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通过杭甬铁路客运专线柯桥特大桥单桩静载试验,桩身应变、桩身压缩量及桥墩沉降的测试,研究深厚软土地区桥梁桩基的荷载传递特性及沉降控制效果。结果表明:桩侧摩阻力先于桩端阻力发挥作用;尽管桩端置于强风化凝灰质砂岩上,但在试验荷载下2根超长试验桩的端承比均小于1.5%,桩的承载特性表现为摩擦桩的性质;单桩静载试验实测的桩身压缩量占桩顶沉降量的85%以上;桥墩浇筑完成后经过753d的沉降观测,2个试验墩实测沉降量分别为3.00和3.41mm,其中,无砟轨道铺设后300d的实测沉降分别为0.11和0.25mm,表明在深厚软土地区采用超长钻孔灌注桩控制桥梁基础沉降的效果显著。
Through the static load test, pile strain, pile compression and pier settlement of Keqiao Bridge over Hangzhou-Ningbo Railway Passenger Dedicated Railway, the load transfer characteristics and settlement control effects of bridge pile foundation in deep soft soil area are studied. The results show that the pile side frictional resistance plays a leading role in the pile tip resistance. Although the pile ends are placed on strongly weathered tuffaceous sandstone, the ultimate bearing ratios of two long test piles under the test load are both less than 1.5% The properties of the pile are the properties of the friction pile; the measured pile compression of the pile in the static load test accounts for more than 85% of the pile top settlement; after 753 days of settlement, the measured settlement of the two piers are 3.00 and 3.41mm, of which, 300d after ballastless track laying settlement were 0.11 and 0.25mm, indicating that the use of super-long bored piles in the deep soft soil subsidence control effect of the bridge foundation significantly.