Dynamics of Freezing-Thawing Soil around Subway Shield Tunnels by Zhen-Dong Cui & Zhong-Liang Zhang & Zhi-Xiang Zhan & Peng-Peng He & Chen-Yu Hou & Yan-Kun Zhang

Author:Zhen-Dong Cui & Zhong-Liang Zhang & Zhi-Xiang Zhan & Peng-Peng He & Chen-Yu Hou & Yan-Kun Zhang
Language: eng
Format: epub
ISBN: 9789811543425
Publisher: Springer Singapore

It can be seen from Fig. 4.5 that the dynamic modulus of freezing-thawing and undisturbed samples increase with the amplitudes of deviator stress increasing. The larger the CSR is, the greater the dynamic modulus reduces under the same conditions. It is related to the energy absorbed by samples under the cyclic loading. The larger plastic strain and higher excess pore water pressure of samples develop under larger deviator stress. However, the increasing energy decreases the stability of samples. Kokusho (1980) reported that the stiffness of soils did not change significantly with number of vibration when the strain amplitude was small, while the modulus would decrease significantly if the strain was large for the development of the pore water pressure. However, the results of silty clay samples are opposite in this study. The modulus decreases significantly when the strain is small for the reason that the samples are not compacted at the initial stage. With the number of vibration increasing, the increment of plastic deformation and excess pore water pressure become smaller and smaller. The samples begin to harden and easily break with the energy continuously absorbed, though the modulus changes slightly at the end of tests.

Fig. 4.5The dynamic modulus of freezing-thawing and undisturbed samples with different CSRs

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