Model test device and test method for high-speed railway subgrade passing through karez

Abstract

The invention relates to a model test device for a high-speed railway subgrade passing through a karez. The device is mainly characterized in that a test box body is mounted below a cross beam of a reaction frame, and organic glass plates are arranged at the front part and the rear part of the test box body; the box body is filled with model soil in which tracer particles are buried; and a PVC vertical pipe and a PVC longitudinal pipe are arranged in the model soil; a railway subgrade is arranged on the top surface of the model soil; multiple layers of stiffened strips are arranged in the railway subgrade, a concrete base plate is laid on the upper portion of the railway subgrade, and a jack on the cross beam is arranged over a concrete plate; a vibration exciter and a displacement meter are arranged on the concrete base plate; three strain gauges are arranged on the model geogrids of the stiffened strips; three soil pressure boxes are vertically arranged on the railway subgrade, and three lateral soil pressure boxes and two strain gauges are arranged on the PVC vertical pipe; and a particle image velocimeter is arranged on the outer side of the test box body. According to the invention, the mechanical properties of the subgrade and the karez foundation under the train load can be obtained, so that a test basis is provided for reinforcement design and construction of the subgrade and the foundation of the high-speed railway in the karez region.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a model test device and test method for a high-speed railway subgrade passing through Karez. Background technique [0002] Karez is an ingenious irrigation and water delivery structure used in desert areas. Its main components are shafts, underground culverts and surface open channels. The principle of its structure is: in the undercurrent of the alpine snowfield, look for the water source, and then from the high water source to the low ground open channel, drill shafts with gradually shallower depths from top to bottom according to a certain interval, and then pass through the bottom of the shaft. Digging culverts connects water sources, vertical wells and surface open channels through culverts, so as to divert groundwater from high places to low surface open channels, and the surface open channels carry out irrigation and water supply. Karez is mainly distributed in Xi...

AI Technical Summary

Problems solved by technology

However, the effect of these reinforcement measures depends only on theoretical calculation and analysis, and its error is large, which cannot reliably guarantee the safety of the high-speed railway embankment and the normal use of Karez wells.

Images