Beijing Subway Project Impact Assessment Of The Introduction Of Groundwater - Underground, Subway

The relevant department, and has built subway lines compared to the Beijing subway

now under construction on groundwater resources in greatly reduced the consumption of more than Qi Cheng, and works on the impact of groundwater is becoming a Beijing subway construction assessment of one of the elements.

Not long ago, Beijing Geotechnical Institute, Beijing University and Beijing Railway Transportation Construction Management companies have completed the "Beijing on the subway underground water planning, the impact of construction and engineering measures", the first time in Beijing subway construction impact on groundwater resources for a quantitative analysis. 3 units, through the relevant research and preliminary statistics, in February 2003 to May 2008 have been completed between the Beijing subway construction process of precipitation in the groundwater resources in the total consumption of about 248 million cubic meters, equivalent to the period of groundwater exploitation in Beijing volume of 1.7%. Preliminary estimates, in 2007 started the six new subway underground water resources consumption is about 066 million cubic meters, equivalent to 0.46% of groundwater extraction. Compared to the metro line has been completed, under construction in the 6 route is much less water consumption, reducing Qicheng more.

"We are currently under construction for six new subway line (M6, M8 2, M9, M10 2, Daxing lines, Yizhuang line) during the construction of the groundwater resource consumption were assessed." Beijing Survey and Design School project leader told reporters that the line has been completed, compared, six new subway lines start construction in the protection of water resources in the precipitation method significantly improved, such as closed to the precipitation, partial grouting and pumping, infiltration combined with other effective measures, especially for the Beijing Metro Line 9 Station to the West Military Sunrise Museum Intervals larger lots of water, take a closed well dewatering, which reduces a large extent the consumption of groundwater resources.

6 volume of the new line works great, and most subway lines to pass through water-rich zone, but the new subway sharp drop in the total consumption of groundwater resources. The person in charge explained the reasons for the reduction of groundwater consumption: different construction methods on the request of precipitation are not the same, such as the use of shield construction of the tunnel and the construction of elevated light rail line is no rainfall, can significantly save water resources. Currently under construction six new subway line construction, the shield and the elevated lines occupy a considerable proportion of both the total length and about 2 / 3.

In addition, under the specific circumstances of the tunnel depth, these lines of precipitation are required drawdown is relatively small, most of the sections are within 3 meters, local slightly larger, but less than 10 meters, and therefore, the construction process of precipitation significantly reduced the consumption of underground water resources. Meanwhile, the precipitation technique has been steadily progressing, especially in closed precipitation technologies, in the process of precipitation in the combination of blocking and scheduling, and multi-aquifer seepage under the conditions cited in the application of technology to protect groundwater resources play an important role .

by: gaga

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