Stress ratio method-based high-speed railway coarse-grained salinized soil roadbed thaw collapse influence depth evaluation method

Abstract

The invention discloses a stress ratio method-based high-speed railway coarse-grained salinized soil roadbed thaw collapse influence depth evaluation method, provides a basis for roadbed thaw collapseamount evaluation, and can meet the requirements of coarse-grained salinized soil roadbed engineering design. The method comprises the following steps: (1) determining the weight gamma i of the ith layer of filling soil of a roadbed, and determining parameters such as track structure self-weight uniform distribution load strength q1 according to design requirements; (2) determining additional stress generated by the dead load of the track structure at the depth z below the top surface of the roadbed; 3, determining additional stress generated by the inter-line backfill dead load at the depthz below the top surface of the roadbed; (4) determining additional stress generated at the depth z below the center of the line; 5, determining self-weight stress generated at the depth z below the center of the line; (6) judging whether delta sigma z, RC / sigma z and RC are equal to 0.05 or not according to calculation results of the step (4) and the step (5), and if delta sigma z, RC / sigma z andRC are equal to 0.05, taking the corresponding soil layer depth z below the top surface of the roadbed as the influence depth of the melt subsidence of the coarse-grained salinized soil roadbed; and if delta sigma z, RC / sigma z and RC are not equal to 0.05, repeating the work of the steps (1)-(5) until delta sigma z, RC / sigma z and RC are equal to 0.05, so as to determine the influence depth of the melt subsidence of the coarse-grained salinized soil roadbed.

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...

AI Technical Summary

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

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