矿区煤矸石山周围土壤重金属分布规律研究

对某矿区矸石山及周围土壤五种重金属(Cr、Cd、Cu、Pb、Zn)总量进行测定,结果显示,两个矿区矸石中五种重金属含量均高于当地背景值,同时受矸石山影响,矸石山周围土壤重金属含量也都不同程度地超出背景值,即重金属对土壤产生不同程度的污染。数据分析结果表明,矸石山周围土壤中的重金属平面与剖面分布具有一定的规律特征:土壤重金属含量的大小与土壤距离矸石山的远近有关;同时重金属的分布受气候及其它影响而呈现了一定的波动性特征。

Static mechanics analysis of no bumping no vibration welding structure with double-inclined surface for high-speed & heavy-load CWR

It is known from our former theoretical analysis that the single-inclined welding surface which is inclined towards the transverse direction of the rail can only eliminate vertical bumping, and the single-inclined welding surface which is inclined towards the vertical direction of the rail can only eliminate lateral vibration. In this paper, we put forward a welding structure of double-inclined welding surface to eliminate the vertical bumping and lateral vibration at the same time, and analyze the stress state of continuous welded rail (CWR) by combining geometrical azimuth. Furthermore, the increase of bearing capacity of CWR with the double-inclined welding surface is theoretically analyzed.