Combined with practical construction works in the double line engineering of Xiang-Yu railway(Chengdu railway bureau section),the construction scheme of blasting engineering is introduced.Further introduction is also made on the construction steps,blasting system setting,safety design,operation protection and on-site inspection for blasting construction.Practice show this blasting scheme is practicable,efficient,safe and reliable.

By introducing the characteristics,the equipment,and the construction methods of conduit jacking method and the guide boring method, the paper illustrates the application of the trenchless technology in natural gas pipeline,analyzes the economic benefits of the trenchless technology construction,and points out its advance and advantages,as well as better social and economic benefits.

City life garbage refers to solid waste which comes from everyday llfe or actives which provide services for city daily life ,as well as legal and administrative provisions as city living garbage.With the acceleration of Chinas urbanization process and the improvement of people's living standards,Municipal solid waste is to grow at a rate of between 8% and 10% each year,if the garbage problem is not solved properly,it will be restricted the development of Lanzhou.Based on studying the lanzholu city gar- bage disposal in the present situation and analyzing the exiting problems,according to the characteristic of the city garbage in Lanzhou,propose the treating method of the city garbage in Lanzhou:the city garbage in Lanzhou should pursue the system of cat- egorized collection,and should move from the single sanitary landfill treatment toward the resources comprehensive treatment.

Based on theoretical analysis,a new process to treat municipal wastewater——high-loading adsorption biodegradation regeneration process is reported in this paper.This process can remove pollutants mainly by flocculation,adsorption and biological metabolism function and the former two functions are predominant.The municipal wastewater full-scale test results show that the process can increase the removal rates of SS,COD,SCOD,BOD and other pollutants in wastewater.It is a feasible method for arid and water-deficient areas to realize sewage recycle in northwest China.

Based on theory analysis,a new process to treat municipal wastewater-High-Loading Adsorption Biodegradation Regeneration process is reported in this paper.This process can remove pollutant mainly by flocculation,adsorption and biological metabolism function and the former two functions are predominant.The results of full-scale test on municipal wastewater results show that the process can increase the removal rates of SS,COD,SCOD,BOD and other pollutants in wastewater.It is a feasible method for arid and areaes lacking of water to realize sewage recycle utilization in the Northwest China.

采用高负荷生物吸附再生工艺处理城市污水,通过在庆阳市的生产性试验研究,结果表明,该工艺能有效去除水中较多的污染物;对实现西北干旱缺水地区污水资源化利用是切实可行的方法.