Circulating pressure-maintaining multi-turn grouting method for dam seepage-proofing reinforcement

An environmental protection and dam technology, applied in drinking water installations, water supply installations, buildings, etc., can solve problems such as poor anti-seepage reinforcement effect, difficulty in determining the completion of grouting, and insufficient slurry diffusion distance, so as to reduce subjectivity and experience. , Shorten the construction period, good consolidation effect

Pending Publication Date: 2020-10-30
SUN YAT SEN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the shortcomings of the existing dam anti-seepage reinforcement technology that not only has a long construction period, huge equipment and inconvenient construction, but also is difficult to determine the completion of grouting, the grout diffusion distance is insufficient, and the anti-seepage reinforcement effect is not good. Cyclic holding pressure multi-round grouting method

Method used

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  • Circulating pressure-maintaining multi-turn grouting method for dam seepage-proofing reinforcement
  • Circulating pressure-maintaining multi-turn grouting method for dam seepage-proofing reinforcement
  • Circulating pressure-maintaining multi-turn grouting method for dam seepage-proofing reinforcement

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Experimental program
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Effect test

Embodiment 1

[0039] A cyclic pressure-holding multi-round grouting method for anti-seepage reinforcement of embankments, comprising the following steps:

[0040] A. Determine the location of the permeable layer that needs to be disposed of. The detection methods include dipole dipole detection of high-density electrical method, Wenner type of high-density electrical method, Shi Lun Bell type, transient electromagnetic method, ground penetrating radar, geological drilling Hole and pressure water tests;

[0041] B. In the form of curtain grouting, holes are arranged on the top of the dam close to the water surface, and the schematic diagram of the horizontal holes is shown in figure 1 As shown, then drill the grouting hole with a drilling rig, and the side view of the drilling hole is shown in figure 2 as shown, Figure 1~2Mark 1 is the water-facing surface, 2 is the grouting hole, and 3 is the back-water surface; the curtain grouting is carried out by arranging one or two rows of plum-bl...

Embodiment 2

[0047] This embodiment is a model test:

[0048] Excavate a cuboid model tank with a length of 4m, a width of 2m and a depth of 2m at a construction site, and then backfill the model tank with silt layer by layer. fill up. Then drill the grouting hole at the top layer, lower the grouting pipe, and finally carry out the grouting. The grouting method and the grouting material are the same as in Example 1. Soil density setting 1.5g / cm 3 , the porosity is 49%, the grouting pressure is 0.5MPa, and the grouting amount of the permeable material is 200Kg. In this example, the DCP penetration test is used to test the bearing capacity of the consolidated body after the grouting before and after the grouting. The DCP test points and the model test plan are shown in Figure 6 As shown, the test results are as follows Figure 7 As shown in , the consolidated body is excavated after grouting, and samples are taken to test the compressive strength and impermeability of the consolidated b...

Embodiment 3

[0057] An embankment project is located on the north bank of the earth pond in the southeast of a certain county in Jiangxi Province. There are problems: the filling is not compact, the construction quality is poor, and the dam foundation and abutment are not completely drained, which leads to serious leakage of some embankment foundations, bubble springs, piping There are many; there is no hard slope protection on the facing surface of the embankment or the slope protection is seriously damaged, the anti-scourability is poor, and it is severely scoured by wind waves and currents; some dike sections have steep banks facing the current, and there are no bank fixing measures or the bank fixing measures cannot meet the requirements; Some buildings have been in operation for many years, and the equipment is seriously damaged due to aging and cannot operate normally.

[0058] Before the grouting reinforcement, the high-density electrical detection of the hidden dangers of the embank...

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Abstract

The invention belongs to the technical field of seepage-proofing reinforcement of water conservancy foundations, and particularly relates to a circulating pressure-maintaining multi-turn grouting method for dam seepage-proofing reinforcement. The method comprises the following steps that the position of a permeable layer needing to be disposed is determined; holes are distributed in the position,close to the upstream face, of the top of a dam, and then a grouting hole is drilled through a drilling machine; a grouting pipe is arranged in the grouting hole, a hole sealing pipe is shorter than the grouting pipe, and an isolation block is arranged below the hole sealing pipe; an expansion material is injected into the hole sealing grouting pipe for hole sealing and pressure maintaining; and acirculating pressure-maintaining multi-turn grouting method is used for grouting of permeable high polymers, and the grouting pressure is 0.5-2Mpa. According to the method, construction is convenientand fast, the construction period is short, disturbance to the dam is small, the seepage-proofing effect is good, durability is high, full permeation and diffusion of grout are facilitated, subjectivity and experience of the grouting process can be effectively reduced, and grouting construction can be guided.

Description

technical field [0001] The invention belongs to the technical field of anti-seepage and reinforcement of water conservancy infrastructure, and in particular relates to a circular pressure-maintaining multi-round grouting method for anti-seepage and reinforcement of embankments. Background technique [0002] In recent years, my country's water conservancy infrastructure construction has made remarkable achievements. At present, the total length of embankments has been 410,000 kilometers, and there are more than 98,000 reservoirs of various types. They are an important part of my country's flood control and disaster reduction field. , The geological conditions are complex, and dangers occur frequently during the flood season. Similarly, among the built reservoirs, the risk rate reaches 57.1%, and most of the small and medium-sized dangerous reservoirs need anti-seepage reinforcement. Once these water conservancy facilities fail, it will have a major impact and seriously threa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D15/02E03B3/16
CPCE02D15/02E03B3/16
Inventor 郭成超王超杰石明生赵鹏赵线峰薛冰寒王颖丽夏洋洋刘琪黄光营
Owner SUN YAT SEN UNIV
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