摘要
隧道建设引起地下水流场改变,对区域水分运移过程造成严重影响.以重庆市中梁山岩溶槽谷为例,于2017年4月~2019年4月收集降水、土壤水、地下水和隧道排水,利用氢氧稳定同位素分析隧道影响区和非隧道影响区的土壤水和地下水运移过程,探索隧道建设对其产生的影响.结果表明:隧道影响区土壤水δ^(2)H和δ^(18)O变化幅度较非隧道影响区土壤水剧烈,地下水δ^(2)H和δ^(18)O变化幅度较非隧道影响区地下水更平稳;与非隧道影响区的土壤水和地下水相比,隧道影响区浅层土壤水δ^(2)H和δ^(18)O夏季偏重,深层土壤水δ^(2)H和δ^(18)O秋季偏重,浅层岩溶泉水δ^(2)H和δ^(18)O四季均偏重,地下河水δ^(2)H和δ^(18)O冬季偏重,其余季节各水体的δ^(2)H和δ^(18)O偏轻;隧道影响区和非隧道影响区水体平均滞留时间和"新水"比例差异从土壤水到地下水逐渐减小,隧道影响区土壤水滞留时间较非隧道影响区土壤水少25.4 d,"新水"比例高13.5%,地下水滞留时间少16.1 d,"新水"比例高3.4%.隧道建设一定程度上加快了隧道影响区水分运移速度,造成土壤层中滞留水分减少,水分混合作用减弱,导致地下水混合作用更加显著.
The construction of the tunnel caused changes in the groundwater flow field,which seriously affected the process of regional water migration.Taking the karst trough of Zhongliang Mountain in Chongqing as an example,we collected precipitation,soil water,groundwater and tunnel drainage from April 2017 to April 2019.This study used stable hydrogen and oxygen isotopes to analyze the soil water and groundwater migration processes in the tunnel‐affected zone and non‐tunnel‐affected zone,and explored the impact of tunnel construction on it.The results showed that the change ofδ^(2)H and δ^(18)O of soil water in the tunnel‐affected area was greater than that of the tunnel‐affected area,and the change of groundwaterδ^(2)H andδ^(18)O was more stable than that of the non‐tunnel‐affected area.Compared with the soil water and groundwater in the non‐tunnel‐affected area,theδ^(2)H andδ^(18)O of the shallow soil water in the tunnel‐affected area were heavier in summer,theδ^(2)H andδ^(18)O of deep soil were heavier in autumn,theδ^(2)H andδ^(18)O of shallow karst spring water were basically heavier in all seasons,and the underground river water wasδ^(2)H andδ^(18)O tends to be heavier in winter,and theδ^(2)H andδ^(18)O of water bodies in other seasons were basically lighter.The difference of meantransit time and young water fraction between the tunnel‐affected zone and the non‐tunnel‐affected zone gradually decreased from soil water to groundwater.The meantransit time of soil water in the tunnel‐affected area was 25.4 days shorter than that in the non‐tunnel‐affected area,the young water fraction was 13.5%higher,the meantransit time of groundwater was 16.1 days less,and the young water fraction was 3.4%higher.To sum up,the tunnel construction accelerated the water movement speed in the tunnel‐affected zone to a certain extent,resulting in the reduction of retained water in the soil layer and the weakening of water mixing.
作者
邱菊
蒋勇军
吕同汝
茆杨
吴泽
马丽娜
汪啟容
张彩云
Qiu Ju;Jiang Yongjun;Lv Tongru;Mao Yang;Wu Ze;Ma Lina;Wang Qirong;Zhang Caiyun(Chongqing Key Laboratory of Karst Environment,School of Geographical Sciences,Southwest University,Chongqing 400715,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2022年第2期717-728,共12页
Earth Science
基金
国家重点研发计划项目(No.2016YFC0502306)
重庆市自然科学基金项目(Nos.cstc2019yszx-jcyjx002,cstc2020yszx-jcyjx006)。
关键词
氢氧稳定同位素
水分运移
隧道建设
岩溶槽谷区
水文地质
stable hydrogen and oxygen isotopes
water movement
tunnel construction
Karst trough valley
hydrogeology
