sand seam

Appliance of Shoving and Wedge in Kaolin Clay Flow Sand Seam

撞楔在高岭土矿过流砂层中的应用

Research on the Mining on the Coal Face without Sand Control Seam under the Poor Water-Content Loose Aquiclude

双层含水层系统的数值计算方法弱松散含水层下无防砂保护层开采研究

Special geological conditions including karst cave, flow sand seam and underground river are encountered during construction of railway and highway engineering.

在公路铁路基础建设工程中，常会遇见溶洞、流砂层、地下暗河等特殊地质情况。

The rock mass structure can be expressed by rock stratum effect thickness influence coefficient. It is more scientific then using roof rock and sand content in the study of coal seam gas preservation.

研究表明，煤层围岩岩体结构控制了煤层瓦斯的赋存，岩体结构可用岩层效应厚度影响系数来表示，应用这一参数研究煤层瓦斯赋存比用煤层顶板岩性及含砂率更科学。