A reinforcement test and optimization method based on compaction effect

Abstract

The invention discloses a reinforcement test and optimization method based on the effect of compaction. The method is to drill a hole, install an earth pressure cell in the hole, and use a rammer to ram the soil in the hole to optimize the rammer. shape and number of tamps. The present invention measures the stable compaction force around the pile and the compaction force at the bottom of the pile through the earth pressure cell, and solves the problem of how to measure the compaction effect of the rammer; through the relationship between the compaction force, the compaction coefficient of the soil, and the tamping energy , put forward the method of optimizing the shape of the tamper, the number of times of tamping and the distance of the tamper, and solved the problem of which shape of the tamping tool can obtain the best tamping effect under the minimum compaction energy; Based on the relationship between the penetrating instruments, a method of measuring the compaction coefficient of the pile body by the penetration resistance is proposed, which reduces the disturbance to the ramming pile and reduces the energy loss during the ramming process. According to the principle that the compaction energy is minimum and the compaction force does not increase after the number of times of tamping exceeds a certain time, an optimal combination suitable for the existing railway is proposed.

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 effects. 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 compactio...

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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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