云南洱海东侧海东引水隧道地下水环境负效应影响评价

Impact assessment of negative environmental effects on groundwater in the Haidong diversion tunnel on the east side of the Erhai Sea,Yunnan Province,China

因隧道施工对地下水环境产生的负效应影响事件时有发生,严重影响了隧道的施工安全和周边地下水环境质量。本文基于AHP层次分析法和模糊综合评价法,结合西南地区地质环境背景特点对环境负效应评价体系中的各项指标进行权重选取,并对云南洱海东侧某引水隧道进行了地下水环境负效应评价。评价结果显示:云南洱海东侧某引水隧道产生的地下水环境负效应等级以Ⅲ级为主(中等),该引水隧洞在施工过程中及施工后产生的主要环境负效应为有较明显的涌突水灾害(流量<8 000 m^(3)/d),同时伴随着引水隧道附近局部地区的地下水位下降、隧道周边地表水流量的减少和凤尾箐—大成村附近泉水流量的减小。

Negative effects on the groundwater environment due to tunnel construction have occurred from time to time,seriously affecting tunnel construction safety and the quality of the surrounding groundwater environment.Based on AHP hierarchical analysis method and fuzzy comprehensive evaluation method,this paper combines the geological and environmental background characteristics of the southwest region to select the weights of the indicators in the negative environmental effect evaluation system,and evaluates the negative environmental effect of groundwater in a diversion tunnel on the east side of the Erhai Sea in Yunnan.The evaluation showed:The negative environmental effects of a diversion tunnel on the east side of Erhai Lake in Yunnan Province are mainly Ⅲ level(medium),the main negative environmental effects of the diversion tunnel during and after construction are obvious water gushing disaster(flow rate <8 000 m~3/d),at the same time,the groundwater level in some areas near the diversion tunnel decreases,the surface water flow around the tunnel decreases and the spring flow near Fengweiqing-Dacheng Village decreases.