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A Quantitative Method for Calculating the Settlement of Railway Subgrade After Loading and Preloading

A technology for railway subgrade and heap load preloading, applied in design optimization/simulation, instrumentation, geometric CAD, etc., can solve the problems of complex substrate treatment and construction, less quantitative analysis work, etc., to make up for data missing and reduce errors.

Active Publication Date: 2022-04-26
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The problem of subgrade settlement has always been the root cause of high-speed railway construction diseases, especially in the subgrade section of the station, where the base treatment and construction are complicated, and most of them are high-fill subgrades. The subgrade settlement of the station has always been a safety hazard during the construction and operation periods of high-speed railways. However, at present, most of the settlement analysis of subgrade base in China is only qualitative analysis, and the quantitative analysis work is relatively small, and some preliminary quantitative analysis is only the data analysis of the settlement to obtain qualitative results.

Method used

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  • A Quantitative Method for Calculating the Settlement of Railway Subgrade After Loading and Preloading
  • A Quantitative Method for Calculating the Settlement of Railway Subgrade After Loading and Preloading
  • A Quantitative Method for Calculating the Settlement of Railway Subgrade After Loading and Preloading

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Embodiment 1

[0045] Such as figure 1 As shown, the present embodiment provides a method for quantitatively calculating the settlement amount produced after the railway embankment is piled up and preloaded, which is characterized in that it includes the following steps:

[0046] 1) Determine the relationship between the settlement S and the base soil thickness h by the layered sum method, the process is as follows:

[0047] 1. Establish the calculation model of soil settlement;

[0048] Soil settlement means that when the soil is subjected to external forces and its stress state changes, the volume of the soil gradually compresses, and at the same time part of the water is discharged from the soil, and the applied stress is transferred from the pore water (and air) to the soil skeleton accordingly. The water pressure gradually dissipates to zero until the deformation reaches a plateau. The soil void ratio is the ratio of the pore volume in the soil to the volume of its solid particles, ex...

Embodiment 2

[0095] Such as Figure 5 As shown, the present embodiment provides a method for quantitatively calculating the settlement amount produced after the railway embankment is piled up and preloaded, which is characterized in that it includes the following steps:

[0096] 1) Determine the relationship between the settlement S and the base soil thickness h by the layered sum method;

[0097] 2) Survey the railway embankment that needs preloading and preloading, collect the geological data of the railway embankment basement by drilling samples, and make the basement geological profile;

[0098] 3) Due to the inconsistency in the settlement of compressive soil and non-compressive soil under the condition of surcharge preloading, the soil type of the railway embankment base soil is analyzed according to the base geological profile; according to the compressive strength of the base soil, the Subgrade base soil is divided into two categories: compressive soil and non-compressive soil; am...

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Abstract

The invention belongs to the technical field of railway embankment construction, and specifically relates to a method for quantitatively calculating the settlement amount generated after surcharged preloading of the railway embankment. 1) The relationship between the settlement amount S and the base soil thickness h is determined by a layered summation method; 2) Make the basement geological profile; 3) Establish the calculation formula model of the settlement S according to the relationship between the settlement S and the base soil thickness h; 4) Measure the settlement S of the settlement observation section; 5) Analyze the base soil thickness at the settlement observation section h; 6) Use the data of the settlement S and base soil thickness h to carry out nonlinear fitting on the calculation formula model to obtain the model coefficient; 7) Through the model coefficient and the calculation formula model of the railway subgrade settlement during the preloading period, calculate The settlement of the railway subgrade in the adjacent area or similar geological area after heaping and preloading. The method for quantitatively calculating the settlement provided by the present invention can be used to obtain the settlement near the unobserved section and make up for the lack of data in the sampling interval.

Description

technical field [0001] The invention belongs to the technical field of railway embankment construction, and in particular relates to a method for quantitatively calculating the subsidence of the railway embankment base soil after preloading and preloading according to the thickness of the base soil of the railway embankment. Background technique [0002] Due to the high speed of the train, the smoothness of the track is the key to optimizing the wheel-rail effect, and it is also one of the important factors to ensure driving safety and passenger comfort. In order to ensure safe and stable operation, high-speed railways have strict requirements on the smoothness of the track surface requirements, and the settlement deformation of structures has a direct impact on track smoothness. Scholars at home and abroad have found through research on the characteristics of subgrade settlement that subgrade settlement is caused by many factors. The difference in foundation treatment metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06F30/20G06F119/14
CPCG06F30/13G06F30/20
Inventor 陶灿饶雄马祥曹成度夏艳军滕焕乐闵阳董伟
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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