层状地基中静钻根植竹节桩单桩沉降计算

发布时间：2018-12-25 16:46

【摘要】：静钻根植竹节桩是一种由预制桩和水泥土组合而成的组合桩基,通过将预制桩和水泥土的复合弹性模量作为其桩身弹性模量,同时考虑桩身弹性模量沿桩身改变以及桩端水泥土扩大头的作用,采用理想弹塑性荷载传递函数提出了一种在均匀地基中静钻根植竹节桩单桩沉降计算方法。在此基础上,提出了静钻根植竹节桩在层状地基中荷载-位移曲线的递推计算方法。用所提出的计算方法对实际工程中的静钻根植竹节桩试桩的荷载-位移曲线进行计算,并与实测曲线进行比较,验证了所提计算方法的可靠性。选取土体基于预制桩的桩侧摩阻力值作为静钻根植竹节桩的侧摩阻力,计算所得极限承载力与实测极限承载力接近,说明静钻根植竹节桩桩-土接触面摩擦性质与预制桩桩-土接触面摩擦性质相似,且优于钻孔灌注桩桩-土界面摩擦性质。
[Abstract]:Static drilling-rooted bamboo section pile is a kind of composite pile foundation composed of prefabricated pile and cement soil. The composite elastic modulus of prefabricated pile and cement soil is taken as the elastic modulus of pile body. Considering the change of elastic modulus of pile body along the pile body and the function of cement soil expansion head at the end of the pile, a method for calculating the settlement of single pile with static drilling and planting bamboo section pile in uniform foundation is presented by using the ideal elastic-plastic load transfer function. On this basis, a recursive calculation method of load-displacement curve of static drilling-rooted bamboo section pile in layered foundation is proposed. The proposed method is used to calculate the load-displacement curve of the static drilling-rooted bamboo section pile in practical engineering, and compared with the measured curve, the reliability of the proposed calculation method is verified. The pile side friction value based on precast pile is chosen as the lateral friction resistance of the static drilling and planting bamboo section pile. The calculated ultimate bearing capacity is close to the measured ultimate bearing capacity. It is shown that the frictional properties of the static drilling-planted bamboo joint pile-soil interface are similar to those of the prefabricated pile-soil interface and are superior to that of the bored cast-in-place pile-soil interface.
【作者单位】：浙江大学滨海和城市岩土工程研究中心;浙江大学软弱土与环境土工教育部重点实验室;中淳高科桩业股份有限公司;
【基金】：国家自然科学基金(No.51378464,No.51578498,No.51579217)~~
【分类号】：TU473.1

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