Impact of loading rate and manner for the flexural strength of artificial permafrost

ZHANG Chunjin, ZHU Feng, YANG Ping, HE Wenlong

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2015, Vol. 39 ›› Issue (03) : 179-182.

PDF(1388878 KB)
南京林业大学学报（自然科学版）
PDF(1388878 KB)
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2015, Vol. 39 ›› Issue (03) : 179-182. DOI: 10.3969/j.issn.1000-2006.2015.03.032

Impact of loading rate and manner for the flexural strength of artificial permafrost

  • ZHANG Chunjin1, ZHU Feng2, YANG Ping2*, HE Wenlong2
Author information +
History +

Abstract

The impact of loading rate for the flexural strength of artificial permafrost(remodeling silty clay)in three-point and four-point loading was investigated based on laboratory experiments. The results showed that the both loading showed significant damage type of brittle failure characteristics, but the loading rate had almost no effect on the failure characteristics. The flexural strength and the maximum relative deflection at midspan were increased with loading rate linearly increasing trend when three-point loading method was adopted. When the loading rate was in the range of 30-75 N/s, the intensity increases 0.023 MPa and the maximum relative deflection at midspan increases 0.038 as the loading rate increased 1 N/s. However, the four-point loading rate did not affect its flexural strength and the maximum relative deflection at midspan damaged. From the point of studying the basic characteristics of the flexural strength of artificial permafrost, it is more reasonable to use four-point loading method for determining its flexural strength.

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations
ZHANG Chunjin, ZHU Feng, YANG Ping, HE Wenlong. Impact of loading rate and manner for the flexural strength of artificial permafrost[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2015, 39(03): 179-182 https://doi.org/10.3969/j.issn.1000-2006.2015.03.032

References

[1] 煤炭行业煤矿专用设备标准化技术委员会.MT/T 593-2011.人工冻土物理力学性能试验[S].北京:中国标准出版社,2011.
[2] 齐吉琳,马巍.冻土的力学性质及研究现状[J].岩土力学, 2010,31(1):133-143.Qi J L,Ma W. State-of-art of research on mechanical properties of frozen soils[J]. Rock and Soil Mechanics,2010,31(1):133-143.
[3] 吴成义,徐兵壮,李嘉玲.人工冻土抗弯试验研究[C]//全国矿山建设学术会议论文选集:上册,2004:61-64. Wu C Y,Xu B Z,Li J L. Bending test of artificial permafrost[C]// National Conference Papers Mine Construction Anthology:First Volume,2004:61-64.
[4] 牛富俊,夏慧民.人工冻结梁构件中不同加筋作用的对比试验研究[J].西安工程学院学报,2002,24(2):1-3.Niu F J,Xia H M. Comparative experimental study on the embedded freezine pipes reinforcement over the artificial frozen component[J]. Journal of Xi’an Engineering University,2002,24(2):1-3.
[5] 郑周练,刘长江,龚文川,等.“三点弯曲法”在线检测缆索张力力学模型[J].土木建筑与环境工程,2009,31(2):29-32.Zheng Z L,Liu C J,Gong W C,et al. Mechanical model with on-line measuring the cable tension with “three point bending” method[J]. Journal of Civil,Architectural & Environmental Engineering,2009,31(2):29-32.
[6] 刘家泳,汪尧,戈晓,等.四点弯曲试验研究[J].物理测试,2010,28(2):44-47.Liu J Y,Wang Y,Ge X,et al. Research of four-point bending test[J]. Physics Examination and Testing,2010,28(2):44-47.
[7] 陈有亮,王明,徐珊,等.上海人工冻结软黏土抗压抗拉强度试验研究[J].岩土工程学报,2009,31(7):1046.Chen Y L,Wang M,Xu S,et al. Tensile and compressive strength tests on artifical frozen soft clay in Shanghai[J]. Chinese Journal of Geotechnical Engineering,2009,31(7):1046.
[8] 赵晓东,周国庆,陈国舟.温度梯度冻结黏土破坏形态及抗压强度分析[J].岩土工程学报,2010,32(12):1854-1860.Zhao X D,Zhou G Q,Chen G Z. Failure modes and compression strength of frozen clay under thermal gradient[J]. Chinese Journal of Geotechnical Engineering,2010,32(12):1854-1860.
[9] 高丹盈,付超云,赵利梅.加载速度对塑性混凝土强度的影响[J].人民黄河, 2009, 31(6):115-116.Gao D Y,Fu C Y,Zhao L M. Impact of loading speed on the plastic concrete strength[J]. Yellow River,2009,31(6):115-116.
[10] 苏捷,方志,杨钻.混凝土抗折强度尺寸效应的试验研究[J].工业建筑, 2012,42(12):62-66.Su J,Fang Z,Yang Z. Experimental study on the size effect of concrete bending strength[J]. Industrial Construction,2012,42(12):62-66.
[11] Watanabe K,Wake T. Measurement of unfrozen water content and relative permittivity of frozen unsaturated soil using NMR and TDR[J]. Cold Regions Science and Technology,2009,59(1):34-41.
[12] 马芹永,袁璞,陈文峰,等.人工冻土单轴与围压状态冻土动力学性能对比分析[J].地下空间与工程学报,2014,10(1): 26-29.Ma Q Y,Yuan P,Chen W F,et al. Comparative analysis on dynamic mechanical properties of artificial frozen soil under uniaxial load and confining pressure[J]. Chinese Journal of Underground Space and Engineering,2014,10(1):26-29.
[13] 孙星亮.冻结粉质粘土细观变形机理及其各向异性损伤模型研究[D].武汉:中国科学院武汉岩土力学研究所,2004.Sun X L. Analysis of submacroscopic deformation mechanism of frozen silty clay and a study on its anisotropic damage models[D].Wuhan:Institute of Rock and Soil Mechanics,Chinese Academy of Sciences, 2004.
[14] Christ M,Park J B. Ultrasonic technique as tool for determining physical and mechanical properties of frozen soils[J]. Cold Regions Science and Technology,2009,58(3):136-142.
PDF(1388878 KB)

Accesses

Citation

Detail
Sections
Recommended
The full text is translated into English by AI, aiming to facilitate reading and comprehension. The core content is subject to the explanation in Chinese.

Author

Reader

Reviewer

www.nldxb.njfu.edu.cn

Edited ＆ Published by Editorial Department of Nanjing Forestry University(Natural Sciences Edition)
Address： No.159 Longpan Road,Nanjing 210037 Jiangsu,P.R.China
E-mail ：xuebao@njfu.edu.cn , xuebao@njfu.com.cn
Telephone +86-25-85428247,85427076
Distributed by China International Book Trading Corporation P.O. Box 399, Beijing ,P.R. China

/

〈 〉