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槽段间接缝会导致圆形地下连续墙的环向刚度降低,但目前尚缺乏具体方法对刚度修正系数?定量取值,有必要进行深入研究。针对铣接接头地下连续墙,考虑槽段内及槽段间两个典型位置,采用施工现场的混凝土和泥浆制作了完整及含接缝的单元体试块,由力学试验获得了接缝的应力应变曲线,并采用三折线模型进行拟合。在此基础上,导得了环向刚度修正系数的计算公式,并进行了工程实例分析。研究表明:圆形地下连续墙环向刚度修正系数与槽段平均长度、接缝宽度、接缝与混凝土刚度等因素有关;当墙体环向应力较低时,环向刚度修正系数在0.485~0.514之间;环向应力超过7.37 MPa时,环向刚度修正系数值将有所提高,而环向应力达到11 MPa时,其值为0.545~0.581;采用本文获得的参数值对工程实例进行了分析,结果表明当地下连续墙环向应力较低时,采用单一的?系数可以较好考虑接缝影响,但当应力较高时,需考虑接缝非线性刚度的影响。
However, there is still a lack of concrete methods to quantitatively determine the stiffness correction coefficient? It is necessary to do further research. For the underground continuous wall of the milled joint, considering the two typical positions in the trough section and the trough section, a complete and seamed unit test block was made by using the concrete and mud in the construction site, and the stress of the joint was obtained by the mechanical test Strain curve, and the use of three-fold line model fitting. On this basis, the formulas for calculating the correction factor of the circumferential stiffness are derived, and the engineering examples are also analyzed. The results show that the coefficient of circumferential stiffness correction of circular underground continuous wall is related to the average length of groove segment, the width of joint, the joint and the stiffness of concrete. When the circumferential stress is low, the correction coefficient of circumferential stiffness is between 0.485 ~ 0.514; when the circumferential stress exceeds 7.37 MPa, the value of the correction coefficient of the circumferential stiffness will be increased, while the value of the circumferential stress reaches 11 MPa when the circumferential stress is 0.545 ~ 0.581. The engineering examples The results show that when the hoop stress in the underground continuous wall is low, the influence of the joint can be considered well by using a single factor. However, when the stress is high, the influence of the nonlinear stiffness of the joint must be considered.