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为确保某码头堆场堆取料机轨道梁运行安全,在采用真空联合堆载预压法地基处理的基础上,需对其进行二次地基处理。综合比较水泥搅拌桩、高压旋喷桩和CFG桩复合地基三种不同处理方案的优缺点,结合工程实际条件,拟选取高压旋喷桩复合地基法。利用数值方法计算分析了不同桩长(10m、18m)高压旋喷桩复合地基的应力-应变过程,结果表明若采用桩长18m的高压旋喷桩进行二次地基处理,轨道梁地基沉降量将由二次处理前的37cm减小至14cm,水平位移由11cm减小至7cm,二次处理效果较为显著,能够满足使用要求。
In order to ensure the safe operation of the track beam of the picker of a terminal yard, it is necessary to carry out the second foundation treatment on the basis of vacuum combined with preloading method. The advantages and disadvantages of three different treatment schemes of cement mixing piles, high pressure rotary jet grouting piles and CFG composite piles were comprehensively compared. Based on the actual engineering conditions, the composite foundation method of high pressure rotary jet grouting piles was proposed. The stress-strain process of high pressure jet grouting pile composite foundation with different pile lengths (10m, 18m) is calculated and analyzed by numerical method. The results show that if subgrade is treated with high pressure jet grouting pile with pile length 18m, 37cm before secondary treatment reduced to 14cm, the horizontal displacement reduced from 11cm to 7cm, secondary treatment effect is more significant, to meet the requirements.