Backfill is increasingly used in underground mines worldwide. Its successful application depends on the stability of the barricades built at the base of the stopes to hold the backfill in place, which in turn depends on the knowledge of the pore water pressure (PWP) and stresses during, or shortly after, the placement of the slurried backfill. Until now, self-weight consolidation is usually considered for the estimation of the PWP. There is no solution available to evaluate the total and effective stresses during, and shortly after, the filling operation. As excess PWP can simultaneously be generated (increased) and dissipated (decreased) during the backfilling operation, effective stresses can develop when the filling rate is low and/or hydraulic conductivity of the backfill is high. The arching effect has to be considered to evaluate the effective and total stresses in the backfilled stopes. In this paper, a pseudo-analytical solution is proposed to evaluate the effective and total stresses in backfilled stopes during the backfill deposition on a permeable base, by considering the self-weight consolidation and arching effect. The proposed solution is validated by numerical results obtained by Plaxis2D. A few sample applications of the proposed solution are shown.

目的 土-膨润土隔离墙的水力特性可通过孔压静力触 探试验进行评价。本文旨在研究土-膨润土隔离墙 中孔压消散试验产生非单调孔压消散曲线的原 因,并对现有计算固结系数与渗透系数的方法在 土-膨润土隔离墙中的适用性进行分析。

Nanopores are prevalent within various clay morphologies, and water flow in clay nanopores is significant for various engineering applications. In this stu