静钻根植桩水平承载性能试验研究
发布时间：2019-03-20 15:29
【摘要】：静钻根植桩是在水泥土中插入预应力管桩而形成的复合桩。为了认识其在水平荷载作用下的变形性能,实施了3组共6根桩的水平静载试验。第一组是φ600~φ750 mm静钻根植桩(SDRP),第二组是φ800~φ900 mm静钻根植桩,第三组是φ1 000 mm的钻孔灌注桩,第二组与第三组属于几何尺寸十分接近而组成材料不同,第一组与第二组属于组成材料相同而几何尺寸不同。对比水平力-水平位移、水平力-水平位移梯度以及水平变形比后发现,弹性阶段钻孔灌注桩的水平承载性能优于静钻根植桩,而弹性阶段以后则逐渐相反;静钻根植桩变形复原能力强于钻孔灌注桩;桩在弹性阶段的变形量与截面抗弯刚度成近似线性关系;如果只考察弹性阶段,为提高水平承载能力宜将静钻根植桩改为同直径的钻孔灌注桩,不宜单纯扩大静钻根植桩的桩径。
[Abstract]:Static drill root-planting pile is a composite pile formed by inserting prestressed pipe pile into cement-soil. In order to understand the deformation behavior of six piles under horizontal load, three groups of six piles were tested under horizontal static load. The first group is 蠁 600 ~ 蠁 750 mm (SDRP), the second group is 蠁 800 ~ 蠁 900 mm, the third group is 蠁 1000 mm bored pile. The second group is very close to the geometry size and the composition material is different from the third group. The first group belongs to the same composition material as the second group, but the geometric dimensions are different. After comparing horizontal force-horizontal displacement, horizontal force-horizontal displacement gradient and horizontal deformation ratio, it is found that the horizontal bearing capacity of bored pile in elastic stage is better than that of static drilling and planting pile, but gradually opposite after elastic stage. The deformation resilience of statically drilled pile is better than that of bored pile, and the deformation of pile in elastic stage has an approximate linear relation with the bending stiffness of cross-section. If the elastic stage is only investigated, it is appropriate to change the static drilling pile into the bored pile with the same diameter in order to improve the horizontal bearing capacity, and it is not appropriate to simply enlarge the pile diameter of the static drilling pile.
【作者单位】： 浙江大学滨海和城市岩土工程研究中心;
【基金】：高承台桩灾后无损检测及评估关键技术研究(No.51378464)
【分类号】：TU473.1
[Abstract]:Static drill root-planting pile is a composite pile formed by inserting prestressed pipe pile into cement-soil. In order to understand the deformation behavior of six piles under horizontal load, three groups of six piles were tested under horizontal static load. The first group is 蠁 600 ~ 蠁 750 mm (SDRP), the second group is 蠁 800 ~ 蠁 900 mm, the third group is 蠁 1000 mm bored pile. The second group is very close to the geometry size and the composition material is different from the third group. The first group belongs to the same composition material as the second group, but the geometric dimensions are different. After comparing horizontal force-horizontal displacement, horizontal force-horizontal displacement gradient and horizontal deformation ratio, it is found that the horizontal bearing capacity of bored pile in elastic stage is better than that of static drilling and planting pile, but gradually opposite after elastic stage. The deformation resilience of statically drilled pile is better than that of bored pile, and the deformation of pile in elastic stage has an approximate linear relation with the bending stiffness of cross-section. If the elastic stage is only investigated, it is appropriate to change the static drilling pile into the bored pile with the same diameter in order to improve the horizontal bearing capacity, and it is not appropriate to simply enlarge the pile diameter of the static drilling pile.
【作者单位】： 浙江大学滨海和城市岩土工程研究中心;
【基金】：高承台桩灾后无损检测及评估关键技术研究(No.51378464)
【分类号】：TU473.1
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