Abstract: A multifunctional and modular geotechnical testing device for testing a soil sample is provided. The testing device includes a testing cell, a plurality of needle probes, and a plurality of lateral pressure-measuring sensors. The testing cell has an oedometer ring for accommodating the soil sample, with a plurality of holes located on and angularly distributed over an internal lateral surface of the oedometer ring forming a plurality of channels to access the soil sample from outside. The plurality of needle probes, each configured to house a pore water pressure-measuring sensor, is detachably mountable to the plurality of channels from outside for simultaneously measuring the pore water pressures. The plurality of lateral pressure-measuring sensors is removably attachable to an inner peripheral side of the testing cell for measuring lateral pressures of the soil sample.

Abstract: A method for performing a 3D point cloud object detection is provided. The method includes: receiving an object data comprising a point cloud of a plurality of sensed points; performing a grid-based key-points extraction on raw data points of the point cloud, so as to obtain one or more key-points; performing a hierarchical point-wise convolution on the raw data points of the point cloud according to the key-points, so as to obtain a plurality of target point-wise features; performing a location-aware 3D RoI pooling operation according to the target point-wise features, so as to obtain pooled point-wise features and pooled 3D voxels corresponding to the pooled point-wise features; performing 3D convolution operations on the pooled 3D voxels, so as to obtain represent data points, wherein each of the represent data points includes a represent feature; and inputting the represent data points into multi-layer perceptrons to obtain final predictions.

Abstract: A multifunctional and modular geotechnical testing device for testing a soil sample is provided. The testing device includes a testing cell, a plurality of needle probes, and a plurality of lateral pressure-measuring sensors. The testing cell has an oedometer ring for accommodating the soil sample, with a plurality of holes located on and angularly distributed over an internal lateral surface of the oedometer ring forming a plurality of channels to access the soil sample from outside. The plurality of needle probes, each configured to house a pore water pressure-measuring sensor, is detachably mountable to the plurality of channels from outside for simultaneously measuring the pore water pressures. The plurality of lateral pressure-measuring sensors is removably attachable to an inner peripheral side of the testing cell for measuring lateral pressures of the soil sample.