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Construction method and structure of water seepage roadbed slope drainage system

A technology of drainage system and construction method, which is applied in the direction of infrastructure engineering, excavation, construction, etc., and can solve problems such as unfavorable stability of slopes and reduction of geological parameters of slopes

Pending Publication Date: 2019-06-25
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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Problems solved by technology

Due to the shallow buried depth of the groundwater level in the seepage road section, the slope has been in a saturated state after excavation, and the slope seepage is serious in rainy seasons, resulting in the comprehensive circulation effects of seepage water pressure pointing to the outside of the slope and the reduction of the slope’s geological parameters. Unfavorable slope stability

Method used

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  • Construction method and structure of water seepage roadbed slope drainage system

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Embodiment

[0020] This example figure 1 As shown, it includes a dewatering well 5, a drainage pipe 7, an intercepting ditch 6, a side ditch 8, and the like. Outside the slope top 2~3 meters position, get the dewatering well 5, the depth of the dewatering well 5 is from the slope top to the bottom height of each level of step plane 4. Fill the water-permeable material 9 in the dewatering well 5, and the water-permeable material 9 is gravel or coarse sand. The groundwater level of the seepage subgrade 1 is lowered through the dewatering well 5, and the top of the dewatering well 5 is sealed with plain concrete or clay 10 at the top of the dewatering well 5. The bottom of each dewatering well 5 is connected with a drainage pipe 7, and the water in the dewatering well 5 is discharged outside the side slope through the intercepting ditch 6 arranged on the step plane 4 or the side ditch 8 on the side of the side slope of the seepage subgrade 1. During slope construction and operation, loweri...

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Abstract

The invention discloses a construction method and structure of a water seepage roadbed slope drainage system. A side slope on one side of a roadbed edge is trimmed into a stepped inclined slope surface; at a precipitation well, the pressure direction of infiltration water and the groundwater level are changed through the precipitation well at the top of the slope; the bottom of the precipitation well is connected with an intercepting ditch of each step plane through a drain pipe, and water in the precipitation well is discharged through the intercepting ditch, thereby increasing the stabilityof the side slope to ensure the construction and driving safety of the water seepage roadbed. The construction method and structure are suitable for an excavated roadbed slope section with severe water seepage or difficulty in drainage of the side slope. The groundwater level in the side slope can be reduced, the water can be collected in the precipitation well to be discharged out of the side slope through the drainage pipe, to improve the geology shear strength of the side slope. Before the side slope is excavated, the precipitation well is dug to reduce the groundwater level, and the excavation conditions are improved to prevent the side slope from collapsing due to water seepage during construction.

Description

technical field [0001] The invention relates to a construction method and structure of a seepage roadbed slope drainage system, and belongs to the technical field of highway roadbed slope drainage. Background technique [0002] The geological conditions in the southwestern mountainous area are complex, the route selection is difficult, and the amount of filling and excavation is relatively large. When encountering the slope section of seepage subgrade, the methods commonly used at present are to slow down the slope, plant grass for protection, anchor frame beams, hang nets and spray grout, and set up slope protection and drainage such as slope top cut-off ditch and platform cut-off ditch . Due to the shallow buried depth of the groundwater level in the seepage road section, the slope has been in a saturated state after excavation, and the slope seepage is serious in rainy seasons, resulting in the comprehensive circulation effects of seepage water pressure pointing to the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20E02D19/10
Inventor 胡兵华边洪坡王传波李元明蔡华卿
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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