河南山口水库分区土石坝设计

Design of partitioned earth- rock dam of Shankou Reservoir Project

河南三门峡市山口水库复建工程料场和溢洪道开挖的土料渗透系数较大,无法满足心墙坝或者斜墙坝防渗要求。针对上述难点,设计选用了分区土石坝。该方案通过对大坝进行合理分区,将坝体分为土质防渗体区和堆石区,中间设过渡层、反滤层,并具体提出土质防渗体区土料渗透系数不得高于5×10-5cm/s,使大坝设计满足了规范的相关要求。该分区坝可以充分利用溢洪道开挖料,不仅可以减少工程弃渣量,还可以大幅降低工程投资。

Shankou Reservoir Reconstruction Project is located in Sanmenxia City, Henan Province, where the permeability of excavated soil from the quarry field and spillway is not qualified for the construction of core wall dam and inclined wall dam, so a partitioned earth rock dam is proposed. By dividing the dam into different zones reasonably, the dam body is partitioned as soil anti-seepage zone and rockfill zone, between which the transition layer and filter layer are arranged. And the soil permeability in the soil anti-seepage zone is required to be less than 5 ＆#215; 10 -5 cm/s, so as to meet the design standard. The partitioned earth rock fill dam can make full use of excavated material from spillway, which reduced the amount of engineering spoil soil and the engineering investment.