TY - JOUR

T1 - Undrained cyclic behaviors of fiber-reinforced calcareous sand under multidirectional simple shear stress path

AU - Zhou, Lin

AU - Chen, Jian Feng

AU - Zhuang, Xiao Ying

N1 - Funding Information: National Natural Science Foundation of China, Grant/Award Number: 41772289. Funding Information: The authors appreciate the financial support provided by the National Natural Science Foundation of China (NSFC) (Grant Nos. 41772289 & 41572266).

PY - 2023/6

Y1 - 2023/6

N2 - A series of monotonic and multidirectional cyclic simple shear tests were performed on reconstituted fiber-reinforced calcareous sand specimens prepared by the dry deposition method, at a relative density of approximately 50%, considering the effects of fiber contents and cyclic stress levels. The peak shear strength, the linkage between monotonic and cyclic behaviors, liquefaction resistance, and pore pressure responses of calcareous sand with and without fiber reinforcement were analyzed. The results indicate that both unreinforced and fiber-reinforced calcareous sand exhibit limited flow instability behavior and the peak shear strength increases with the increase in fiber content under monotonic loading. The inclusion of fibers and increasing fiber contents can improve the liquefaction resistance of calcareous sand under cyclic loading. A linear relationship was found between the normalized liquefaction resistance of reinforced sand and the number of cycles for triggering liquefaction, and the prediction of liquefaction resistance of fiber-reinforced calcareous sand with various fiber contents can be conveniently achieved according to the linear relationship. The pore pressure prediction model considering the effect of fiber contents was proposed, which was capable of effectively simulating the pore pressure generation of fiber-reinforced calcareous sand.

AB - A series of monotonic and multidirectional cyclic simple shear tests were performed on reconstituted fiber-reinforced calcareous sand specimens prepared by the dry deposition method, at a relative density of approximately 50%, considering the effects of fiber contents and cyclic stress levels. The peak shear strength, the linkage between monotonic and cyclic behaviors, liquefaction resistance, and pore pressure responses of calcareous sand with and without fiber reinforcement were analyzed. The results indicate that both unreinforced and fiber-reinforced calcareous sand exhibit limited flow instability behavior and the peak shear strength increases with the increase in fiber content under monotonic loading. The inclusion of fibers and increasing fiber contents can improve the liquefaction resistance of calcareous sand under cyclic loading. A linear relationship was found between the normalized liquefaction resistance of reinforced sand and the number of cycles for triggering liquefaction, and the prediction of liquefaction resistance of fiber-reinforced calcareous sand with various fiber contents can be conveniently achieved according to the linear relationship. The pore pressure prediction model considering the effect of fiber contents was proposed, which was capable of effectively simulating the pore pressure generation of fiber-reinforced calcareous sand.

KW - Calcareous sand

KW - Fiber

KW - Liquefaction resistance

KW - Multidirectional simple shear tests

KW - Peak shear strength

KW - Pore pressure

UR - http://www.scopus.com/inward/record.url?scp=85145834509&partnerID=8YFLogxK

U2 - 10.1007/s11440-022-01780-6

DO - 10.1007/s11440-022-01780-6

M3 - Article

AN - SCOPUS:85145834509

VL - 18

SP - 2929

EP - 2943

JO - Acta geotechnica

JF - Acta geotechnica

SN - 1861-1125

IS - 6

ER -