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

doi:10.3969/j.issn.1000-2006.2015.03.032

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2015, Vol. 39 ›› Issue (03): 179-182.doi: 10.3969/j.issn.1000-2006.2015.03.032

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

ZHANG Chunjin¹, ZHU Feng², YANG Ping^2*, HE Wenlong²

1. Ningbo Subway Construction Co., Ltd., Ningbo 315010, China;
2. College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China

Online:2015-05-30 Published:2015-05-30

Abstract

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.

CLC Number:

P642

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.

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

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