Reinforcement testing and optimizing method based on compaction effect

Abstract

The invention discloses a reinforcement testing and optimizing method based on a compaction effect. The method optimizes the shape of a pounder and the pounding times through drilling, arrangement ofsoil pressure boxes into drilled holes and pounding of soil in the drilled holes by using the pounder. The pile periphery stable compaction force and the pile bottom compaction force are measured through the soil pressure boxes to solve the problem how to measure the compaction effect of the pounder; through the relation among the compaction force, the soil compaction coefficients and the poundingenergy, a method for optimizing the shape of the pounder, the pounding times and the drop distance of the pounder is provided to solve the problem which compaction tool can obtain optimal compactioneffect under the lowest compaction energy; and the relation between pile body compaction coefficients and a micro inserter is built, and a method for measuring the pile body compaction coefficients byinsertion resistance is provided, so that the disturbance on pounding piles is reduced, and the energy loss in the pounding process is reduced. Based on the principle of basically not increasing thecompaction force when the compaction energy is the lowest and the pounding times do not exceed one time, an optimal combination suitable for existing railway is provided.

Description

technical field [0001] The invention relates to the technical field of construction, in particular to a reinforcement test and optimization method based on compaction effect. Background technique [0002] At present, many existing railways in China cannot meet the needs of the surge of passengers and freight, and need to be upgraded to speed up. However, the bearing capacity of the existing railway subgrade may be insufficient. At present, cement-soil compaction piles are often used for subgrade reinforcement. Cement-soil compaction pile reinforcement is a method of mechanically forming holes in the existing railway foundation bed, the diameter of which is slightly smaller than the distance between sleepers, and then layering and compacting a mixture of cement and plain soil in the holes. After the reinforcement is completed, the mixture of cement and plain soil solidifies into a cement-soil pile with good uniformity and high strength. At the same time, during the compaction...

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Problems solved by technology

[0018] The purpose of the present invention is to provide a kind of reinforcement test and optimization method based on the compaction effect, measure the stable compaction force around the pile and the compaction force at the bottom of the pile through the earth pressure cell, and solve the problem of how to measure the compaction effect of the rammer; The relationship between compaction force, soil compaction coefficient, and tamping energy, and a method to optimize the shape of the rammer and the number of tamping times are proposed, and the problem of which shape tamping tool can obtain the best tamping effect at the minimum compaction energy is solved. Problem: The relationship between the compaction coefficient of the pile body and the micro-penetrator was established, and a method for measuring the compaction coefficient of the pile body by the penetration resistance was proposed, which reduced the disturbance to the ramming pile and at the same time reduced the impact caused by the ramming process. The energy loss caused by the ring knife method pit; according to the principle of the minimum compaction energy and the principle that the number of tamping times exceeds a certain number of times and basically does not increase, a combination suitable for the optimization of the existing railway is proposed

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