| 1. | Gravelly - sand over an iron - pan and gravel layer
沙砾覆于铁质土层与砂砾层之上。 |
| 2. | Boring technology for pile foundation with deep gravel layer
高速公路深厚卵砾石层桩基成孔技术 |
| 3. | Study on stability of percolation of sandy gravel layer of xiaolangdi dam foundation
小浪底大坝坝基砂砾石层渗透稳定性研究 |
| 4. | Fast drilling technology on deep overburden gravel layer in treatment of coal gob area
采空区治理工程中深覆盖厚卵砾石层钻进施工 |
| 5. | Moreover , this article also discussed how the variation of relative density and average grain diameter influenced the shear stress of sand and gravel layer
另外，顺便探讨了相对密度、平均粒径对砂砾石层剪应力的敏感度。 |
| 6. | Gravel layer is a usual complex instable formation in drilling engineering . there are some basic features such as looseness of structure , increment , unequal sized grain . it is commonly to form discrete single - grained structure
在三个计算式的基础上采用visualbasic编制了潜孔锤同心跟管钻进风量、风压计算及空压机选型程序。 |
| 7. | Abstract : the paper presented a kind of drilling hole method that adopted direct circulation and percussion drilling , casing and cliff - protection by mud . the method applied in the complex gravel layer which has the trend to emerge cave - in and drop from the drilling wall
文摘:介绍一种在砂卵石地层层厚复杂、孔壁易掉块、易坍塌的钻孔的成孔方法? ?正循环回转与冲击钻进、套管与泥浆护壁成孔。 |
| 8. | The university was pro - active in making the well - being of the flame tree outside the station an important consideration in the improvement project . strict supervision was in place during the work so that the tree would not be affected . a gravel layer was added to provide protection for the root area of the tree
大学积极保育火车站外的一株凤凰木，该树亦被列入改善工程的重要考虑因素，严格监控在施工期间凤凰木不会受到工程影响，并特别用疏水石堆成保护层，保护凤凰木的根部。 |
| 9. | To determine if the dam base been liquefied through contrasting the shear stress which caused sand and gravel layer liquefied measured from indoor dynamic triaxial teat with calculated shear stress caused by earthquake in different depth of sand and gravel layer . and according to result of comparison to direct the design scheme of dam base
根据室内系统的动三轴试验测定的砂砾石层液化所需的剪应力与计算的砂砾石层中不同深度处由地震引起的剪应力相对比，从而最终判定坝基是否液化，并根据该结论指导了坝基设计处理方案。 |
| 10. | Under the function of big pressure and dynamic load , the grains may be moved which may cause the soil body distortion . at present , the relatively ripe methods of drill in gravel layer are mostly double - wall drill pipe reverse circulation drilling , auger stem breast wall drilling and down - the - hole hammer follow down drilling
论文根据jsl ? 30型砾石钻机潜孔锤同心跟管钻具结构,采用程序计算得到了钻杆内各深度处压力分布、钻头压力降、环形空间压力分布及空气流速分布。 |
