Detection and evaluation method of grouting reinforcement effect of soft surrounding rock in underground engineering

Abstract

The invention discloses a method for detecting and evaluating the reinforcing effect on the weak surrounding rock grouting during the underground construction, which mainly comprises the sigma-D curve method, the surrounding rock consolidation mean standard-reaching value calculation method, the grouting reinforcement effect standard-reaching rate calculation method and the grouting reinforcement effect index coefficient calculation method, accompanied by the borehole television and geological radar combined imaging observation method. The dependant data of the method are comprehensive and reliable. In this way, not only the visual qualitative analysis on the grout diffusion and rock-stratum strengthening condition of weak surrounding rocks can be realized through a borehole television and a geological radar, but also the reinforcing levels of all surrounding rocks of different depths can be quantitatively obtained through the grouting reinforcement effect index coefficient calculation method and the grouting reinforcement effect standard-reaching rate calculation method at the same time. Therefore, the systematicness and the scientificity of evaluation results are improved. The method provides a basis for the evaluation on the grouting effect of the grouting and reinforcing construction on weak surrounding rocks during the underground construction and can guide the evaluation operation on the reinforcing effect of the weak surrounding rock grouting.

Description

technical field [0001] The invention belongs to the technical field of safety in underground engineering, and in particular relates to a method for detecting and evaluating the effect of grouting reinforcement on weak surrounding rocks in underground engineering. Background technique [0002] At present, when unfavorable geological bodies such as weak surrounding rocks are encountered during the excavation of underground caverns, the method of grouting is often used to make the broken loose rocks and the grout cemented to make them a whole, and the surrounding rocks are changed through the bonding effect of the grouting fluid. The loose crushed stone structure achieves the purpose of increasing the strength of the surrounding rock. It has been proved by practice that grouting the weak surrounding rock has a good effect on changing the strength of the surrounding rock, exerting the bearing capacity of the surrounding rock itself, and ensuring the safety of the underground cave...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to the complexity of the geological conditions at the construction site, it is often difficult to obtain accurate results using the transient electromagnetic method and ground radar method

[0004] 2. When there is a large metal structure or a low-resistance layer mineralization zone around, the data measured by the transient electromagnetic method cannot be used

[0005] 3. The transient electromagnetic method and the ground radar method can only conduct qualitative analysis and judgment on the image of the weak surrounding rock after reinforcement, and cannot achieve accurate quantitative analysis of the reinforcement effect

[0006] 4. Using the drilling method takes a long time from on-site coring to getting the test report, which seriously restricts the progress of the construction and increases the cost of the project budget

[0007] 5. It is difficult to guarantee the core recovery rate and integrity when drilling in weak and broken complex formations, so it is impossible to obtain the physical properties and mechanical parameters of the local rock formations

[0008] 6. At the same time, because the cores taken have been separated from the original environmental stress, temperature and other constraints, they cannot well represent the strength of the rock mass itself

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