Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (2): 613-620.doi: 10.13229/j.cnki.jdxbgxb20181147

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Dynamic resilient modulus for unsaturated clay soils considering effect of limited moisture content fluctuation

Jian-ming LING1(),Hui CHEN1,Jin-song QIAN1(),Ding ZHOU2   

  1. 1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China
    2.Shanghai Urban Construction Design & Research Institute, Shanghai 200125, China
  • Received:2018-11-19 Online:2020-03-01 Published:2020-03-08
  • Contact: Jin-song QIAN E-mail:jmling@tongji.edu.cn;qianjs@tongji.edu.cn

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Abstract:

The resilient modulus (MR) is an important parameter to characterize the elastic support performance of subgrade. MR is significantly affected by subgrade limited moisture content fluctuation after traffic opening. Soil-water characteristic curve (SWCC) tests were conducted to investigate the relationship between MR and degree of saturation of the compacted and unsaturated clay soils. Repeated load triaxial (RLT) tests were carried out to obtain MR under three moisture conditions: different moisture contents, drying or wetting path and different moisture fluctuations, to investigate the correlation between MR and matric suction. The prediction model of MR under moisture fluctuation was proposed based on the matric suction. Test results show that the MR has a good non-linear relationship with matric suction. The MR of the drying path is greater than that of wetting path under the same moisture content. With the number of moisture fluctuations increases, the dynamic MR can be firstly decreased by 23%~37% when the moisture fluctuation is 1~2 times, then MR gradually stabilizes. The influence of the frequency and amplitude of moisture fluctuation on the dynamic MR can be considered simultaneously in the proposed prediction model, and the model has higher predicting accuracy compared with the models depend on degree of saturation.

Key words: road and railway engineering, clay soil, resilient modulus, matric suction, limited moisture fluctuation, reduction factor

CLC Number: 

  • TU411

Fig.1

SWCC tests"

Table 1

Test results of SWCC"

基质吸力/kPa饱和度/%
4872.13
10356.90
14248.99
20343.94
25840.45
30437.84
35835.80

Fig.2

Fitting results of test data of SWCC"

Fig.3

Upside seepage wetting method"

Fig.4

Oven dehydration method"

Fig.5

Diagram of moisture contents in drying or wetting path"

Fig.6

Diagram of moisture contents under limited humidity fluctuation"

Fig.7

Curves of resilient modulus vs. matric suction"

Fig.8

Resilient modulus under wetting and drying pathes"

Fig.9

Relationship between number of humidity fluctuations and resilience modulus when amplitude is ±2%"

Fig.10

Relationship between number of humidity fluctuations and resilience modulus when amplitude is ±4%"

Table 2

Regression analysis results for prediction models"

模型k1k2k3k4R2
文献[26]1.687-0.823-1.251-0.0120.76
本文2.284-0.059-0.027-0.95

Table 3

Regression analysis results for prediction models"

模型k1k2k3k4R2
文献[26]2.152-0.832-3.805-0.0030.86
本文27.451-0.053-0.840-0.95

Fig.11

Measured η versus predicted η values"

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