土工直接拉伸试验装置的研制及应用

张绪涛; 张强勇; 高强; 向文; 王超; 袁圣渤

doi:10.11779/CJGE201407015

土工直接拉伸试验装置的研制及应用 English Version

张绪涛^{1, 2},
张强勇¹,
高强¹,
向文¹,
王超¹,
袁圣渤¹

1. 山东大学岩土与结构工程研究中心,山东济南 250061; 2. 聊城大学建筑工程学院,山东聊城 252059

基金项目: 国家自然科学基金项目（41172268,51279093）

详细信息

作者简介:
张绪涛(1980- ),男,博士研究生,主要从事岩土工程方面的研究工作。E-mail: zhangxutao@lcu.edu.cn。

计量
- 文章访问数: 304
- HTML全文浏览量: 2
- PDF下载量: 378
出版历程
- 收稿日期: 2013-11-25
- 发布日期: 2014-07-24

Development and application of geotechnical direct tension test devices

1. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China; 2. School of Architecture and Engineering, Liaocheng University, Liaocheng 252059, China

摘要

摘要: 针对现有土工直接拉伸试验装置的不足,研制了一套卧式直接拉伸试验装置;装置由拉伸加载系统、数字液压伺服控制系统、数据采集分析系统3部分组成。试验装置可开展多种易成型材料的直接拉伸试验,能精确测试材料的抗拉强度并能给出拉应力-应变曲线;巧妙设计了加载夹具解决了试验材料与拉伸装置的连接难题;能精确连续控制试验拉力,并能获得材料抗拉强度峰后段的拉应力-应变曲线。使用新研制的试验装置开展了黏土、铁晶砂相似材料和水泥砂浆的直接拉伸试验,试验结果表明：在黏土直接拉伸试验所涉及的含水率范围内,当干密度保持不变时,黏土的抗拉强度随含水率的增加逐渐降低,而峰值拉应变则随含水率的增加逐渐增加;黏土达到峰值强度后,并不会突然断裂而是存在一个软化段,此时土体仍然具有一定的承载能力;铁晶砂相似材料的抗拉强度随着松香酒精溶液浓度的增加而提高;随灰砂比的提高,水泥砂浆的抗拉强度和拉伸弹性模量均相应提高。
- 单轴直接拉伸试验 /
- 试验装置 /
- 抗拉强度 /
- 拉应力-应变曲线
Abstract: In view of the deficiency of the existing geotechnical tension test devices, a set of horizontal direct tension test device is developed. The test device consists of tensile loading system, digital control hydraulic system and data acquisition analysis system. Using the test device, direct tension tests on easy formation materials can be carried out, and tensile strength and tensile stress-strain curve can be precisely obtained. The loading clamp of device can solve the connection problem between the test specimen and the tensile device. The test device can control test tension continuously and accurately. The post-peak tensile stress-strain curve of materials can be obtained. Using this test device, direct tension tests on clay, iron crystal sand similar materials and cement mortar are carried out. The results show that the tensile strength of clay decreases with its moisture content linearly and the peak tensile strain of clay increases with its moisture content linearly when the dry density of clay remaines unchanged. When the tensile stress of clay reaches the peak stress, the clay specimen will not be destroied suddenly. At this time, the clay specimens still have bearing capacity. The tensile strength of iron crystal sand similar materials will rise as the concentration rosin alcohol solution increases. As the cement-sand ratio increases, the tensile strength and tensile modulus of elasticity of cement mortar will increase accordingly.
- uniaxial direct tension test /
- test device /
- tensile strength /
- tensile stress-strain curve

HTML全文

参考文献(21)

