Method for measuring volume of rock-fill dam test pit through handheld three-dimensional laser scanning

The invention discloses a method for measuring a volume of a rock-fill dam test pit through handheld three-dimensional laser scanning. The method comprises the following steps: firstly, leveling a dam charge level, placing a lantern ring, and excavating the test pit; then, according to the diameter and depth of the test pit and the stacking and filling material, determining the dot spacing, the laser color and the scanning mode; using a handheld color three-dimensional scanner to extend into the test pit, scanning according to the curvature of the pit wall from small to large, processing obtained point cloud: denoising, simplifying, packaging and filling, and then selecting a circle of annular area on the top of the test pit model for optimal plane fitting; finally, taking the fitting plane as an xoy plane, and enabling the z-axis direction to face downwards; and projecting the whole test pit model to the xoy plane, enabling the projection area to be an integral interval S, calculating the volumes of the smal