| 干湿循环作用下膨胀土裂隙演化规律试验研究 |
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| 引用本文： | 张家俊,龚壁卫,胡波,周小文,王军.干湿循环作用下膨胀土裂隙演化规律试验研究[J].岩土力学,2011,32(9):2729-2734. |
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| 作者姓名： | 张家俊 龚壁卫 胡波 周小文 王军 |
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| 作者单位： | 1. 华南理工大学 亚热带建筑科学国家重点试验室，广州 510640；2. 长江科学院 水利部岩土力学与工程重点试验室，武汉 430010 |
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| 基金项目： | 国家自然科学基金资助(No.51008035); 水利部岩土力学与工程重点实验室开放基金(No.G07-02) |
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| 摘 要： | 对南阳膨胀土在反复干湿循环作用下的裂隙演化规律进行了室内试验研究。试验中采用烘干法模拟脱湿过程，采用抽气饱和法模拟饱和过程。在脱湿过程中，定时对土样进行称重、定点拍照，以记录裂隙发育状况。利用矢量图技术对裂隙照片进行矢量化处理，以提取裂隙的各种几何要素，继而进行裂隙度计算。裂隙度变化规律分析结果表明，影响裂隙张开程度的关键因素并非土体含水率，而是含水率梯度，而脱湿速率的空间分布、土块渗透特性以及土块尺寸大小则是决定含水率梯度大小的关键因素；膨胀土裂隙在干湿循环的作用下会逐步发育，主要体现在裂隙总面积与总长度的增加，但此作用有限，裂隙的发育达到一定程度以后便会因为土块尺寸过小而停止；反复干湿循环会使土体产生范性变形，该范性变形与完整土块的胀缩特性并无直接联系，其主要成因是裂隙的发育与土体完整性的破坏，裂隙越发育，土体范性变形量越大
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| 关 键 词： | 膨胀土 干湿循环 裂隙演化规律 裂隙度 矢量图 |
| 收稿时间： | 2010-01-28 |
Study of evolution law of fissures of expansive clay under wetting and drying cycles |
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| ZHANG Jia-jun,GONG Bi-wei,HU Bo,ZHOU Xiao-wen,WANG Jun.Study of evolution law of fissures of expansive clay under wetting and drying cycles[J].Rock and Soil Mechanics,2011,32(9):2729-2734. |
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| Authors: | ZHANG Jia-jun GONG Bi-wei HU Bo ZHOU Xiao-wen WANG Jun |
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| Institution: | 1. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China; 2. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China |
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| Abstract: | In the present investigation,laboratorial test is conducted to study the evolution law of the fissures of Nanyang expansive clay under wetting and drying cycles.Oven drying method and vacuum saturating method are employed to simulate the drying and wetting process respectively.In order to record the development of fissures,the specimen is weighed and photographed regularly during the drying process.By employing the vector diagram technology to vectorize the fissures photos;the geometric characters of fissur... |
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| Keywords: | expansive clay wetting and drying cycles evolution law of fissures fissures ratio vector diagram |
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