Continuous beam pipeline force rib friction loss testing method based on karst cave underground river environment

Abstract

The invention discloses a continuous beam pipeline force rib friction loss testing method based on a karst cave and underground river environment. The method comprises the following steps that S1, a tunnel section A is excavated to penetrate through a karst cave; S2, an underground river is redirected; S3, the karst cave is backfilled to the tunnel foundation surface; S4, a cave wall is protected,and a plurality of anchor cables are constructed; S5, the karst cave is fully filled, and an anchor cable is connected with a backfill body; S6, the backfill body is excavated to form a tunnel section B; S7, piers and abutments are constructed on the tunnel section A; S8, a first section, a second section, a second section, a third section and a closure section are divided; S9, a supporting foundation of the tunnel section A is constructed; and S10, from the first section to the closure section, continuous beam construction is conducted according to the section sequence. The method has the advantages of being stable, reliable, high in safety and capable of preventing sedimentation.

Description

technical field [0001] The invention mainly relates to the tunnel construction technology in the karst cave underground river environment, in particular to a method for testing the friction loss of continuous beam pipeline force tendons based on the karst cave underground river environment. Background technique [0002] Yujingshan Tunnel is located in Weixin County, Yunnan Province, with a total length of 6306m and a double-track tunnel. On July 23, 2016, the karst cave was detected by advanced drilling at the face of the small mileage end of the Hengdong work area, and a giant karst cave hall and underground river were discovered after the reveal. The karst cave is about 230m long and 93m wide in a roughly rectangular shape. The top of the karst cave is in the shape of a dome. Underground river, the width of the river is 5-15m. The tunnel passes through the giant karst cave hall, the two sides of the giant karst cave hall are the tunnel A section, and the tunnel passing t...

AI Technical Summary

Problems solved by technology

[0003] Since the tunnel has to pass through the huge karst cave hall, and there is an underground river at the bottom, both the early construction and later operation bring high risks, such as the top of the karst cave falling off, and the bottom due to subsidence due to the underground river, etc.

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