Construction method for in-situ reinforcing of high-pressure cement-chemical pulp compound grouting
A cement grouting and construction method technology, applied in soil protection, infrastructure engineering, construction and other directions, can solve problems such as difficulty in meeting shear and tensile requirements of dams, damage to surrounding rock mass, and difficulty in construction, etc. Mechanical requirements, saving construction costs, and ensuring the effect of grouting
Active Publication Date: 2015-05-13
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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Problems solved by technology
[0003] At present, engineering measures such as excavation, concrete replacement and prestressed anchoring are generally used to deal with faults, broken zones and weak rock formations at home and abroad. The foundation, when the cavern is excavated, will cause the release of ground stress, causing the surrounding rock mass to be damaged and destroyed to varying degrees. Even if the concrete is backfilled, it is difficult to meet the shear and tensile requirements of the dam. Therefore, it is urgent to use the in-situ Reinforcement technology replaces
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[0054] A construction method for in-situ reinforcement and reinforcement of high-pressure cement-chemical slurry compound grouting for the weak parts of the dam foundation of a certain hydropower station, comprising the following steps:
[0055] (1) cloth hole
[0056] Firstly, three rows of holes are arranged on the weak parts of the dam foundation of the hydropower station to be treated (see figure 1 ), the upper and lower rows are cement grouting holes, and the middle row is high-permeability epoxy chemical grouting holes. The row spacing is 2m, and the holes are staggered in adjacent rows, and the hole spacing is 2m. The hole depth is to cross the fault to be treated and its affected zone in the weak part. The cement grouting holes are alternately provided with high-pressure cement grouting holes and finely ground cement grouting holes, and the high-permeability epoxy chemical grouting holes are alternately provided with chemical grouting I sequence holes and chemical gr...
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Abstract
The invention discloses a construction method for in-situ reinforcing of high-pressure cement-chemical pulp compound grouting, which is characterized by comprising the following steps: performing high-pressure cement grouting on a soft part of a to-be-processed foundation; performing fine cement grouting; and grouting a high-osmosis epoxy chemical pulp after the fine cement grouting is performed and the permeability rate of a pressurized water detecting hole section is less than or equal to 1Lu. According to the construction method provided by the invention, the non-uniformity of an osmotic coefficient of a grouted stratum is improved; the chemical pulp only can permeate into fine cracks or gaps of rock clay particles less than 0.1mm; the purposes of lithologic treatment for soil and modification for soft rock are achieved; according to the construction method provided by the invention, the continuous cement paste can be formed; a 'skeleton' is formed in a soft foundation; the effect of increasing the modulus of deformation of a processed stratum is obvious; the soft and broken foundation which is deeply embedded and low in osmosis property is subjected to in-situ solidification and reinforcement; and the mechanical demand of a large hydropower station dam on the foundation is met.
Description
technical field [0001] The invention belongs to the technical field of weak and broken foundation reinforcement, and in particular relates to a construction method for in-situ reinforcement and reinforcement of high-pressure cement-chemical slurry compound grouting suitable for weak and broken foundations of large-scale hydropower projects. Background technique [0002] In the southwestern region of my country, which is rich in hydraulic resources, many large reservoirs and high dams are under construction or planned to be constructed. The dam foundations generally have faults, broken zones and weak rock formations. These will affect the safety of the dam, so they must be dealt with. [0003] At present, engineering measures such as excavation, concrete replacement and prestressed anchoring are generally used to deal with faults, broken zones and weak rock formations at home and abroad. The foundation, when the cavern is excavated, will cause the release of ground stress, ca...
Claims
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IPC IPC(8): E02D3/12
Inventor 胡美龙梁利岩史珺何泳生
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI