arenaceous rock

The metamorphic rock belt in central Jiangxi Province, located in the compound terrain among the Huaxia terrain, the Yangtze terrain and the Caledonian fold zone of South China, is composed dominantly of meta argillo arenaceous rocks and small amounts of amphibolites.

赣中变质岩带主要由变泥砂质岩石和少量斜长角闪岩组成。

It was analyzed in detail how the working efficiency of ventilating-dusting system attached to the returned sand cooler influenced the moulding sand quality and castings quality, and the improving measures were also proposed.

简单介绍了K·W气流预紧实高压造型线及其通风除尘设施,详细分析了双盘冷却器通风除尘系统工作效率对型砂质量和铸件质量的影响,指出了现用通风除尘系统存在的问题,同时给出了改进措施。

Research purposes: Based on the characteristics of primary bracing stress and its deformation during the excavation of tunnel,the researches are done on the bracing rationality for sand loess tunnel and the rational bracing measures are presented for the purpose of overcoming the problem in construction of large sectional sand loess Hanguguan Tunnel.

研究目的:针对郑西客专函谷关大断面砂质黄土隧道,隧道开挖过程中初期支护受力及变形特点,进行砂质黄土隧道支护合理性的研究,提出有效的支护措施。