摘要：【中文】本发明提供了一种适用于钢管桩桩内侧摩擦阻力测定装置及测定方法，包括外筒、内筒、内筒荷载传感器和应变测试系统，所述应变测试系统包括应变片和内筒荷载传感器；在所述外筒内设置所述内筒，在内筒顶部外筒内设有内筒荷载传感器，在外筒外侧和内筒内侧布设应变片；所述的内筒为外径略小于外筒内径的两端开口圆筒，内筒上部通过内筒荷载传感器紧抵外筒的筒盖板，使得内筒处于轴向预荷载状态。本发明装置可实现大管径钢管桩的桩内和桩外侧摩擦阻力和桩端部承载力的精确测定，定量精确研究桩内土塞效应。 【EN】The invention provides a device and a method for measuring the friction resistance of the inner side of a steel pipe pile, wherein the device and the method comprise an outer cylinder, an inner cylinder load sensor and a strain test system, wherein the strain test system comprises a strain gauge and an inner cylinder load sensor; the inner cylinder is arranged in the outer cylinder, an inner cylinder load sensor is arranged in the outer cylinder at the top of the inner cylinder, and strain gauges are distributed on the outer side of the outer cylinder and the inner side of the inner cylinder; the inner cylinder is a cylinder with two open ends and the outer diameter of the cylinder is slightly smaller than the inner diameter of the outer cylinder, and the upper part of the inner cylinder is tightly propped against a cylinder cover plate of the outer cylinder through an inner cylinder load sensor, so that the inner cylinder is in an axial preload state. The device can realize the accurate measurement of the frictional resistance in and outside the pile and the bearing capacity of the end part of the pile of the large-diameter steel pipe pile, and quantitatively and accurately research the soil plug effect in the pile.