Seasonal permafrost region self-thermoregulation returning energy-consuming slope supporting structure and construction method

Abstract

The invention discloses a seasonal permafrost region self-thermoregulation returning energy-consuming slope supporting structure and a construction method and belongs to the technical field of seasonal permafrost anchor-plate retaining. The seasonal permafrost region self-thermoregulation returning energy-consuming slope supporting structure comprises a lattice beam, an anchor rod, a spring and a thermal insulation structure and is characterized in that the anchor rod is punched into a slope, anchoring slurry is injected with pressure, the anchor rod is anchored in a stable soil layer, a thermal insulation structure and a geogrid are sequentially paved from the slope surface to the exterior, a mortar surface layer is sprayed, a gird beam is constructed on the slope surface, the anchor rod penetrates a cross position of the gird beam, a base plate and a spring sequentially sleeve the anchor rod, the anchor rod is anchored on gird beam through an anchorage device, vertical water discharging channels are horizontally arranged with the interval of certain distance along the slope surface, a intercepting ditch is arranged at the slope top, and a drainage channel is constructed at a slope toe. The seasonal permafrost region self-thermoregulation returning energy-consuming slope supporting structure has self-thermoregulation thermal protection and heat insulation, expansion and shock reduction and self-returning supporting performances, timely discharges moisture, effectively solves slope instability caused by frost heaving thaw collapse disasters. The construction method is simple, strong in feasibility, quick in construction and low in cost.

Description

technical field [0001] The invention relates to a self-adjusting and returning energy-consuming slope support structure and construction method in seasonal frozen soil areas, belonging to the field of seasonal frozen soil bolting and spraying support technology, and is especially suitable for slopes and foundations in seasonal frozen soil areas. Pit support works. Background technique [0002] Seasonally frozen soil refers to the layer of soil that freezes in winter and thaws in spring. Seasonally frozen soil accounts for 55% of my country's land area, while mountains account for 67% of the country's land area. Therefore, my country is not only a country with seasonal permafrost but also a country with mountains. This objectively determines the emergence of a large number of seasonal frozen soil slopes in the construction of transportation lines and water conservancy projects in our country. In addition, the current urban construction land is extremely scarce, and many co...

AI Technical Summary

Problems solved by technology

When the temperature rises in spring and the permafrost melts, the water content of the soil increases and the strength decreases, resulting in a decrease in the stability of the slope or even instability.

After seasonal freeze-thaw tests, it is found that the main defects of the existing bolting and spraying support technology in seasonally frozen soil areas are: (1) thermal insulation is basically not considered, even if thermal insulation is considered in some projects, because traditional materials can only be single , low heat capacity, easy to be torn, large heat loss, small sensible heat storage energy, and imperfect thermal insulation construction technology of the support structure, resulting in failure to achieve the purpose of engineering treatment; (2) Frost heaving makes the slope and support structure Partial displacement occurs, and the anchor rod has residual deformation during melting and settlement, which leads to the weakening of the restraint of the support structure on the slope

Due to the defects of the two, the anchor-spray support structure cannot avoid the slope instability caused by freezing and thawing

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