Continuous beam first section construction method based on karst cave underground river environment tunnel construction
A technology for tunnel construction and construction methods, applied in tunnels, tunnel linings, bridges, etc., can solve problems such as settlement, falling blocks at the top of karst caves, etc., to prevent settlement, improve stability and reliability, and improve backfill and stability. The effect of reliability
Inactive Publication Date: 2020-12-08
成贵铁路有限责任公司 +2
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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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[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0032] Such as Figure 1 to Figure 3 As shown, the present invention is based on a kind of embodiment of the continuous beam construction method of the first segment of the tunnel construction in the environment of the karst cave underground river. The environment includes a karst cave 1 and an underground river 2 at the bottom of the karst cave 1. The tunnel is section A of the tunnel, and the tunnel passing through the karst cave 1 is section B of the tunnel; the construction method includes the following steps:
[0033] S1: Excavate section A of the tunnel to penetrate the karst cave 1;
[0034] S2: Divert the underground river 2 so that the underground river 2 does not flow through the cave 1;
[0035] S3: backfill the karst cave 1 until it is backfilled to the foundation surface of the tunnel;
[0036] S4: Carry out protective...
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The invention discloses a continuous beam first section construction method based on karst cave underground river environment tunnel construction. The continuous beam first section construction methodcomprises the following steps that S1, a tunnel section A is excavated to penetrate through a karst cave; S2, the underground river is rechanneled; S3, the karst cave is backfilled to the tunnel foundation surface; S4, the hole wall is protected, and a plurality of anchor cables are constructed; S5, the karst cave is fully filled, and the anchor cables are connected with a backfill body; S6, thebackfill body is excavated to form a tunnel section B; S7, piers are constructed on the tunnel section A; S8, dividing a first section, a second section, a third section and a closure section; 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 continuous beam first section construction 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 of the karst cave underground river environment, in particular to a construction method of the first section of the continuous beam based on the tunnel construction of 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 tunn...
Claims
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Login to View More IPC IPC(8): E21D9/00E21D20/00E21D11/14E21D11/10E01D21/00
CPCE01D21/00E21D9/00E21D9/001E21D11/10E21D11/14E21D20/00
Inventor 李小兵黄泽周浩黄光颜桢炜
Owner 成贵铁路有限责任公司