Method for determining pile spacing of anti-liquefying vibrating-impacting crushed-stone piles

Abstract

The invention discloses a method for determining the pile spacing of anti-liquefying vibrating-impacting crushed-stone piles. The method comprises the following steps of 1, judging the liquefied degree of foundation soil according to an in-situ test, wherein one or several methods in a, a critical standard penetration number method, b, a static sounding judging method and c, a shear-wave velocity method is or are adopted by the liquefaction judging method of the foundation soil; 2, determining the dry density needing to be reached by the foundation soil among the piles for eliminating liquefaction; 3, determining the pile spacing of the crushed-stone piles. According to the contrastive analysis of the on-site in-situ testing, the indoor test and the finite-element numerical-value analyzing results of the foundation soil before and after driving the crushed-stone piles, the anti-liquefying efficacy of the vibrating-impacting crushed-stone piles is comprehensive studied, and the method for determining the pile spacing of the crushed-stone piles is provided on the basis and on the basis of a compaction effect, so that pile-testing projects are omitted, the construction period is shortened, and the construction cost of the projects is lowered.

Description

technical field [0001] The invention relates to a method for determining the distance between anti-liquefaction vibro-shock gravel piles. Background technique [0002] The gravel pile composite foundation is composed of soil and gravel piles. The gravel pile composite foundation uses the vibration of the vibrator to form holes in the natural single soil foundation, and continuously adds crushed stones to vibrate and compact during the hole forming process, and finally forms a large-diameter dense crushed stone in the natural soil foundation The pile body, through continuous pile formation, finally forms a gravel pile composite foundation. [0003] The dynamic strength of the liquefied soil layer between the piles increases after being compacted and pre-shocked, and the drainage and decompression of the gravel piles significantly reduce the excess static pore pressure of the soil between the piles under the action of the earthquake. The stiffness of the pile body, the pile ...

AI Technical Summary

Problems solved by technology

The relationship between the number of standard penetration hits and the replacement rate given by the Japan Society of Construction Engineering and my country’s code for seismic design of buildings (GB50011-2010) only considers the compaction effect and pre-shock effect of vibro-vibration gravel piles, and does not consider the effect of earthquake motion. The drainage and shock absorption of the gravel piles, the pile spacing determined by this method is relatively safe, resulting in an increase in the total investment of the project

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