A flexible comprehensive support structure for red bed rock slope and its construction method

Abstract

The invention discloses a red-bed rock slope flexible comprehensive support structure and a construction method thereof. The flexible comprehensive support structure comprises a pre-grouting reinforcement structure before excavation, an anchoring grouting reinforcement structure after excavation, a slope surface normal prestressing reinforcement structure and micro anti-slide piles. In the construction method, before graded excavation of the slope, after reinforcement grouting is carried out on the slope in the grade, secondary slope excavation construction is then carried out; anchor rods oranchor cables are adopted to carry out grouting anchoring on a drilled hole in adjacent interlayered rock strata, prestressing ropes are arranged between the end parts of the anchor rods or the anchorcables, a rope net forming prestressing pressure on the slope surface is additionally suspended between the ropes, an ecological protective layer is formed through spraying borrowed soil on the slopesurface; and the micro anti-slide piles are arranged at the foot of the slope, and filter capillary drainage pipes are arranged in the slope body. The structure and the method disclosed in the invention are suitable for reinforcement for the red-bed rock slope and other rock slopes with similar geological characteristics, solve the technical problem that the red-bed slope is hard to effectively reinforce, and have the advantages of low cost, fast construction speed, small construction disturbance, good construction safety and good environmental protection.

Description

technical field [0001] The invention discloses a flexible comprehensive support structure for a red bed rock slope and a construction method thereof, belonging to the field of geotechnical engineering. Background technique [0002] Red beds are widely distributed in my country, and are widely distributed in Sichuan Basin, Xichang-Central Yunnan, Western Yunnan, Shaanxi-Gansu-Ningxia Basins in Northwest China, Central China and South my country in Southwest China. Red beds have different properties from other strata, which are mainly reflected in the following aspects: ① Red beds are mostly composed of argillaceous rock (soft rock) and sandstone (hard rock) interbedded, and there are large differences in the properties of soft and hard beds. ② The argillaceous rock is low in strength, easy to soften when exposed to water, and easy to disintegrate when dehydrated. The weathering of red bed slopes is strong, especially for slopes dominated by argillaceous rocks. Excavation sl...

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Problems solved by technology

However, they also have large disturbances to the rock and soil during construction; the support is often not timely, and it is difficult to give full play to the self-sustaining ability of the rock and soil; the ductility and dynamic performance are poor, and there is no obvious sign before the structure becomes unstable; Disadvantages such as poor repairability and high construction risk

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