|
|
|
| Environmental Risk Assessment of Underground Water Level Falling Induced by Construction in Mountain Tunnel |
| BAI Ming -zhou，CHEN Yun，SHI Hai |
| (Beijing Jiaotong University，Beijing 100044，China) |
|
|
|
|
Abstract Research purposes： Tunnel construction has a certain impact on the ecological environment along the line. Unreasonable excavation and drainage may cause sudden water and mud bursting，as well as groundwater drainage，dry water，surface water storage capacity reduction and others phenomena affecting the surrounding ecological environment. To quantitatively study the effect of the tunnel drainage on ecological environment，this paper takes a railway tunnel as example，considering geographical， geological， hydro - geological， and tunnel project and other relevant factors， the ecological evaluation index and grading standards are determined，as well as using Analytic Hierarchy Process to decide the weight of each index value. Finally using Fuzzy Analytic Hierarchy Process evaluates the ecological environment impact assessment on groundwater discharge. Research conclusions:(1) The risk evaluation index of the impact of the groundwater level on the ecological environment is established，and the fuzzy comprehensive evaluation method is used to evaluate the ecological environment. The results show that comprehensive evaluation index average number is 2.69， which means that groundwater seepage caused by tunnel construction and adverse impact on the ecological environment. (2 ) From the dynamic point of view， the monitoring of the groundwater level is carried out. The effect of tunnel drainage on the groundwater level decreased is revealed and the results of fuzzy comprehensive evaluation are verified. ( 3 ) The research results can provide the guidance for safe construction of mountain tunnel and the control of karat water.
|
|
Received: 25 August 2015
|
|
|
|
|
|
|
2016, Vol. 33 
