weak coal meaning in English

脆煤

On the basis of the concept and analysis method of slope geological structure , four typical slope geological structures are selected by some investigations on more than one hundred high rock slopes in the motorway project . these structures are thick sandstone stratum , stratum including weak coal , stratum made of red or brown plastic clay and soft rock mass and stratum made of remnants rock mass . the practical slope geological structures are compact basis of geological mechanical model for the analysis of relaxation zone in high rock slope projects
在介绍了坡体结构概念并提出建立坡体结构方法的基础上，根据对京珠高速公路粤境北段路堑高边坡工程中百余处岩石高边坡的调查总结，选择了其中较为具有代表意义的厚层砂岩、煤系地层、红土地层及残坡积层路堑高边坡共4类岩石高边坡作为研究对象，为对岩石高边坡开挖松弛区的分析打下了坚实的实际地质力学模型基础。