Red-bed rock slope flexible comprehensive support structure and construction method thereof

A support structure and rock slope technology, applied in the field of geotechnical engineering, can solve the problems of untimely support, poor ductility and dynamic performance, high cost, etc., and achieve the effect of improving self-sustaining ability, reducing disturbance and convenient construction

Active Publication Date: 2019-01-15
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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...

Method used

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  • Red-bed rock slope flexible comprehensive support structure and construction method thereof
  • Red-bed rock slope flexible comprehensive support structure and construction method thereof
  • Red-bed rock slope flexible comprehensive support structure and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] See attached figure 1 , 2 , 3, 4, 5, 6, 7, a flexible comprehensive support structure for a red bed rock slope, the flexible comprehensive support structure includes: an advance grouting reinforcement structure before excavation, and an anchor grouting reinforcement structure after excavation structure, slope normal prestressed reinforcement structure, miniature anti-slide piles; the advanced grouting reinforcement structure before excavation is to drill the first grouting hole 1 on the rock and soil of the first level slope before excavation, and the first The grouting hole 1 is drilled in the vertical direction, the depth reaches 1-2m below the horizontal position of the slope top of the second grade, and the first grouting hole 1 is injected with high pressure to the designed contour line of the first grade slope 2, in order to form a root network slurry vein complex with strong shear resistance in the non-excavated rock and soil below the Lunguo line 2 of the first...

Embodiment 2

[0079] The difference between this embodiment and Embodiment 1 is that one end of the three anti-skid rods 801 in the miniature anti-skid pile 8 is fixedly connected, and the other ends are at a certain angle in different planes; and among the three anti-skid rods 801, the one closest to the roadbed One rod is substantially perpendicular to the subgrade plane 14, and the other two are approximately perpendicular to the potential sliding surface 15 at the slope corner.

Embodiment 3

[0081] A construction method for a flexible comprehensive support structure of a red bed rock slope, comprising the following steps:

[0082] The first step: advanced grouting reinforcement before excavation

[0083] According to the field geological investigation results of the red layer slope, before the excavation of the slope, the first grouting hole 1 is drilled in the rock and soil of the first level slope, and the first grouting hole 1 is drilled along the vertical direction, and the depth reaches the second level. 1-2m below the horizontal position of the top of the first-grade slope, the first grouting hole 1 is provided with a grouting steel flower tube, and the first grouting hole is injected with high pressure to the position below the designed slope contour line 2, so that In the non-excavation rock and soil below the surface contour line 2, a root network slurry vein complex with strong shear resistance is formed to strengthen the non-excavation rock and soil; re...

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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...

Claims

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Application Information

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IPC IPC(8): E02D17/20E02D5/76E02D3/12
CPCE02D3/12E02D5/76E02D17/20E02D17/202E02D2250/003
Inventor 张锐兰天郑健龙陈昌富曾铃付宏渊刘晓明张军辉
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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