Subgrade structure and construction method for water-stop reinforcement in deep-buried karst areas

Abstract

The invention discloses a deep-lying karst region water seal reinforced roadbed structure. The structure mainly comprises a roadbed (1), a cast-in-situ concrete slab (2), a bore hole (3), a slurry radiation area (4), a water flow (5), a pre-stress longitudinal beam (6), a cave (7), an independent base (8), a pre-stress crossbeam (9), a grouting pipe (12) and a slurry radiation hole (13). The water flow (5) and the cave (7) are isolated by the slurry radiation area (4) through a curtain grouting technology to prevent the growth of the cave; and the pre-stress longitudinal beam (6) and the pre-stress crossbeam (9) are used in the roadbed area above the cave (7) to support the pressure applied to the cast-in-situ concrete slab (2) by the roadbed (2), and the independent base (8) provides supporting force for the pre-stress beams. The structure can effectively processes large caves with the depths being greater than 10 m, effectively isolates the water flow, prevents the growth of the cave, has guaranteed stability, is simple to construct, is economic and reliable, and has wide application prospect.

Description

technical field [0001] The invention relates to the technical field of road engineering in civil engineering, in particular to a subgrade structure and a construction method for water-stop reinforcement in deep-buried karst areas. Background technique [0002] In the construction of road engineering, it is inevitable to pass through some karst areas. Karst caves are one of the most typical hazards in karst areas, which pose a serious threat to road construction; the collapse of karst caves will cause property losses to projects that have been built or are under construction. , and even endanger personal safety, causing a huge negative impact on society, cave collapse has become one of the main safety hazards in karst areas. The formation of karst caves is the result of long-term water erosion of limestone. Under the action of water and carbon dioxide, limestone forms calcium bicarbonate and dissolves in water, so karst caves are formed and continue to develop and expand. Th...

AI Technical Summary

Problems solved by technology

The traditional karst cave treatment technologies mainly include: grouting, rock filling, pile foundation, etc. The grouting technology is only suitable for small karst caves, and the cost of grouting for large karst caves is expensive, and the technical operation is complicated; the rock filling treatment technology is only suitable for shallow caves. Karst caves, for deep caves, the excavation process is cumbersome, and the workload is huge, and it will cause certain damage to the local ecological environment; as a commonly used technique for treating karst caves, the pile foundation has relatively high technical requirements, and the position of the pile foundation cannot At the same time, with the continuous erosion of the karst cave by the water flow, it will inevitably cause the development and expansion of the karst cave. The original pile foundation cannot effectively maintain the long-term stability of the subgrade structure.

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