High-speed railway soft rock deep cutting arch-up deformation control structure and construction method

Abstract

The invention discloses a high-speed railway soft rock deep cutting arch-up deformation control structure and a construction method. Continuous arch-up deformation of a high-speed railway deep cuttingin a soft rock area can be effectively controlled, rock body stress distribution can be adjusted, adjacent slopes can be reinforced, and then the construction cost can be reduced. The high-speed railway soft rock deep cutting arch-up deformation control structure comprises a ballastless track roadbed constructed on a soft rock base bed, the two sides of the ballastless track roadbed are providedwith right-side resisting piles and left-side resisting piles at intervals on a right-side slope body and a left-side slope body in the line direction, and the right-side resisting piles and the left-side resisting piles go deep into a certain depth under the base bed elevation. A reinforced concrete arc-shaped plate which is symmetrical along the central line of the roadbed and concaved downwardsis arranged on the top face of the soft rock base bed, and the two transverse sides of the reinforced concrete arc-shaped plate are rigidly connected with the right-side resisting piles and the left-side resisting piles to form a whole; and a water isolating cushion layer is arranged on the top face of the reinforced concrete arc-shaped plate, and the ballastless track roadbed is arranged on thewater isolating cushion layer in a filling manner.

Description

technical field [0001] The invention relates to a high-speed railway embankment, in particular to a high-speed railway soft rock deep cutting arch deformation control structure and a construction method. Background technique [0002] In recent years, my country's high-speed railway has developed rapidly. There are a large number of soft rock deep cuttings in high-speed railway. The soft rock has low strength and has certain expansibility and rheology. The mechanical properties will deteriorate with time, which will cause the arching disease of the high-speed railway deep cutting. The high-speed railway is extremely sensitive to the buckling deformation, the adjustable deformation capacity of the fasteners is low, and the post-regulation is extremely difficult, so effective engineering measures must be taken to control the buckling deformation of the subgrade. [0003] At present, two methods are mainly used to control the arching of soft rock deep cuttings: one is to excavat...

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Problems solved by technology

However, the design of these two methods must be based on the accurate prediction of the depth of the arching rock mass on the basement (or the depth of unloading influence) and the total amount of arching deformation during the operation period. If the prediction of the amount of arch deformation is wrong, it will face the risk of over-limit deformation during the operation period of the line and the risk of rework

In view of the complexity of the mechanical properties of soft rock, and the high-speed railway as a century-old project, its operation time is long, and it is currently impossible to accurately predict the depth of the arch rock layer on the roadbed and the amount of arch deformation during the operation period

Therefore, to achieve long-term effective control of subgrade arching deformation through these two methods, the engineering volume will be very huge and the reliability will be poor

[0004] According to the inventor's research on the mechanism of the soft rock subgrade arching, the internal reason for the continuous arching of the soft rock embankment of the high-speed railway is the expansion and rheology of the soft rock, that is, after the disturbance of the line construction, the stress field in the originally stable rock mass Under the new stress and water environment, the soft rock produces expansion-rheological coupling deformation, which causes the deformation of the subgrade arch; at the same time, this deformation has significant timeliness, and it will last for a long time during the operation period of the line. Difficult to converge and unpredictable

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