Drilling of curtain grouting in the foundation Gallery of Baihetan Hydropower Station
on June 12, the standardized civilized construction layout acceptance of curtain grouting in the foundation Gallery of the dam foundation on the right bank of Baihetan Hydropower Station was completed and the drilling was successfully started.
the foundation curtain gallery is located on the dam body and belongs to the anti-seepage curtain of the riverbed, which is the key part of the anti-seepage treatment of the dam foundation. The total elevation of Baihetan Hydropower Station is 834m, and the foundation curtain gallery is located at the dam elevation of 558m. It forms the anti-seepage curtain on the right bank of Baihetan Hydropower Station with the six layer grouting hole of the right bank dam abutment. The specification of foundation gallery opening (clear width * clear height) is 4 × The 4.5m tunnel is arranged with three rows of curtain grouting holes. The design quantity of curtain grouting in the foundation gallery is 28180m, and the maximum grouting hole depth is 120m. At present, 8 geological drilling rigs and 4 grouting pumps are put into drilling and grouting operations
the geological conditions of Baihetan arch dam foundation are complex, especially the faults and interlaminar and interlaminar staggered zones are developed, with good continuity and poor shape, which are the key objects of dam foundation seepage control treatment. Item gb/t 3923.1 ⑵ 01 and beyond the cost 3. Tensile properties of textile fabrics Part 1: Determination of breaking strength and elongation at break. The purpose is to understand the engineering topographic and geological conditions in detail before construction, pay attention to the inspection of pilot holes and water pressure inspection, and timely analyze Verify the hole depth, formulate a targeted grouting construction scheme, regard "concealed works" as "sunshine operation" construction, become a "reassuring project", and build a solid "underground Great Wall" for Baihetan Hydropower Station
the anti-seepage curtain in the hub area of Baihetan Hydropower Station is composed of three parts: the anti-seepage curtain of the dam foundation, the anti-seepage curtain of the underground powerhouse and the anti-seepage curtain of the second dam. The anti-seepage curtain of the large abandoned dam foundation is connected with the anti-seepage curtain of the underground powerhouse on both banks, forming a complete anti-seepage system in the upstream. The anti-seepage curtain of the dam foundation is constructed in the foundation grouting gallery of the dam body and the curtain grouting adits of the dam foundation on the left and right banks respectively, in which the curtain grouting adits of the dam foundation on the left and right banks are divided into six layers of adits for a long time, and the adit height difference is about 30-60m