摘要
目前国内尚没有关于浅层地下水中甲烷气体调查及危险性评价的技术性规范,上海及周边地区工程建设遇到此问题时,一般采用钻孔测气体压力的方法对其发育情况进行评估。本文通过安装监测井,分析土壤和多层地下水样本结合的方法,对典型研究区内的浅层甲烷气体进行分布调查;参照美国相关标准对浅层甲烷进行了风险评估,从量化角度分析影响场地甲烷再生成的各种因素,并评估场地施工及运营期间可能因甲烷气体暴露所造成的危害,提出了相应的防治措施。
P.R.China does not presently have action levers addressing methane in groundwater of subsoil.When this issue is met with during construction in Shanghai and neighbouring area,borehole drilling and air pressure detection are generally used to assess the ground methane.Through monitoring well installation,soil and groundwater analysis and in-situ detect,the distribution of methane in this typical research area have been identified;referred to Technical measures for the investigation and mitigation of fugitive methane hazardous areas of coal mining-prepared by the Office of Surface Mining Reclamation and Enforcement,this paper provided a risk assessment on ground methane,and evaluated quantitatively the possibility of methanogenesis.Then presented the several kinds of risk related to ground methane during construction and post-development.
