飽和細粒土の凍結融解によるアイスレンズ方向の透水係数変化 ―融解後の間隙比分布の影響―

The purpose of this study is to evaluate the influence of freezing direction on the permeability of freeze-thawed soils. In this study, the permeability of both ice lens (IL) and IL orthogonal directions in the freeze-thawed soil were experimentally investigated. As a result, the permeability of IL direction was greater than IL orthogonal direction. Especially, the permeability of open-system freeze-thawed soils increased remarkably and it received not only the overburden pressure but also the influenced of both condition of pre-consolidation pressure and the number of freeze-thaw cycles. The permeability of closed-system freeze-thawed soils was lower than that of open-system. It was concluded that the permeability of freeze-thawed soil of IL direction is greater because of the remarkably greater void ratio in the colder temperature side of freezing

学生の地域連携活動と今後の課題―食で地域の多世代をつなぐ「えんがわ家族食堂」―

2019年度に目白⼤学の学⽣が、新宿区⼾⼭地区の地域住⺠の方と共に⾷を通じた地域連携活動を実施した。⾷を通じて地域の様々な世代の方と交流する「えんがわ家族」の⾷堂事業に参画するなかで、学⽣の社会的課題への認識や、地域コミュニティ活性化の重要性ついての意識の向上が⾒られた。本稿ではその実践した取り組みについて報告する

Steady Flow to A Well in The Case of Pumping in Multi-layered Aquifers

Pumping from artesian aquifers can cause drawdowns in the aquifers. When those drawdowns are so large, a groundwater nuisance such as ground subsidence, dry of well and penetration of salt water to wells, will occasionally occur. Both to utilize groundwater efficiently and to prevent a groundwater nuisance, we need to know the hydraulic behavior of aquifers. In this paper, the linear form of the simultaneous differential equations and boundary conditions that represent a steady multi-layered leaky aquifers system in which pumpage from the aquifers is balanced, are derived. Moreover, we obtain their general solutions and take numerical calculations for various cases