sandy gravel

基本解释

For the frozen weathered bedrock, sandy gravel and pebble bed, it is more suitable to use drilling and blasting method than to use the frozen soil excavator.
对冻结风化基岩、砂砾层或卵石层，冻土挖掘机效率低，宜采用钻眼爆破法，采用抓岩机装载冻土。
The material of the main dam shuck is mainly the local sandy gravel. The clay core and the asphalt concrete core were compared in the choosing of seepage prevention type.
拦河主坝坝壳以当地材料砂砾石为主，防渗心墙比较了粘土心墙、沥青混凝土心墙和斜墙型式。
Gulley microfacies occur as narrow bands within gravel bars and sandy gravel bars, and act as the high trans mssibility pathways for reservoirs in the root fan and inner-middle fan.
流沟以窄条带状镶嵌于砾石坝和砂砾坝之中，为扇根和扇中内带储层中的高渗通道。