A method for vertical sampling of high-speed railway ballastless track subgrade soil

Abstract

The invention discloses a vertical sampling method for subgrade soil of a high-speed railway ballastless track. The upper structure of the ballastless track is drilled through special drilling equipment; based on the standard size of the upper structure of the track, when a hole drilled by a drilling machine reaches the position 3-5 cm from the bottom surface of a baseplate (or support layer), thehole continues drilling with a dry drilling method. Upon completion of drilling, a soil sampler is placed in the drilled hole, and connected to special hammer equipment; and the soil sampler is hammered into the subgrade soil by a hammer on the hammer equipment, and a connecting rod is replaced according to the position of the soil sampler in the hammering process in time. After the soil sampleris hammered to the predetermined position, the hammer equipment is removed; the connecting rod on the soil sampler is clamped by pipe tongs, and the soil sampler is rotated for 1-2 circles so that soil sample in the soil sampler is separated from the subgrade soil; and then the soil sampler is pulled out through a special press. Through analysis on the sol sample, scientific bases are provided forthe mechanism research and treatment measures for subgrade diseases of the high-speed railway ballastless track.

Description

technical field [0001] The invention relates to a method for vertical sampling of subgrade soil of ballastless track of high-speed railway, which is suitable for vertical sampling and analysis of subgrade soil of various types of ballastless track of high-speed railway in my country. Background technique [0002] High-speed railway roadbed is the basis for high-speed, stable and safe operation of trains. With the increase of train speed, vehicle axle load, operation volume and frequent occurrence of extreme weather (such as heavy rainfall, heavy snowfall, etc.), the current High-speed railway embankment diseases (such as embankment swelling and mud discharge, poor embankment drainage) are also becoming more and more prominent. In order to ensure the fast and safe operation of the high-speed railway, it is necessary to remediate the subgrade disease of the high-speed railway in time, so it is necessary to propose a corresponding subgrade disease remediation plan. Only when t...

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Problems solved by technology

Under normal circumstances, the skylight point for maintenance and operation is only 4 hours at most, and the effective operation time is less than 3 hours

At the same time, the on-track operation also has strict requirements on the working tools. The working tools should be as light and convenient as possible, and must meet the safe working height limit (less than 2.8m) of the high-speed railway ballastless track. Conventional geological drilling tools are not only bulky, but also The weight is also relatively large, and the assembly procedure is cumbersome, and it is easy to cause damage to the track structure during the drilling process; in addition, the conventional geological drilling sampling process is relatively rough, and the control of soil sample disturbance cannot be realized

For example, water-filled rotary drilling is used for rock core sampling, and static pressure sampling is used for argillaceous soil sampling. Some of these sampling techniques will have a great impact on the sampling of railway subgrade soil, and some even cannot be taken out. Soil samples, so conventional geological drilling can hardly be realized in the sampling of high-speed railway embankment soil, so it is urgent to find a drilling sampling method that can meet the operation requirements of high-speed railway without affecting driving safety, so that it can be used for high-speed railway Thoroughly analyze the mechanism of roadbed diseases, and provide scientific and effective basis for the treatment of roadbed diseases

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