High-speed railway wide and large embankment settlement control method adopting cement mixing piles

Abstract

The invention relates to a high-speed railway wide and large embankment settlement control method adopting cement mixing piles. The reinforcing method comprises the following steps: a chemical improved soil layer is filled on the foundation of the reinforced high-speed railway embankment; pile point positions of cement mixing piles are designed on the chemical improvement soil layer, the depths of the cement mixing piles at all the pile point positions are designed according to the pile point positions of the cement mixing piles, the cement mixing piles are driven into all the pile point positions, a cushion layer is laid on the chemical improvement soil layer, and a foundation bed bottom layer and a foundation bed surface layer are sequentially filled on the cushion layer. Compared withthe prior art, chemical improved soil is used as embankment filler under a foundation bed layer; the cement mixing piles are used for reinforcing the chemically-improved soil layer, the depth and density of the cement mixing piles are reduced along with increase of the distance between the pile point positions and the reinforcing area under the main line, on the premise that the safety performanceof the embankment is guaranteed, the economic cost of the embankment is reduced, and the embankment settlement amount is prevented from exceeding the high-speed railway design specification requirement.

Description

technical field [0001] The invention relates to a method for controlling the settlement of a wide embankment of a high-speed railway, in particular to a method for controlling the settlement of a wide embankment of a high-speed railway using cement mixing piles. Background technique [0002] At present, high-speed railway lines include the main line and the arrival and departure lines. The main line is generally located in the middle of the subgrade of the station. Therefore, the width of the embankment at the station is very large, and the cyclic load applied to the embankment by the train will cause the embankment to settle. At present, the settlement control standard of the embankment below the main line of the high-speed railway station embankment is the highest. In order to prevent the settlement of the main line from exceeding the requirements of the "High-speed Railway Design Code", high-quality fillers are currently used for the entire section of the wide embankment....

AI Technical Summary

Problems solved by technology

[0003] However, the speed of trains arriving and departing at high-speed railway stations in my country is controlled by the highest lateral speed of 160km / h. At the same time, considering the safety of passengers, the actual speed of trains arriving and departing is very low, which causes the degree of uneven settlement of the station embankment to be much smaller than normal. line, so in reality, the standard of wide embankment filler required to reach the hair line is relatively low

However, in the current standard, the entire section of embankment at the station is filled according to the high-speed railway standard. In order to prevent the embankment from settling, the same high-quality filler is used at the same level as the main line and the arrival-departure line. Uneconomical Construction of Station Embankment Engineering

[0004] The existing fillers can choose A, B, and C three types of fillers. In order to avoid the settlement of the main line exceeding the requirements of the "High-speed Railway Design Code" in the current project, the fillers must use relatively high-quality A and B fillers, and the C-type fillers have engineering properties It is difficult to use this type of filler alone to meet the long-term safe and comfortable operation requirements of high-speed railways, while the chemically modified soil is the worst of the C-type fillers. It has low cost and a wide range of applications, but its mechanical properties and durability are unstable. , it is not recommended to use when conditions permit

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