[1]	李广信. 高等土力学[M]. 北京: 清华大学出版社, 2004. (LI Guang-xin. Advanced soil mechanics[M]. Beijing: Tsinghua University Press, 2004. (in Chinese))
[2]	吴媚玲. 水工建筑物[M]. 北京: 清华大学出版社, 1991. (WU Mei-ling. Hydraulic structures[M]. Beijing: Tsinghua University Press, 1991. (in Chinese))
[3]	贾坚. 室内水泥土抗拉强度的测试方法及若干探讨[J]. 上海地质, 1999(2): 48-59. (JIA Jian. The test method of tensile strengths of the laboratory cement-mixed soil[J]. Shanghai Geology, 1999(2): 48-59. (in Chinese))
[4]	AJAZ A, PARRY R H G. Stress-strain behaviour of two compacted clays in tension and compression[J]. Géotechnique, 1975, 25(3): 495-512.
[5]	AZMATCH T F, SEGO D C, ARENSON L U, et al. Tensile strength and stress-strain behaviour of Devon silt under frozen fringe conditions[J]. Cold Regions and Technology, 2011, 68(1/2): 85-90.
[6]	FANG H Y, CHEN W F. Further study of double-punch test for tensile strength of soils[C]// Proc 3rd Southeast Asian Conf Soil Eng. USA: Published by Southeast Asian Society of Soil Engineering, 1972: 211-215.
[7]	BARZEGAR A R, OADES J M, RENGASAMY P, et al. Tensile strength of dry, remoulded soils as affected by properties of the clay fraction[J]. Geoderma, 1995, 65: 93-108.
[8]	李广信, 陈轮, 郑继勤, 等. 纤维加筋黏性土的试验研究[J]. 水利学报, 1995(6): 31-36. (LI Guang-xin, CHEN Lun, ZHENG Ji-qin, et al. Experimental study on fiber-reinforced cohesive soil[J]. Journal of Hydraulic Engineering, 1995(6): 31-36. (in Chinese))
[9]	张小江, 周克骥, 周景星. 单轴静动拉压试验仪的研制和纤维加筋土断裂特性试验[J]. 大坝观测与土工测试, 1997, 21(4): 35-38. (ZHANG Xiao-jiang, ZHOU Ke-ji, ZHOU Jing-xing. Development of uniaxial static-cyclic apparatus and experimental study on the fracture properties of fabric reinforced cohesive soil[J]. Dam Observation and Geotechnical Tests, 1997, 21(4): 35-38. (in Chinese))
[10]	骆亚生, 邢义川. 黄土的抗拉强度[J]. 陕西水力发电, 1998, 14(4): 6-10. (LUO Ya-sheng, XING Yi-chuan. Tensile strength characteristics of loess[J]. Journal of Shaanxi Water Power, 1998, 14(4): 6-10. (in Chinese))
[11]	党进谦, 张伯平, 熊永. 单轴土工拉伸仪的研制[J]. 水利水电科技进展, 2001, 21(5): 31-32. (DANG Jin-qian, ZHANG Bo-ping, XIONG Yong. Development of earthwork elongation apparatus[J]. Advances in Science and Technology of Water Resources, 2001, 21(5): 31-32. (in Chinese))
[12]	党进谦, 李靖, 张伯平. 黄土单轴拉裂特性的研究[J]. 水力发电学报, 2001(4): 44-48. (DANG Jin-qian, LI Jing, ZHANG Bo-ping. Uniaxial tension crack characteristics of loess[J]. Journal of Hydroelectric Engineering, 2001(4): 44-48. (in Chinese))
[13]	张辉, 朱俊高, 王俊杰, 等. 击实砾质土抗拉强度试验研究[J]. 岩石力学与工程学报, 2006, 25(增刊2): 4186-4190. (ZHANG Hui, ZHU Jun-gao, WANG Jun-jie, et al. Experimental study on tensile strength of compacted gravel soil[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(S2): 4186-4190. (in Chinese))
[14]	朱俊高, 梁彬, 陈秀鸣, 等. 击实土单轴抗拉强度试验研究[J]. 河海大学学报(自然科学版), 2007, 35(2): 186-190. (ZHU Jun-gao, LIANG Bin, CHEN Xiu-ming, et al. Experimental study of uniaxial tensile strength of compacted soils[J]. Journal of Hohai University(Natural Sciences), 2007, 35(2): 186-190. (in Chinese))
[15]	张云, 王惠敏, 鄢丽芬. 击实黏土单轴拉伸特性试验研究[J]. 岩土力学, 2013, 34(8): 2151-2157. (ZHANG Yun, WANG Hui-min, YAN Li-fen. Test research on tensile properties of compacted clay[J]. Rock and Soil Mechanics, 2013, 34(8): 2151-2157. (in Chinese))
[16]	吕海波, 曾召田, 葛若东, 等. 胀缩性土抗拉强度试验研究[J]. 岩土力学, 2013, 34(3): 615-620. (LÜ Hai-bo, ZENG Zhao-tian, GE Ruo-dong, et al. Experimental study of tensile strength of swell-shrink soils[J]. Rock and Soil Mechanics, 2013, 34(3): 615-620. (in Chinese))
[17]	冉龙洲, 宋翔东, 唐朝生. 干燥过程中膨胀土抗拉强度特性研究[J]. 工程地质学报, 2011, 19(4): 620-625. (RAN Long-zhou, SONG Xiang-dong, TANG Chao-sheng. Laboratorial investigation on tensile strength of expansive soil during drying[J]. Journal of Engineering Geology, 2011, 19(4): 620-625. (in Chinese))
[18]	张强勇, 李术才, 李勇, 等. 地下工程模型试验新方法、新技术及工程应用[M]. 北京: 科学出版社, 2012. (ZHANG Qiang-yong, LI Shu-cai, LI Yong, et al. New techniques and application of geomechanical model test[M]. Beijing: Science Press, 2012. (in Chinese))
[19]	张强勇, 李术才, 郭小红. 铁晶砂胶结新型岩土相似材料的研制及其应用[J]. 岩土力学, 2008, 29(8): 2126-2130. (ZHANG Qiang-yong, LI Shu-cai, GUO Xiao-hong. Research and development of new typed cementitious geotechnical similar material for iron crystal sand and its application[J]. Rock and Soil Mechanics, 2008, 29(8): 2126-2130. (in Chinese))
[20]	张强勇, 陈旭光, 林波. 深部巷道围岩分区破裂三维地质力学模型试验研究[J]. 岩石力学与工程学报, 2009, 29(8): 1757-1766. (ZHANG Qiang-yong, CHEN Xu-guang, LIN Bo. Study of 3D geomechanical model test of zonal disintegration of surrounding rock of deep tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 29(8): 1757-1766. (in Chinese))
[21]	张强勇, 陈旭光, 张宁, 等. 交变气压风险条件下层状盐岩地下储气库注采气大学三维地质力学试验研究[J]. 岩石力学与工程学报, 2010, 29(12): 2410-2419. (ZHANG Qiang-yong, CHEN Xu-guang, ZHANG Ning,et al. Large scale three-dimensional geomechanical model test of gas injection and extraction process for salt rock gas storage under condition of alternating gas press risk[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(12): 2410-2419. (in Chinese))