Study on the Development Mode of Dynamic Pore Pressure in Layered Saturated Non-Cohesive Soil Under Impact Loading
This study aims to uncover the development modes of dynamic pore pressure in saturated non-cohesive soil layers under impact loading and its variation due to soil layer conditions.Impact tests were conducted on layered saturated soil under different soil layer conditions using a self-developed im-pact load testing device,and the characteristics of dynamic pore pressure development and soil settle-ment were analyzed.The results showed that under impact loading,the development of dynamic pore pressure in soil underwent two distinct stages:a transient response stage and a steady-state response stage,with the latter characterized by a slow followed by a rapid decline.In single-layer soil,the dy-namic pore pressure in saturated sand soil increased sharply after impact loading.With the increase of particle size,the peak pressure rose and the dissipation time shortened.In dual-layer soil,the steady-state dynamic pore pressure stage changed significantly due to permeability coefficient variations be-tween the upper and lower soil layers,markedly altering the reduction process in the lower soil layer.Presence of a relatively impermeable interlayer caused a noticeable plateau across all measuring points in the pressure reduction phase,significantly slowing the decrease rate,particularly in the soil above the impermeable layer compared to below it.With interlayers,experiments showed significant"water film"formation with non-uniform distribution,reaching up to 2cm in thickness.At the same time,each impact load resulted in noticeable soil settlement,and the extent of settlement gradually dimin-ished with subsequent impacts.
impact loadinglayered saturated soilweak permeable interlayerdynamic pore water pressuresoil settlement
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维普
