Method and device for controlling deformation of soil around foundation pit

Abstract

The invention discloses a deformation control method and device for surrounding soil mass of a foundation pit. The deformation control method comprises the following steps that S1, one or more drilledholes are drilled within the set distance range of the foundation pit; S2, grouting pipes are pre-embedded in the drilled holes, grouting holes are formed in the grouting pipes, and the outer sides of the grouting holes are sleeved with bags; S3, the deformation amount of the surrounding soil mass of the foundation pit is detected, whether the deformation amount exceeds a early-warning value or not is judged, and if yes, the step S4 is executed; and S4, grouting is conducted through the grouting pipes, and the deformation amount is controlled. According to the deformation control method and device for the surrounding soil mass of the foundation pit, surrounding soil mass deformation caused by excavation of the foundation pit can be effectively restored, the situation that the soil mass isdisturbed by scattering-around of grout is avoided, and waste and environmental pollution caused by scattering-around of the grout are also avoided; after the grout in the bag is solidified, a pile body with stiffness and strength is formed, and thus further development of deformation is effectively controlled; and meanwhile, segmented and multiple-time grouting can be achieved at the same position, control is flexible, and different engineering needs can be met.

Description

technical field [0001] The invention relates to the technical field of soil deformation control, in particular to a deformation control method and device for soil around a foundation pit. Background technique [0002] The excavation of the foundation pit often causes the displacement of the surrounding soil, which has an adverse effect on the surrounding environment (buildings, tunnels). During the project, the deformation of the surrounding environment will be controlled by burying grouting pipes beside the foundation pit and pouring cement slurry. This process usually cannot control the flow direction of cement slurry, which can lead to several problems: [0003] 1. Cement grout only fills the gaps between soil bodies, and cannot effectively compensate for the deformation of surrounding buildings and tunnels caused by excavation of foundation pits. [0004] 2. The dispersion of cement grout will disturb the soil to a certain extent, destroy the soil structure, and may fu...

AI Technical Summary

Problems solved by technology

This process usually cannot control the flow direction of cement slurry, which can lead to several problems:

[0003] 1. Cement grout only fills the gaps between soil bodies, and cannot effectively compensate for the deformation of surrounding buildings and tunnels caused by foundation pit excavation

[0004] 2. The dispersion of cement grout will disturb the soil to a certain extent, destroy the soil structure, and may further increase the deformation of the protected object before the grout solidifies

[0005] 3. The injected cement slurry only strengthens the soil, but does not form an effective and concentrated reinforcement, which cannot effectively control the further development of deformation

[0006] 4. After the grouting pipe is filled with cement slurry, it can only be used once due to the cement solidification and plugging, and cannot be used for secondary or multiple grouting, nor can it be segmented

[0007] 5. Due to the inability to control the flow direction of cement slurry, the amount of cement slurry poured increases, causing waste and polluting the environment

[0008] In addition, general grouting measures do not pay attention to the monitoring data of protected objects, and often grouting based on experience, and do not adjust parameters such as grouting volume, grouting pressure, and grouting speed based on monitoring feedback data

[0009] To sum up, the existing technology cannot effectively restore the environmental deformation around the foundation pit, but will further disturb the soil, increase the deformation, and cannot effectively control the further development of the deformation. At the same time, it cannot solve the problem of multiple grouting and environmental problems. Pollution, grouting parameters based on experience, etc.

Images