陕京输气管道工程水土流失分析及防治措施

陕京二线输气管道工程线路长、跨度大、规模大、涉及地貌类型多,施工方式多样,造成的水土流失形式多,局部水土流失量不大但总量较大.工程在建设过程中将扰动原地表面积1 785.37 hm2,可能造成水土流失总量为77.76万t,新增流失量达65.11万t,其中弃渣流失量为45.56万t.工程跨黄土丘陵沟壑区及山地区为治理的难点和重点.水土流失防治体系由预防措施、治理措施、临时措施和水工保护4大部分组成,通过治理,生态、社会、环境效益显著.着重探讨该工程水土流失特点、成因、不同地貌、不同施工方式的水土流失强度.

Soil-water loss and control measures for No.2 Shannxi-Beijing natural gas pipeline works

The No.2 Shannxi-Beijing natural gas pipeline works is of long and large scale,involving various landforms and the multiple construction ways,causes soil-water loss in different forms.The soil-water loss is locally small,but large in total.In the construction process,the disturbed land surface area will reach 1785.37 hm~2 and the estimated soil-water loss may reach 777.6 thousand t,and newly increased soil-water loss is 651.1 thousand t,in which,the lost spoil is 455.6 thousand t.The low-relief loess terrain gullied area and mountainous area along the pipeline works are difficult and key points for soil-water loss control.The soil-water control system is composed of prevention measures,harnessing measures,temporary measures and hydraulic measures.Through harnessing,the benefits of ecology,society and environment are remarkable.This paper mainly presents the characteristics,causes,intensities of soil-water loss in different landforms caused by different construction ways.