Tunnel karst fracture zone slip collapse half-section curtain advancing type grouting reinforcement treatment method

Abstract

The invention discloses a tunnel karst fracture zone slip collapse half-section curtain advancing type grouting reinforcement treatment method. Comprising the following steps that back pressure backfill plugging emergency treatment is conducted on a tunnel face, and slip collapse bodies are reinforced through grouting; arranging a concrete grout stopping wall with the thickness of 2-5m on the tunnel face; a loose body and surrounding rock within the range of 3-4.5 m outside a contour line are excavated in a hole forming section 3 m at the rear end of the grouting reinforcement grouting stopping wall, and an annular grouting stopping curtain layer is formed; grouting reinforcement is conducted on the horizontal section, 3 m away from the top of the tunnel, of the slip collapse body in a segmented advancing type grouting mode, and a horizontal grout stop curtain layer is formed; for a geological weak section, advanced segmented advancing type grouting reinforcement construction is carried out; and after grouting is finished, three advanced horizontal manholes are evenly drilled within the range of 1 m near the arch contour line, and the grouting effect is analyzed and judged. The grouting reinforcement effect can be better guaranteed, the success rate of successful tunneling through the karst fracture zone is increased, safety is high, the construction treatment progress of the unfavorable geological section can be accelerated, and the construction period and cost are saved.

Description

technical field [0001] The invention relates to a method for strengthening and treating slumped bodies in a tunnel karst fracture zone, belonging to the technical field of tunnel construction. Background technique [0002] With the rapid development of railway construction, railways are gradually developing in remote areas, tunnels are getting longer and longer, and the geology they pass through is more complicated. Usually, bad geology includes landslides, mud inrush, water gushing, karst, gas, faults, structural fracture zones, and large deformations. , rockburst, etc., when encountering adverse geology, if the improper treatment method is selected, it will cause large economic losses or safety accidents. [0003] At present, domestic tunnels are still in the exploratory stage in the selection of construction treatment schemes for dealing with unfavorable geological sections such as karst fractured zones, and there is a lack of relatively mature construction case guidance....

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of railway construction, railways are gradually developing in remote areas, tunnels are getting longer and longer, and the geology they pass through is more complicated. Usually, bad geology includes landslides, mud inrush, water gushing, karst, gas, faults, structural fracture zones, and large deformations. , rockburst, etc., when encountering bad geology, if the improper treatment method is selected, it will cause large economic losses or safety accidents.

[0003] At present, domestic tunnels are still in the exploratory stage in the selection of construction solutions for dealing with unfavorable geological sections such as karst fractured zones, and there is a lack of relatively mature construction case guidance.

If the construction is directly carried out according to the traditional curtain grouting scheme, the investment cost will be high and the treatment cycle will be long, which is not suitable from the perspective of economy and construction period guarantee; The curtain support construction method and the CD method construction method have a low success rate and low safety in successfully tunneling through the karst fracture zone, which may lead to unnecessary waste of materials, delay in construction period and compensation for delayed workers

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