| Guiyang Urban Rail 1 line,runs through the Jinyang New Area and the old city of Guiyang.Through the main passenger corridor of Current,connecting the Old Town and New,both passenger and guide urban development,For ease traffic pressure in Guiyang,strengthening internal and external transport integration,promotion of urban development to the new city of Jinyang has significance.In the study area rich in groundwater resources,Construction of Urban Rail in the construction of groundwater enriched of Guiyang City,Particular part of the land off the assembly line,construction of major geological problems facing the geological environment is the ground water and rail projects in the interaction.Study found that underground space development and groundwater are closely related.In the process of underground space development,in order to ensure the construction safety,often to be within acertain range and drainage of groundwater,causing land subsidence,cracking and other problems.It is easy to trigger the collapse of karst activity when pumping,drainage and other engineering activities in the are of soluble rocks Distribution Such as Containing the carbonate rocks,calcareous rocks, and rocks salt. In addition,the line of the tunnel may block the flow of groundwater,or destroy the original water storage structure,resulting in high water table obstruct,thus affecting the formation of the stable and the safety of nearby buildings.Over the years in the building construction of Guiyang City,Because of Underground water resources development,groundwater environment Disturbed.the water has not only brought changes in the environment,and thus induce a lot of the environmental geological problems.The paper relies on the Research projects of "Guiyang Urban Rail Transit Line 1 Environmental Impact Assessment",Deepen the stud Hydrogeological conditions;Identified in the study area boundary of the hydrogeological;Supplement groundwater,runoff and discharge conditions,completion of hydrogeological unit;Comprehensive understanding of the Urban Rail construction methods,partition the environmental impact of Groundwater With different cycle in the Urban Rail Pass through,Confirmed the Area of influence and Affect the way;Calculate the extent of the drainage construction,Calculate the extent of drainage construction,water inflow and stations built under the same level after the traffic stop up high-value; Analog North Zhonghua Road Guiyang City examples of karst collapse,Analysis of water level may lead to the engineering problems of karst collapse;Reference to Industry standards,has determined he impact on groundwater quality On project construction and operation.Some main results obtained are as follows:(1)Comprehensive geological structure,topography,water,Lithology and groundwater discharge characteristics,The study area was divided into two one hydrogeological unit,six second hydrogeological unit.Urban Rail directly through the unit includesⅠ1:YeyaTangzi unit,Ⅱ1:Guiyang syncline subunits,Ⅱ2:Huaxi subunits;(2)Line under the Urban Rail construction methods and groundwater through the segment in which the characteristics of the study area was divided into three areas of environmental impact of groundwater;(3)In Urban Rail interval,site construction technology based on the analysis,combined with Urban Rail through the characteristics of the Urban Rail after the section and the foundation drainage,groundwater drop shadow range,the displacement calculation,the results show: over the next station,interval between discharge large construction,gushing water pumping large amount of measures to be taken to the lot;(4)In the process of the"Railway Station"construction,both internal and external causes of the double factors,impact of karst collapse induced by the surface most likely.Measures of prevention and treatment needs;(5)Obstruct the high rate of groundwater will not impact local groundwater;(6)During the Urban Rail construction and operation,the possibility of groundwater pollution in Guiyang is very small. |
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