软土地基超长桩桩身压缩和稳定性研究
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摘要
混凝土灌注超长桩被越来越多的建(构)筑物采用,但超长桩的理论研究还落后于工程实践,尤其是超长桩桩身压缩量、桩身失稳的研究还比较欠缺。本课题就此开展研究。
本文首先阐述了钢筋、混凝土的力学性状和超长桩特殊的工作性状。提出由于钢筋混凝土材料单向受压应力状态与多向受压应力状态下的力学反应不相同,因此用混凝土的弹性模量模拟桩身变形模量,并用此参数来计算桩身在土压力中的压缩量是不合理的。
采用新的方法计算了桩身混凝土的变形模量。考虑了配筋对桩身变形模量的影响,利用钢筋、混凝土的全应力应变曲线在不同的配筋条件下得出了不计入箍筋的环箍作用和计入箍筋环箍作用的完整的桩身模量计算值。并推导了计入配筋影响的桩身压缩弹性公式。
桩的长径比过大且桩侧土为软弱土时,需要验算桩的稳定性。本文采用伽辽金法,假定侧摩阻沿桩身为均匀分布或三角分布,土侧压力采用m法为基础的地基反力,得出了不同情况下的临界压力。
本文通过对1800根静载试桩的统计数据分析得到:桩身压缩量随荷载水平和桩长的增加而增加,当荷载和桩长大于一定值后,压缩量的变化趋势平缓。桩长越长用规范公式计算得出的计算值误差就越大。提出用Ψ=ξ_eE_c/E_s作为统计量来联合反映桩身压缩系数和桩身变形模量与混凝土弹性模量的差别。并得到线性回归的计算公式。最后通过工程实例进行了验算并提出了相关工程建议:对箍筋加强范围的计算提出了自己的公式。
First of all, the characteristics of concrete, reinforcing bar and super-long pile are presented. And then it put forth that it is unreasonable to use the concrete elastic modulus to simulate the response of the pile embedded into soils because of the difference between the elastic modulus of concrete and the deformation modulus of pile shaft. This difference is mainly due to that the responses of concrete subjected to uniaxial stress and tri axial stress are different.
In the next part, a new method is developed to calculate the deformation modulus of pile shaft. In this model, the influence of the reinforcement ratio on the deformation modulus of pile shaft is taken into account, and based on the whole stress-strain curves, the values of the deformation modulus of pile shaft are obtained considering the strengthen influence of the reinforcement hooped spiral. Furthermore, the formula of the elastic compression of pile is derived considering the effect of the reinforcement.
The stability of the super-long pile embedded into soft soils should be considered. Herein the assumptions of the triangular distribution and uniform distributed are adopted to simulate the pile side resistance, and M-method is used to simulate the soil counterforce. And then the critical load is given using the Galerkin method.
Form the data of 1800 piles, it can be concluded that the compression of pile shaft increases with increasing pile length and loading level, and the increased trend is not significant when the pile length and pile head load are larger than a certain value. The error between the measured and the calculated value of the compression of pileshaft increases with increasing pile length. Moreover, a statistical coefficientΨ=ξ_eE_c/E_s, isused to present the pile compression coefficient and the error between the elastic modulus of concrete and the deformation modulus of pile shaft. In addition, a linear regression formula is given. In the last of this paper, the rationality of the proposed method is proven using an engineering example, and some suggestions for the engineering practice are put forward.
本文首先阐述了钢筋、混凝土的力学性状和超长桩特殊的工作性状。提出由于钢筋混凝土材料单向受压应力状态与多向受压应力状态下的力学反应不相同,因此用混凝土的弹性模量模拟桩身变形模量,并用此参数来计算桩身在土压力中的压缩量是不合理的。
采用新的方法计算了桩身混凝土的变形模量。考虑了配筋对桩身变形模量的影响,利用钢筋、混凝土的全应力应变曲线在不同的配筋条件下得出了不计入箍筋的环箍作用和计入箍筋环箍作用的完整的桩身模量计算值。并推导了计入配筋影响的桩身压缩弹性公式。
桩的长径比过大且桩侧土为软弱土时,需要验算桩的稳定性。本文采用伽辽金法,假定侧摩阻沿桩身为均匀分布或三角分布,土侧压力采用m法为基础的地基反力,得出了不同情况下的临界压力。
本文通过对1800根静载试桩的统计数据分析得到:桩身压缩量随荷载水平和桩长的增加而增加,当荷载和桩长大于一定值后,压缩量的变化趋势平缓。桩长越长用规范公式计算得出的计算值误差就越大。提出用Ψ=ξ_eE_c/E_s作为统计量来联合反映桩身压缩系数和桩身变形模量与混凝土弹性模量的差别。并得到线性回归的计算公式。最后通过工程实例进行了验算并提出了相关工程建议:对箍筋加强范围的计算提出了自己的公式。
First of all, the characteristics of concrete, reinforcing bar and super-long pile are presented. And then it put forth that it is unreasonable to use the concrete elastic modulus to simulate the response of the pile embedded into soils because of the difference between the elastic modulus of concrete and the deformation modulus of pile shaft. This difference is mainly due to that the responses of concrete subjected to uniaxial stress and tri axial stress are different.
In the next part, a new method is developed to calculate the deformation modulus of pile shaft. In this model, the influence of the reinforcement ratio on the deformation modulus of pile shaft is taken into account, and based on the whole stress-strain curves, the values of the deformation modulus of pile shaft are obtained considering the strengthen influence of the reinforcement hooped spiral. Furthermore, the formula of the elastic compression of pile is derived considering the effect of the reinforcement.
The stability of the super-long pile embedded into soft soils should be considered. Herein the assumptions of the triangular distribution and uniform distributed are adopted to simulate the pile side resistance, and M-method is used to simulate the soil counterforce. And then the critical load is given using the Galerkin method.
Form the data of 1800 piles, it can be concluded that the compression of pile shaft increases with increasing pile length and loading level, and the increased trend is not significant when the pile length and pile head load are larger than a certain value. The error between the measured and the calculated value of the compression of pileshaft increases with increasing pile length. Moreover, a statistical coefficientΨ=ξ_eE_c/E_s, isused to present the pile compression coefficient and the error between the elastic modulus of concrete and the deformation modulus of pile shaft. In addition, a linear regression formula is given. In the last of this paper, the rationality of the proposed method is proven using an engineering example, and some suggestions for the engineering practice are put forward.
引文
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