Nanchang metro line 3 liantang depot access line shield tunnel section of the lower line smoothly through

August 21, nanchang metro line 3 liantang depot access line shield tunnel section of the lower line successfully completed.

Liantang depot access line shield section is located in nanchang county, nanchang city, the section from the yintriangle north station, along the direction of yingbin avenue east, under the liantang no.

The downline length of the shield tunnel section of the access section of liantang depot is 1327.958m, the minimum curve radius of the line plane in the section is 300m, and the line spacing is 10.1m ~ 14.16m. The minimum curve radius of the longitudinal section of the interval is 2000m, the V slope is adopted, and the maximum slope is about 30‰. The overburden thickness of the tunnel is 6m ~ 16.73m, and the strata traversed by the interval are mainly water-rich sand layer and silty clay layer.

The shield tunneling interval has complicated lines, with a slope of 30‰ large slope and a curve of 300m small radius on the plane. And lines in the lotus pond one playground and shallow buried under backfilling area, side in nanchang the county party committee party school of the building and construction process of shield tunneling parameters, the segment quality and land subsidence control the demand is higher, the strengthening technical clarificaiton work of shield tunneling process, through timely adjusting and optimizing parameters of shield tunneling construction, strengthen the secondary grouting and field monitoring and patrol, ensure that all risk points are passed.