Investigation on relationship between P-wave velocity and B-value by bender element tests

被引：0
|
作者：
Gu X.-Q. [1 ,2 ]
Zuo K.-L. [1 ,2 ]
Gao G.-Y. [1 ,2 ]
机构：
[1] Department of Geotechnical Engineering, Tongji University, Shanghai
[2] Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2020年 / 42卷
关键词：
Bender element; Degree of saturation; P-wave velocity; Pore water pressure coefficient; Porous medium;
D O I：
10.11779/CJGE2020S1030
中图分类号：
学科分类号：
摘要：
The P-wave velocity Vp and the pore water pressure coefficient B in saturated soils are measured by bender element system in a GDS stress path triaxial apparatus. The evolution of P-wave signals with saturation and the effects of fluid type (tap water or de-aired water), clay content and different soil types on the relationship between Vp and B-value are considered. It is concluded that when the fluid is de-aired water or B-value reaches a certain value, the P-wave signal is composed of two parts. The first part has a smaller amplitude but a higher frequency than the second part. The first part is not affected by the effective confining pressure and the initial polarization direction of the input wave, and therefore it can be deduced as P1 wave. When the fluid is de-aired water, Vp is independent of B-value and the maximum wave velocity is constant. When the fluid is tap water, the relationship between Vp and B-value is consistent with the theoretical prediction in general when the B-value is small. When the B-value becomes large, the difference between the measured Vp and the theoretical value becomes larger. Besides, the maximum Vp in soil is greater than that in pure water, which is independent of clay content and soil type. © 2020, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
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页码：151 / 155
页数：4
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