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

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 subgrade 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 muddying, 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 the action mechani...

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