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为了研究黄河三角洲地区地下咸水对水泥土搅拌桩复合地基承载特性的影响,对典型地段地下土和水进行了勘察分析,对含盐水泥土的劣化进行了试验研究,并基于Biot固结理论对含盐水泥土复合地基进行了固结分析。研究发现,地下水呈酸性,阳离子主要为K+、Na+,阴离子主要为Cl-、SO24-;盐对水泥土有较强的腐蚀作用,90d龄期含盐水泥土抗压强度比淡水环境降低18.5%,180d的降低了21.6%;水泥土劣化对超静孔隙水压力影响不明显;水泥土劣化使桩轴向应力水平提高15%以上;水泥土劣化使水平位移及竖向沉降都有所增大。这表明咸水腐蚀对水泥土复合地基承载性能的影响不可忽略,在设计和施工中应充分重视,需采取耐久性措施以保证道路服役期的安全运营。
In order to study the effect of groundwater saltwater in the Yellow River Delta on the bearing capacity of cement-soil mixing pile composite foundation, the underground soil and water in the typical section were surveyed and analyzed. The degradation of salt cement soil was tested and studied. Based on the Biot consolidation theory The soil-salt cement-soil composite foundation was consolidated. The study found that the groundwater is acidic, the main cation is K +, Na +, the anion is mainly Cl-, SO24-; Salt has a strong corrosion on the cement soil, compressive strength of salt cement soil 90d age lower than freshwater environment by 18.5% 180d decreased by 21.6%; cement soil degradation had no obvious effect on the excess pore water pressure; cement soil degradation increased the axial stress of the pile by more than 15%; cement soil degradation increased the horizontal displacement and vertical settlement. This shows that salt water corrosion on the bearing capacity of cement-soil composite foundation can not be ignored, should pay full attention to the design and construction, durability measures to be taken to ensure the safe operation of the road during the service period.