A change in the stress-strain state of soil mass due to compensation grouting near an excavation

Introduction. Construction of transportation lines and auxiliary structures of an underground railway is often cumbersome due to the requirement not to exceed maximum values of subsidence and tilt of buildings and structures in areas affected by new construction projects. Compensation grouting is the action that decelerates soil deformations and prevents the subsidence and tilt of buildings and structures from exceeding the limit values. The study focuses on the formulation of and the analytical solution to the problem of the stress-strain state of the soil mass that has weight and that is located beyond the excavation shoring, if depth equals h, distributed strip load q is constant, width b equals 2a, depth equals d, and the distance from the edge of the pit retaining wall equals c.

Materials and methods. A solution to the E. Melan problem was applied to obtain normal and tangential stresses to solve the problem of the stress-strain state of the soil mass that has weight and that is located beyond the excavation shoring, if excavation depth equals h, distributed strip load q is constant, width b equals 2a at depth d, and the distance from the edge of the excavation shoring equals c. Hooke’s law was applied to find the soil mass deformation.

Results. An analytical method was developed to make a quantitative assessment of the stress-strain state of soil under the action of compensation grouting. Isofields of stresses and deformations were obtained to find values of soil uplift and to evaluate the compensation grouting effectiveness.

Conclusions. An analytical solution to the E. Melan problem was applied to solve the problem of injection pressure, acting upward and downward near the excavation shoring, and to derive formulas needed to find components of normal and tangential stresses. The solution analysis shows that the injection pressure, acting upward and downward near the excavation shoring, greatly affects the stress-strain state of the entire soil mass, while large horizontal stresses may occur in the excavation shoring. This issue must be considered in the course of analyzing the strength and stability of excavation shoring.

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