程学报, 2009, 31(4): 533-538.
[5] 刘芳, 孙红, 葛修润. 玻璃纤维土的三轴试验研究[J]. 上海交通大学学报, 2011, 45(5): 762-766.
[6] 李陈财, 璩继立, 李贝贝, 等. 含水率对麦秸秆加筋土强度影响的试验研究[J]. 水资源与水工程学报, 2014, 25(6): 203-206.
[7] Bagherzadeh-Khalkhali A, Mirghasemi A A. Numerical and experimental direct shear tests for coarse-grained soils [J]. Particuology, 2009, 7(1): 83-91.
[8] 陈昌富, 刘怀星, 李亚平. 草根加筋土的室内三轴试验研究[J]. 岩土力学, 2007, 28(10): 2041-2045.
[9] Sayeed M M A, Ramaiah B J, Rawal A. Interface shear characteristics of jute/polypropylene hybrid nonwoven geotextiles and sand using large size direct shear test [J]. Geotextiles and Geomembranes, 2014, 42(1): 63-68.
[10] 魏红卫, 喻泽红, 邹银生. 土工合成材料加筋土抗剪作用的试验研究[J]. 水利学报, 2005, 36(5): 555-562.
[11] 杨庆, 张慧珍, 栾茂田. 非饱和膨胀土抗剪强度的试验研究[J]. 岩石力学与工程学报, 2004, 23(3): 420-425.
[12] Qu J L, Li C C, Liu B S, et al. Effects of random inclusion of wheat straw fibers on shear strength characteristics of Shanghai cohesive soil [J]. Geotechnical and Geological Engineering, 2013, 31(2): 420-425.
[13] Zhang M X, Zhou H, Javadi A A, et al. Experimental and theoretical investigations of strength of soil reinforced with multi-layer horizontal-vertical orthogonal elements [J]. Geotextiles and Geomembranes, 2008, 26(1): 1-13.
[14] 张孟喜, 赵岗飞, 魏伟, 等. 轴对称条件下水平-竖向加筋黏性土的强度分析[J]. 土木工程学报, 2010, 43(8): 115-120.
[15] Jewell R A, Pedley M J. Analysis for soil reinforcement with bending stiffness [J]. Journal of Geotchnical Engineering, 1992, 118(10): 1505-1528.
/
| 〈 |
|
〉 |
