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Evaluation method for the depth of dissolution impact of high-speed railway coarse-grained saline soil subgrade based on stress ratio method

A technology that affects the depth of high-speed railways. It is applied in the fields of instrumentation, geometric CAD, design optimization/simulation, etc. It can solve the problems of soaring engineering investment and increase the workload of survey and design, so as to achieve easy and fast operation, easy parameter testing and implementation process clear effect

Active Publication Date: 2022-05-10
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The deformation control requirements of high-speed railways are extremely high. For high-speed railway high embankments, once the estimated amount of saline soil filler dissolution is too large to meet the deformation control requirements, the proposed filler cannot be used to fill the embankment, and the requirements need to be selected again More stringent packing will not only increase the survey and design workload, but also easily lead to a surge in engineering investment

Method used

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  • Evaluation method for the depth of dissolution impact of high-speed railway coarse-grained saline soil subgrade based on stress ratio method
  • Evaluation method for the depth of dissolution impact of high-speed railway coarse-grained saline soil subgrade based on stress ratio method
  • Evaluation method for the depth of dissolution impact of high-speed railway coarse-grained saline soil subgrade based on stress ratio method

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Embodiment

[0044]A high-speed railway embankment is built in a saline soil area, and CRTS I type slab ballastless track is laid on the top surface of the embankment. Most of the borrow areas in this area are saline soil, so it is planned to collect coarse-grained saline soil from a certain site to be used as roadbed filler. Since the depth of dissolution is an important indicator for the calculation of high-speed railway subgrade dissolution, the survey and design It is necessary to reasonably determine the influence depth of subgrade dissolution in coarse-grained saline soil.

[0045] Adopt the method of the present invention below to evaluate this area coarse-grained saline soil embankment dissolution subsidence influence depth, concrete steps are as follows:

[0046] ① Determine the filling weight of the i-th layer of the roadbed by digging the hole and pouring sand γ i , i=1, 2, 3...; According to the design requirements of CRTS I type slab ballastless track, determine the self-weig...

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Abstract

The evaluation method for the depth of dissolution impact of high-speed railway coarse-grained saline soil subgrade based on the stress ratio method provides a basis for the evaluation of subgrade dissolution and can meet the needs of coarse-grained saline soil subgrade engineering design. Including the following steps: ① Determine the filling weight of the i-th layer of the roadbed γ i , according to the design requirements to determine the self-weight uniform load strength q of the track structure 1 ②Determine the additional stress generated by the self-weight load of the track structure at the depth z below the top surface of the subgrade; ③Determine the additional stress generated by the self-weight load between lines at the depth z below the top surface of the subgrade; ④Determine the depth z below the center of the line The additional stress generated; ⑤ Determine the self-weight stress generated at the depth z of the center of the line; ⑥ According to the calculation results of steps ④ and ⑤, judge Δσ z,RC / σ z,RC Is it equal to 0.05, if Δσ z,RC / σ z,RC = 0.05, then take the depth z of the corresponding soil layer below the top surface of the subgrade as the depth affected by subgrade dissolution in coarse-grained saline soil; if Δσ z,RC / σ z,RC ≠0.05, repeat steps ①~⑤ until Δσ z,RC / σ z,RC =0.05, to determine the depth of subsidence affected by coarse-grained saline soil embankment.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for evaluating the depth of dissolution impact of high-speed railway coarse-grained saline soil embankment based on a stress ratio method. [0002] technical background [0003] Saline soil is a general term for a class of soils with different degrees of salinization. It has special engineering characteristics such as dissolution, salt swelling and corrosion. Its complexity is far greater than that of permafrost, expansive soil and loess. Widely distributed in coastal areas. [0004] According to the requirements of the current "Building Code for Saline Soil Areas" (SY / T 0317—2012), when calculating the total amount of saline soil subsidence, all the subsidence saline soil below the foundation bottom should be included in the calculation range. This requirement applies to Self-weight collapsible saline soil, but it still has certain limitations for non-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06F30/20G06F119/14
Inventor 陈伟志李安洪刘刚姚裕春吴沛沛魏炜孙晓张莎莎周川滨朱曦
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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