Method and structure for micro-disturbance renovating of existing high speed railway subgrade deformation disease

Abstract

The invention discloses a method for micro-disturbance renovating of an existing high speed railway subgrade deformation disease. The method comprises the following steps: 1) constructing a plurality of miniature piles on side slopes and slope toes; 2) after the miniature piles achieve designed strength, arranging grouting holes between two adjacent miniature piles; 3) processing grouting construction in the grouting holes in a floral tube grouting method, wherein the grouting construction material is the rapid-hardening early-strength material formed by adding accelerating agent into straight cement grout; 4) when grouting pressure reaches to the maximum grouting pressure predetermined by grouting construction, stopping grouting process, or when an observation point on a deformed monitoring road shoulder signs to be upwarpped, stopping the grouting process; when the grouting pressure is less than the predetermined maximum pressure and the grout is leaked, stopping the grouting process; and 5) after the grout in grouted soil mass achieves the designed strength, completing this proposal. According to the invention, high speed railway subgrade deformation disease can be managed effectively; sunk ballastless rail lines can also be upwards lifted controllably; and the smoothness of disease lines is improved.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method and structure for treating the deformation and disease of subgrades of micro-disturbance existing high-speed railways. technical background [0002] At present, there are nearly 10,000 kilometers of high-speed railways in operation in my country, and tens of thousands of kilometers of high-speed railways are gradually being built and put into operation. Due to the influence of the natural environment, roadbed deformation and disease occur from time to time. At present, in the treatment of deformation diseases of ordinary railway subgrades, grouting measures are often used for the treatment of subgrade settlement diseases; for deformation diseases caused by foundation settlement, commonly used treatment measures include rotary grouting piles, mixing piles, reinforcement piles, and grouting. These remediation measures will cause large irreversible deformat...

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Problems solved by technology

[0004] 1) During the process of forming holes for reinforcement piles and grouting holes, it is easy to collapse the holes. Once the holes collapse, it will lead to aggravated deformation of the subgrade

[0005] 2) If the amount of grouting in a single hole is too large, or the grout diffusion range is too large, the grout cannot form strength in time in the filling, which will easily lead to softening of the reinforced soil and cause new subsidence, which will aggravate the deformation of the track

[0006] 3) Excessive grouting pressure or unreasonable pressure control will easily lead to uncontrollable deformations such as lifting and sinking of the subgrade surface, or damage existing equipment such as catenary columns on the subgrade, and more serious ones may lead to increased lateral deformation and even occurrence of lateral slip

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