Rapid compacting method for loess subgrade

Abstract

The invention relates to a rapid compacting method for a loess subgrade. The method comprises the following steps of (1) selecting a mechanical combination, wherein the mechanical combination includes 1-2 vibratory rollers YZ-18T, which wears cam armors, and an iron three-wheel road roller 3YJ-21T with a sand filling counterweight; (2) determining horizontal layered construction rolling thickness as compactness thickness, wherein the compactness thickness is no more than 30cm; (3) leveling up the loess subgrade; (4) determining natural water content of loess; and (5) exerting the road roller to perform rolling operation along a road, wherein the vibratory rollers YZ-18T and the iron three-wheel road roller 3YJ-21T are exerted to roll once in sequence according to a rolling speed of no more than 1.7 km / h; the vibratory roller YZ-18T vibrates intensively at a gear I, and the vibration track of the vibratory roller YZ-18T is coincided with 90% of the whole width of a cam; the iron three-wheel road roller 3YJ-21T statically rolls at a gear I or a gear II, and wheel marks of rear wheels are coincided for 30-50 cm; and the compactness of the loess subgrade can be detected by using a sand filling method after once rolling is finished; if the compactness of the loess subgrade does not satisfy standard requirements, the vibratory rollers YZ-18T and the iron three-wheel road roller 3YJ-21T are exerted to roll once again at most; and the total rolling times do not exceed twice. The rapid compacting method for the loess subgrade, provided by the invention, is advantaged in that the method is rapid and economic and the quality standard of the loess subgrade is high.

Description

technical field [0001] The invention relates to the field of highway subgrade earthwork construction, in particular to a method for rapid compaction of loess subgrade. Background technique [0002] At present, my country's highway industry standard JTGF10-2006 "Technical Specifications for Highway Subgrade Construction" P91 Table 4-1 has made a general selection of compaction machinery for different filler subgrades. The on-site control is not targeted and the operability is not strong—for example, ① During the construction of loess subgrade, according to the regulations, the rolling should be carried out when the water content is close to the optimum, but what is the specific scope of on-site control? ② There are many options for road rollers, such as light wheel, vibration, cam, claw roller, tire roller, etc. Which combination is the most effective and versatile with the least investment? ③ During the rolling process, the wheel tracks of the road roller generally overlap b...

AI Technical Summary

Problems solved by technology

In order to overcome the inherent problems of this special subgrade, the most direct engineering measure is to strictly control the degree of compaction of the loess subgrade. However, the current highway capital construction projects have an increasing amount of work and a tighter construction period. The experience has not formed a standardized and standardized construction process, and the on-site technicians lack construction experience and have no direct reference data and materials to guide the construction, resulting in various compaction methods for specific construction projects and unreasonable equipment investment. The construction period caused a certain delay, and the subgrade construction quality was highly discrete, and engineering defects such as uneven subsidence frequently occurred