The essence of grouting and strengthening rock stratum is to use cement slurry, chemical pulp and other grouts to pass through the boreholes of Beijing to pass through the boreholes. After it solidifies, it will fill the cracks of the rock layers and cement the rock layers into a whole to improve its stability and strength. The purpose of reinforcement.
Grouting reinforcement is divided into two types: pre-advanced (advanced) reinforcement and post-mortem (post-wall) reinforcement. Pre-reinforcement is grouting reinforcement before the construction passes through a soft or fractured rock formation. For example, shafts, roadways, and mining roofs are grouted and reinforced before construction and mining. After the event (behind the wall) Grouting reinforcement is the grouting reinforcement adopted after the construction process or after the construction, after the project is found to be unstable, deformed or roofing, such as the roadway bracket is damaged due to the ground pressure The wall is filled and reinforced with grout. In addition to cement, there are a wide variety of chemical materials and clays . Most of the grouting materials can simultaneously achieve rock reinforcement and grouting. A large number of geotechnical practices have proved that the physical and mechanical properties of the rock layer after grouting have been improved in many aspects. The reason is that the cement particles will adhere to the crack wall after grouting (filling grouting), or mixed with geotechnical particles. The stone body (during jet grouting) acts as a filling and cementing layer to improve the cohesion and internal friction angle of the rock layer, increase the compactness and uniformity, reduce the anisotropy, and increase the elastic modulus. According to the Soviet experimental data, the deformation modulus of the rock layer after grouting is increased by 2.8 times in limestone and 2.7 times in asphaltene limestone , in gneiss , compared with the unmoulded natural modulus . Increased to 2.9 times. According to the data of France, Spain, Italy and the Soviet Union , the dynamic elastic modulus E0 of the rock layer after grouting is 1.5~175% higher than that before grouting, and the static elastic modulus is increased by 15~375% . Sound waves and seismic waves travel the least in the air, spreading faster in hard rock formations, but spreading faster in hard, dense, and void-free rock formations.
After the grouting, the elastic wave velocity is also increased by 15~50% due to the increase of the density of the rock formation . May be illustrated by the above, grouting engineering helps to improve the physical properties of the rock, grouting technique thus been increasingly widely used in mining, civil engineering, hydraulic, and other geotechnical channel iron reinforcement project.
Grouting reinforcement is divided into two types: pre-advanced (advanced) reinforcement and post-mortem (post-wall) reinforcement. Pre-reinforcement is grouting reinforcement before the construction passes through a soft or fractured rock formation. For example, shafts, roadways, and mining roofs are grouted and reinforced before construction and mining. After the event (behind the wall) Grouting reinforcement is the grouting reinforcement adopted after the construction process or after the construction, after the project is found to be unstable, deformed or roofing, such as the roadway bracket is damaged due to the ground pressure The wall is filled and reinforced with grout. In addition to cement, there are a wide variety of chemical materials and clays . Most of the grouting materials can simultaneously achieve rock reinforcement and grouting. A large number of geotechnical practices have proved that the physical and mechanical properties of the rock layer after grouting have been improved in many aspects. The reason is that the cement particles will adhere to the crack wall after grouting (filling grouting), or mixed with geotechnical particles. The stone body (during jet grouting) acts as a filling and cementing layer to improve the cohesion and internal friction angle of the rock layer, increase the compactness and uniformity, reduce the anisotropy, and increase the elastic modulus. According to the Soviet experimental data, the deformation modulus of the rock layer after grouting is increased by 2.8 times in limestone and 2.7 times in asphaltene limestone , in gneiss , compared with the unmoulded natural modulus . Increased to 2.9 times. According to the data of France, Spain, Italy and the Soviet Union , the dynamic elastic modulus E0 of the rock layer after grouting is 1.5~175% higher than that before grouting, and the static elastic modulus is increased by 15~375% . Sound waves and seismic waves travel the least in the air, spreading faster in hard rock formations, but spreading faster in hard, dense, and void-free rock formations.
After the grouting, the elastic wave velocity is also increased by 15~50% due to the increase of the density of the rock formation . May be illustrated by the above, grouting engineering helps to improve the physical properties of the rock, grouting technique thus been increasingly widely used in mining, civil engineering, hydraulic, and other geotechnical channel iron reinforcement project.
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