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Design method for reinforcing railway karst roadbed with high-strength geotextiles

A design method and technology of geotextiles, applied in calculation, instrumentation, geometric CAD, etc., can solve problems such as lack of theoretical basis and design methods

Active Publication Date: 2018-06-01
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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Problems solved by technology

[0004] The main purpose of the patent of the present invention is to provide a design method for strengthening railway karst subgrade with high-strength geotextile to solve the problem of lack of theoretical basis and design method when using high-strength geotextile to strengthen railway karst subgrade in actual design

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  • Design method for reinforcing railway karst roadbed with high-strength geotextiles
  • Design method for reinforcing railway karst roadbed with high-strength geotextiles
  • Design method for reinforcing railway karst roadbed with high-strength geotextiles

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Embodiment

[0041] 1. Design parameters

[0042] The outcropping strata of the XLK4+540~XLK4+660 section of a certain line are karst rocks of the Lower Triassic Anshun Formation (T1a), and surface surveys show karst phenomena such as karst ditches, troughs, karst depressions, and karst caves. Geophysical prospecting shows that the karst in this section is strongly developed, and it is mainly dissolved and broken zones, filled caves, and dissolved crevices. Drilling revealed the existence of karst caves with a maximum diameter of 1.6m. The left side of the line is the existing ballastless track passenger transport line, and the new project is a low-speed ballasted line, the filling height is 4-6m, and the filling weight is taken as kN / m 3 . If the grouting reinforcement has a great impact on the existing line, the track slab of the ballastless track may be lifted by the grouting pressure. Therefore, it is considered to use high-strength geotextile combined with surface water anti-seepage...

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Abstract

A design method for reinforcing railway karst roadbed with high-strength geotextiles is provided, in order to solve the problem of lack of the theoretical basis and the design method when using high-strength geotextiles to reinforce the railway karst roadbed in actual design. The method is performed as the following steps: determining the size of the cavern and the upper load of the high-strengthgeotextile; determining the permissible value of the road surface deformation and the long-term strain and the creep strain tolerance of the high-strength geotextile; determining the ultimate strength, the short-term tension-strain relationship, and the long-term used tension-strain relationship of the high-strength geotextile; calculating the tension and the corresponding strain when the high-strength geotextile reaches the equilibrium position; calculating the deformation of the roadbed surface caused by deformation of the high-strength geotextile; calculating the long-term strain and the creep strain of the high-strength geotextile; and calculating the anchorage segment length to complete the design process.

Description

technical field [0001] The invention relates to a design method for reinforcing a railway karst subgrade with a high-strength geotextile. It belongs to the technical field of geotechnical engineering foundation treatment. Background technique [0002] With the rapid development of my country's railway construction, the number of railway subgrades passing through karst-developed areas has been increasing in recent years. The collapse of karst caves is sudden, which is extremely harmful to train operation. However, the development of karst caves is characterized by concealment and complexity. It is difficult for existing geological exploration methods to reveal their development characteristics effectively and comprehensively, which brings great challenges to karst renovation. greater difficulty. At present, methods such as filling, grouting and pile-slab structure are usually used to remediate karst, but the above methods have limitations. Refilling has high reliability an...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 薛元张东卿李安洪肖朝乾周波王智猛刘菀茹陈海军郑永飞代伟邱永平冯子亮
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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