海上风电复合筒型基础粉质黏土下沉试验分析
发布时间：2018-08-30 18:27
【摘要】：复合筒型基础的沉放是一项关键施工过程.沉放时土体在施工负压下受到扰动,土体中土压力和孔隙水压力发生变化,对沉贯阻力造成影响.针对复合筒型基础的沉放过程,在粉质黏土中开展了大比尺模型试验.试验中监测了基础舱内压力、周围土体的土压力及孔隙水压力的变化.通过理论计算,对试验模型沉贯所需负压进行预测,并将试验施加负压与预测负压进行对比.试验结果表明:基础周围土体土压力和孔隙水压力在负压作用下均减小,且筒壁内侧土体土压力减小程度大于外侧土体;沉放过程中基础发生倾斜时,通过向高舱处抽负压可以有效调整基础的倾斜度;预测负压大于试验施加负压,当使用Houlsby提出的计算方法计算筒型基础在粉质黏土中的沉贯阻力时,摩擦系数建议取0.3.
[Abstract]:Sinking and laying of composite cylindrical foundation is a key construction process. The soil pressure and pore water pressure in the soil are affected by the disturbance of the soil under the negative pressure of the construction, which has an effect on the penetration resistance of the soil. A large scale model test was carried out in silty clay for the settlement process of composite cylindrical foundation. The change of pressure in foundation cabin, soil pressure of surrounding soil and pore water pressure were monitored. Through theoretical calculation, the negative pressure required by the test model is predicted, and the negative pressure applied in the test is compared with the predicted negative pressure. The test results show that the soil pressure and pore water pressure around the foundation decrease under negative pressure, and the decrease of soil pressure inside the cylinder wall is greater than that of the outside soil. The slope of the foundation can be adjusted effectively by pumping negative pressure to the high tank, and the negative pressure is predicted to be greater than the negative pressure applied in the test. When the calculation method proposed by Houlsby is used to calculate the sinking resistance of the cylindrical foundation in silty clay, the friction coefficient is suggested to be 0.3.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;滨海土木工程结构与安全教育部重点实验室(天津大学);天津大学建筑工程学院;
【基金】：国家自然科学基金资助项目(51379142) 天津市自然科学基金资助项目(17JCYBJC22000) 创新方法工作专项资助项目(2016IM030100)~~
【分类号】：TM614
本文编号：2213930
[Abstract]:Sinking and laying of composite cylindrical foundation is a key construction process. The soil pressure and pore water pressure in the soil are affected by the disturbance of the soil under the negative pressure of the construction, which has an effect on the penetration resistance of the soil. A large scale model test was carried out in silty clay for the settlement process of composite cylindrical foundation. The change of pressure in foundation cabin, soil pressure of surrounding soil and pore water pressure were monitored. Through theoretical calculation, the negative pressure required by the test model is predicted, and the negative pressure applied in the test is compared with the predicted negative pressure. The test results show that the soil pressure and pore water pressure around the foundation decrease under negative pressure, and the decrease of soil pressure inside the cylinder wall is greater than that of the outside soil. The slope of the foundation can be adjusted effectively by pumping negative pressure to the high tank, and the negative pressure is predicted to be greater than the negative pressure applied in the test. When the calculation method proposed by Houlsby is used to calculate the sinking resistance of the cylindrical foundation in silty clay, the friction coefficient is suggested to be 0.3.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;滨海土木工程结构与安全教育部重点实验室(天津大学);天津大学建筑工程学院;
【基金】：国家自然科学基金资助项目(51379142) 天津市自然科学基金资助项目(17JCYBJC22000) 创新方法工作专项资助项目(2016IM030100)~~
【分类号】：TM614
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