Design and construction of territories subjected to karst-piping processes in Moscow

Dykhovichnyi, Yu. A.; Maksimenko, V.A.

doi:10.1007/bf01710457

Cited by 1 publication

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“…Several terms have been used in the literature to classify this seepage erosion. For instance "heave" (a substantial soil volume which is simultaneously raised by seepage flow, Terzaghi [22]), "karst-piping" (the removal of material due to weathering) [23], "hydraulic fracturing" (the process of soil being locally pushed apart by pore water pressures) [24], and the "internal erosion" (the transport of small particles through a matrix of larger ones [25,26]. the bimsoil piping phenomenon has been studied by several scholars [37][38][39][40][41][42][43][44], the study of the piping evolution process of bimsoil in laboratory test is mostly based on conventional penetration testing (e.g., constant head test) [37,38], and it is difficult to precisely control the seepage hydraulic pressure and hydraulic gradient.…”

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confidence: 99%

Seepage Piping Evolution Characteristics in Bimsoils -An Experimental Study

Wang

Zhou

et al. 2017

Water

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Abstract:Piping is a kind of seepage failure mode that commonly occurs under the influence of seepage force in soil materials. Many studies have been done to study the characteristics of piping for soil materials, however, the initiation and development mechanism of piping in bimsoils is poorly understood. In this work, an experimental program was set for investigating the evolution process of piping, in a self-developed servo-controlled flow-erosion-stress coupled testing system. All the studied samples with rock block percentage (RBP) of 30%, 40%, 50%, 60%, and 70%, were produced as a cylindrical shape (50 mm diameter and 100 mm height) by compaction tests with different hammer strike counts to roughly insure the same void ratio. The results show that the amount of rock blocks in bimsoil samples significantly influenced the initiation and development of piping. Furthermore, the stress state has a crucial influence on the critical hydraulic gradient, seepage velocity, permeability, erosion, and migration of soil particles. Moreover, interactions among soil matrix, rock blocks, and rock-soil interfaces control the seepage stability of the bimsoil sample.

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