Combined repairing method for rock mass multi-scale fractures based on microbial mineralization

Abstract

The invention provides a combined repairing method for rock mass multi-scale fractures based on microbial mineralization. The combined repairing method comprises the following steps that a grouting pipe is placed in a surface main fracture of the millimeter level or the centimeter level or above; a mixed slurry A, a mixed slurry B and microorganism mixed liquid are sequentially injected into the deep fractures by using grouting equipment; the mixed slurry A is obtained by uniformly mixing and stirring in-situ rock sand, magnesite powder, a urea solution and a urease solution in parts by weight; the mixed slurry B is obtained by uniformly mixing and stirring in-situ rock sand, limestone powder, a urea solution and a bacillus pasteurii bacterial solution; and the microorganism mixed liquid is obtained by uniformly mixing and stirring limestone, a urea solution and a bacterial solution. The combined repairing method for the rock mass multi-scale fractures based on the microbial mineralization can repair the multi-scale fractures at high pressure, high efficiency and high repairing rate, and has the advantages that repairing materials are convenient to obtain, and compatibility and weather resistance are good.

Description

technical field [0001] The invention relates to rock mass restoration technology, in particular to a combined restoration method for multi-scale cracks in rock mass based on microbial mineralization. Background technique [0002] Fissures are widely distributed in the rock mass. Although they have different origins, such as weathering, diagenesis, and tectonic action, they have a common feature in form, that is, the diversity of scales, often from the free surface to the interior of the rock mass. Centimeter-millimeter-micron gradient, randomness in distribution, intertwined into a complex network. The repair and reinforcement of multi-scale complex cracks has been a research hotspot in the field of rock mechanics and engineering in recent years, because if they are not repaired, a large number of underground caverns, mines, slopes and other engineering excavation faces will suffer from stress unloading or Gradual instability and damage occur during the weathering process, ...

AI Technical Summary

Problems solved by technology

The above methods have achieved the purpose of rock mass fissure repair, reinforcement and seepage reduction to a certain extent, but these technologies have certain limitations. When the fissures are micron-millimeter-cm multi-scale complex fissures, they can only target a single Large-scale cracks realize effective repair and reinforcement

Due to the large particles and poor permeability of cement slurry, it can only fill and repair large cracks at the centimeter level and above, and it is powerless to micro-cracks at the micron and millimeter level

Although inorganic materials have relatively good permeability and can infiltrate and fill micro-cracks, inorganic materials and rock minerals on both sides of the cracks generally have shortcomings such as cohesion and poor compatibility. The strength is prone to erosion failure, and the strength of the rock mass cannot be improved, and due to the difference in expansion coefficient from the original rock minerals, it is easy to cause secondary damage to the cracks in the process of thermal expansion and contraction

Organic materials are highly viscous, poor in permeability, difficult to penetrate into micro-cracks and have poor material durability, and poor durability of crack repair effect