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Post-liquefaction behavior of natural pumiceous sands
Abstract Pumice particles are volcanic soils which are highly crushable, compressible and lightweight, due to their vesicular nature. After a series of volcanic eruptions in the North Island of New Zealand and due to flooding and erosion, some pumice particles have become mixed with hard-grained materials and have been distributed over some parts of the Waikato Basin; these mixtures are referred to herein as natural pumiceous (NP) sands. The post-liquefaction behavior of NP sands is important not only for the purpose of investigating ground deformation induced by liquefaction but also for assessing the impact of these deformations on buried structures. For this purpose, reconstituted NP sands were obtained from three sites along the Waikato River in order to perform multi-stage triaxial testing. Three parameters – initial Young's modulus (E 1), Young's modulus at recovery (E 2) and recovery strain (Ɛ r) – were used to express the stress–strain behavior of NP sands that had undergone liquefaction. For comparison purpose, similar tests were performed on hard-grained Toyoura sand. The liquefied NP sands recovered their strength at a considerably lower strain level than Toyoura sand due to the formation of stable soil skeleton during cyclic loading and the high angularity of the pumice particles. In addition, the E 1 values of liquefied NP sands were higher than those of Toyoura sand while the values of E 2 were lower; such differences in the stress-strain behavior of liquefied NP sands can be attributed to the unique characteristics of pumice components, i.e. their irregular particle shape and crushability features.
Highlights Natural pumiceous (NP) sands had irregular surface texture. NP sands experienced particle crushing during multistage triaxial testing. Post-liquefaction behavior of NP sand was different from that of Toyoura sand. Liquefied NP sands recovered their strength at a considerably smaller strain level compared with Toyoura sand. The E 1 values of NP sands were higher than Toyoura sand while, the values of E 2 were lower.
Post-liquefaction behavior of natural pumiceous sands
Abstract Pumice particles are volcanic soils which are highly crushable, compressible and lightweight, due to their vesicular nature. After a series of volcanic eruptions in the North Island of New Zealand and due to flooding and erosion, some pumice particles have become mixed with hard-grained materials and have been distributed over some parts of the Waikato Basin; these mixtures are referred to herein as natural pumiceous (NP) sands. The post-liquefaction behavior of NP sands is important not only for the purpose of investigating ground deformation induced by liquefaction but also for assessing the impact of these deformations on buried structures. For this purpose, reconstituted NP sands were obtained from three sites along the Waikato River in order to perform multi-stage triaxial testing. Three parameters – initial Young's modulus (E 1), Young's modulus at recovery (E 2) and recovery strain (Ɛ r) – were used to express the stress–strain behavior of NP sands that had undergone liquefaction. For comparison purpose, similar tests were performed on hard-grained Toyoura sand. The liquefied NP sands recovered their strength at a considerably lower strain level than Toyoura sand due to the formation of stable soil skeleton during cyclic loading and the high angularity of the pumice particles. In addition, the E 1 values of liquefied NP sands were higher than those of Toyoura sand while the values of E 2 were lower; such differences in the stress-strain behavior of liquefied NP sands can be attributed to the unique characteristics of pumice components, i.e. their irregular particle shape and crushability features.
Highlights Natural pumiceous (NP) sands had irregular surface texture. NP sands experienced particle crushing during multistage triaxial testing. Post-liquefaction behavior of NP sand was different from that of Toyoura sand. Liquefied NP sands recovered their strength at a considerably smaller strain level compared with Toyoura sand. The E 1 values of NP sands were higher than Toyoura sand while, the values of E 2 were lower.
Post-liquefaction behavior of natural pumiceous sands
Asadi, Mohammad Sadeq (author) / Orense, Rolando P. (author) / Asadi, Mohammad Bagher (author) / Pender, Michael J. (author)
Soil Dynamics and Earthquake Engineering ; 118 ; 65-74
2018-12-09
10 pages
Article (Journal)
Electronic Resource
English
Post-liquefaction behavior of natural pumiceous sands
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