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CN-117051862-B - New and old dam connection method for rubbish dam development

CN117051862BCN 117051862 BCN117051862 BCN 117051862BCN-117051862-B

Abstract

The invention belongs to the field of buildings, and particularly discloses a new and old dam connection method for a garbage dam, which comprises the following steps of (1) constructing a steel pipe-reinforced geotechnical cloth system, (2) constructing a pile anchor system, and then constructing an heightening part above the reinforced part and the old dam to form the new dam. The new and old dam connection method for the rubbish dam topology can not only improve the anti-slip force of the potential slip surface of the old dam body, but also enhance the connection between the new dam body and the old dam body and improve the joint working performance and the coordinated deformation capacity of the new dam body and the old dam body, thereby achieving the purpose of in-situ expansion.

Inventors

  • FENG DELUAN
  • CHEN ZIKANG
  • LIANG SHIHUA

Assignees

  • 广东工业大学

Dates

Publication Date
20260508
Application Date
20230705

Claims (6)

  1. 1. A new and old dam connection method for rubbish dam development is characterized by comprising the following steps: s1, reinforcing an old dam body to form a reinforcing part, wherein the reinforcing part comprises a plurality of reinforced layers which are arranged in a stacked mode along the height direction of the old dam body, each reinforced layer is provided with a steel flower pipe-steel pipe-reinforced geotechnical cloth system, and the reinforcing part comprises the following steps: S11, constructing a steel floral tube-steel tube-reinforced geotextile system, wherein the construction steps of the steel floral tube-steel tube-reinforced geotextile system are as follows: s111, drilling holes on the slope surface of the old dam body, which is contacted with the new dam body, for positioning, and alternately installing the steel flowtube and the anchor cable into the mounting holes after drilling the mounting holes; S112, welding a steel pipe at the end part of the steel flowtube extending out of the old dam body for pulling the reinforced geotechnical cloth, wherein grouting holes are formed in the pipe wall of the steel flowtube, when the steel flowtube is anchored into the old dam body, cement mortar is injected into the steel flowtube, and after the cement mortar is coagulated, the steel flowtube is anchored on the old dam body; S113, paving reinforced geotextile, covering the bottom surface of the filling layer by using the reinforced geotextile, and covering the top surface of the filling layer by using the reinforced geotextile again after filling and tamping of the filling layer are completed, wherein the reinforced geotextile surrounds the filling layer in the vertical direction and is pressed by bagged broken stones; s114, filling the upper and lower reinforced geotextiles through a soil-stone mixture to form the reinforced layer; S12, constructing a pile anchor system, wherein the construction steps of the pile anchor system are as follows: S121, positioning dam foot drilling holes of the old dam body, drilling pile injection holes by using a drill bit of a rotary drilling rig, and cleaning the pile injection holes; s122, erecting a template on the ground of the pile injection hole, wherein the template is flush with the dam crest of the old dam body; s123, hoisting the manufactured reinforcement cage to the position right above the template and aligning the pile hole, and then placing the reinforcement cage into the pile hole; S124, pouring concrete into the template to form a pouring pile until the pouring pile is flush with the dam top of the old dam body; s125, installing a concrete cover plate between the dam top of the old dam body and the post top of the filling pile, wherein the concrete cover plate is constructed on the dam top of the old dam body, extends from the dam top of the old dam body to the filling pile until the bottom surface of the concrete cover plate is flush with the post top of the filling pile, and then is connected with the post top of the filling pile; S126, arranging a concrete waist beam on a pile section of the cast-in-place pile, which is positioned at the same horizontal plane with the anchor rope, for tensioning the anchor rope, wherein a PVC pipe is sleeved on a free section of the anchor rope, then the PVC pipe is arranged in a mounting hole, cement mortar is injected into a gap between the PVC pipe and the wall of the mounting hole, so that the cement mortar in the anchor section reaching the anchor rope can fix the anchor section of the anchor rope and enable the anchor section of the anchor rope and soil around the mounting hole to be connected into a whole, grouting of the anchor section of the anchor rope is continued after grouting is completed so as to fill a space between the PVC pipe and the wall of the mounting hole, and tensioning the anchor rope on the waist beam after the cement mortar is condensed and the strength is qualified; s2, constructing an heightening part above the reinforcing part and the old dam body to form a new dam body.
  2. 2. The method for connecting old and new dams constructed by using the garbage dam according to claim 1, wherein in step S112, before cement mortar is injected into the steel pipe, MICP cementing liquid and bacterial liquid are mixed and then injected into the old dam through the grouting holes of the steel pipe, the injected MICP cementing liquid and bacterial liquid permeate into the pores and cracks in the old dam, and then calcium carbonate deposition is induced by using MICP technology to fill the pores and repair the cracks.
  3. 3. The method for connecting old and new dams with the construction of the waste dams according to claim 1, wherein in step S113, the upper and lower reinforced geotextiles of the filling layer are fixed on the ground or the filling layer of the upper and lower layers by using nails.
  4. 4. The method for connecting old and new dams with garbage dam construction according to claim 1, wherein in step S113, the filling layer is required to be provided with an embedded structure at the lower reinforced geotechnical cloth, the embedded structure is a gully provided at the bottom surface of the filling layer, and then the lower reinforced geotechnical cloth is arranged in the gully and filled with the soil-stone mixture.
  5. 5. The method for connecting old and new dams with garbage dams according to claim 1, wherein in step S126, said PVC pipes are coated with a corrosion-resistant lubricant.
  6. 6. The method for connecting old and new dams for constructing a waste dam according to claim 1, wherein in step S2, the heightening portion is not in direct contact with the old dam body, and is tamped into the dam after being filled with the mixture of the backfill stone by layering.

