Analysis of Penetration Characteristics and Relationship Construction of Penetration Parameters for Landslide Monitoring Probe

To effectively carry out landslide monitoring, it is necessary to penetrate the probe into the sliding zone to monitor the in-situ multi-field information. However, the penetration causes in-situ soil disturbance, leading to the inaccurate measurement of multi-field information. Therefore, the theoretical method and coupled Euler-Lagrangian (CEL) large deformation FEA method are adopted to analyze the penetration process under different soil depth and different penetration parameters, and the change law of cone end resistance and lateral friction resistance are explored. The results show that: in the intrusion stage, the penetration resistance mainly comes from the cone end resistance, and the penetration resistance increases sharply and then slows down; The smaller the perseverance angle, the smaller the penetration resistance increment, and the less the force mutation; with the increase of the penetration speed, the penetration resistance increases, the lateral friction resistance / penetration resistance ratio and the contact area decrease; with the increase of the soil depth, the penetration resistance increases, and the lateral friction resistance / penetration resistance ratio increases. The theoretical results agree well with the simulations. Based on the simulation results, the relationship between the penetration resistance and perseverance angle, soil depth, penetration speed is established to provide reference for the design and selection of the probe structure. Finally, the prototype debugging was carried out to verify the simulation.