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通过在基坑支护桩中埋置应力计,跟踪测试基坑在开挖过程中桩身弯矩和桩顶位移的变化,研究支护桩荷载传递规律。同时选择上三角、全三角、梯形三种土压力分布模式,分别应用土抗力法的m法、c法和k法对支护桩的桩身弯矩进行了理论计算,并把计算结果与实测结果进行对比分析。结果表明:对于支护桩弯矩而言,无论采用何种土压力模式,m法的计算结果与实测结果相差较大;k法计算的最大正弯矩与实测值比较接近,但最大负弯矩偏大;c法计算的最大正弯矩偏于不安全,最大负弯矩过大。
By embedding the stress meter in the foundation pit supporting pile and tracking the change of pile body bending moment and pile top displacement during excavation, the law of load transfer of the supporting pile is studied. At the same time, the three kinds of earth pressure distribution modes of upper triangular, full triangular and trapezoid are selected, the pile bending moment of the supporting pile is calculated theoretically by m method, c method and k method of soil resistance method respectively, and the calculation results are compared with the measured The results of comparative analysis. The results show that for the moment of supporting pile, no matter what kind of earth pressure mode is adopted, the calculated result of m method is quite different from the measured result. The maximum positive moment calculated by k method is close to the measured value, but the maximum negative bend The moment is too large. The maximum positive moment calculated by c method is unsafe and the maximum negative moment is too large.