Description

New and old dam connection method for rubbish dam development Technical Field The invention relates to the field of buildings, in particular to a new and old dam connection method for a garbage dam topology. Background With the rapid increase of the amount of domestic waste, the existing landfill is difficult to continue to fill the increasing amount of waste, and in view of the limited land used for the landfill and the limited storage capacity of the existing landfill, the extension treatment of the existing landfill is required to improve the storage capacity of the existing landfill. In the process of heightening, reinforcing and capacity expanding a garbage field, a higher garbage dam needs to be newly built along the existing old garbage dam, the garbage dam is generally a homogeneous earth dam, the dam body can be regarded as a homogeneous slope, the connecting part of the new and old dam body is the weakest part of the slope according to computational analysis and engineering experience, and the weakest sliding surface of the slope is located at the weakest part. However, if the prior art is used as an earth dam body, and the old dam body is piled up to form an anti-slip ladder and then is piled up and reinforced, the dam body cannot maintain the coordinated deformation of the new dam body and the old dam body, so that cracks are easily generated between the new dam body and the old dam body, the stability of the whole dam body is further affected, and the phenomenon of landslide can easily occur in the future. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a new and old dam connection method for the rubbish dam extension, which can reduce the generation of cracks between a new dam body and an old dam body when reinforcing and extending the old dam body, strengthen the connection effect between the new and old dam bodies and strengthen the integrity of the new and old dam bodies, so that the new and old dam bodies can coordinate deformation and work together, and further improve the stability of the rubbish dam. The technical scheme for solving the technical problems is as follows: A new and old dam connection method for rubbish dam construction comprises the following steps: s1, reinforcing an old dam body to form a reinforcing part, wherein the method comprises the following steps of: S11, constructing a steel flower pipe-steel pipe-reinforced geotextile system; s12, constructing a pile anchor system; s2, constructing an heightening part above the reinforcing part and the old dam body to form a new dam body. Preferably, in step S1, the reinforcement portion includes a plurality of reinforcement layers stacked along a height direction of the old dam body, each reinforcement layer is provided with a steel pipe-reinforcement geotextile system, and the construction steps of the steel pipe-reinforcement geotextile system are as follows: s111, drilling holes on the slope surface of the old dam body, which is contacted with the new dam body, for positioning, and alternately installing the steel flowtube and the anchor cable into the mounting holes after drilling the mounting holes; S112, welding a steel pipe at the end part of the steel flowtube extending out of the old dam body for pulling the reinforced geotechnical cloth, wherein grouting holes are formed in the pipe wall of the steel flowtube, when the steel flowtube is anchored into the old dam body, cement mortar is injected into the steel flowtube, and after the cement mortar is coagulated, the steel flowtube is anchored on the old dam body; S113, paving reinforced geotextile, covering the bottom surface of the filling layer by using the reinforced geotextile, and covering the top surface of the filling layer by using the reinforced geotextile again after filling and tamping of the filling layer are completed, wherein the reinforced geotextile surrounds the filling layer in the vertical direction and is pressed by bagged broken stones; s114, filling the upper and lower layers of reinforced geotextile through the soil-stone mixture to form the reinforced layer. Preferably, in step S112, before cement mortar is injected into the steel flowtube, MICP cementing liquid and bacterial liquid are mixed and then injected into the old dam through the grouting holes of the steel flowtube, the injected MICP cementing liquid and bacterial liquid penetrate into the pores and cracks in the old dam, and then calcium carbonate deposition is induced by utilizing the MICP technology to fill the pores and repair the cracks. Preferably, in step S113, the upper and lower reinforced geotextiles of the filler layer need to be fixed to the ground or the upper and lower filler layers by using nails. Preferably, in step S113, the filling layer is required to have an embedded structure at the lower reinforced geotextile, the embedded structure is a gully provided at the bottom surface of the filling layer, and then the lower