砂砾石、土夹石应用于路基填筑受控思维

不论是砂砾石还是土夹石，只要其中含有砾石和石料，其刚度就比不舍石料要大，含石比例越高，刚度就越大。如能合理应用（严格级配，采取必要的固结板体措施等），特别是在土源缺乏时，考虑就近砂砾石取材比远运土性价比较优的情况，且如果能得到全方位严格受控施工，这两种填料均应是高速公路路基施工中较好的填筑材料。但如果得不到全方位的科学受控或受控措施不力，也有可能因这两种材料本身显著的透水性和松散性，应用效果反而会更差。

Controlled Thinking of Application of Sandy Gravel and Soil-rock in Subgrade

Whether sandy gravel or soil-rock, as long as there is gravel or rock, the stiffness of materials will be higher than the materials without rock. The higher the proportion of rock in material is, the higher the stiffness is. If the measures like controlling gradation strictly and consolidating board are used reason ably, and the construction is controlled roundly and strictly, especially when soil is lacking and considering far-carried soil has higher cost effectiveness than nearby sandy gravel, the two kinds of filling will be better materials in expressway＇s subgrade construction. But if the construetion isn＇t controlled scientifically completely or the control measures are ineffective, the application effect may be worse because of their distinct permeability of water and bulking property.