Under-hole in-situ three-dimensional static load-vertical side friction force testing device for rock and earth mass

Abstract

The invention provides an under-hole in-situ three-dimensional static load-vertical side friction force testing device for a rock and earth mass. The device comprises a lateral experiment part, a vertical experiment part and a testing unit, wherein the lateral experiment part comprises a fixed pipe fixed to the axis of a rack, multiple arc-shaped counter-force plates which can be radially and movably installed on the circumference of the fixed pipe, a radial power device for driving the counter-force plates to perform radial movement, a sliding device fixed to the fixed pipe to install the radial power device and a sliding power device driving the radial power device to move on the sliding device. The vertical experiment part comprises a vertical power device and a vertical static load device exerting pressure to the bottom of a hole. The testing unit obtains measurement data of the lateral experiment part and the vertical experiment part through measurement elements and transmits the data to a data mainframe located on the ground. The under-hole in-situ three-dimensional static load-vertical side friction force testing device can perform experiments under holes under the conditions of any depth, various rock and earth masses and various water contents and obtain various strength indexes of the rock and earth masses and fully meets the index requirements of field experiments.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a testing device capable of simultaneously realizing in-situ three-dimensional static load and vertical side friction resistance under a rock-soil body hole. Background technique [0002] Compared with the traditional method of indoor test strength parameters, the in-situ test strength parameters of rock and soil have obvious advantages: [0003] 1) It is possible to carry out in-situ testing of the rock and soil body under the hole in the proposed site without sampling, which avoids a series of problems caused by the disturbance of the sampling, such as the disturbance of the original rock and soil sample and the change of water content; [0004] 2) The size of the rock and soil involved in the in-situ test can be larger in the classroom experiment, so it can better reflect the influence of the macroscopic structure of the rock and soil on the mechanical properties of the r...

AI Technical Summary

Problems solved by technology

Disadvantages of static penetration testing: 1) The penetration mechanism is not clear, and the friction resistance and tip resistance of the probe are not clear. At present, there is no clear mathematical model to describe it. When applied to the design of pile foundations, the side friction resistance and tip resistance can only be determined empirically. 2) It is difficult to penetrate gravel soil and dense sandy soil, and the soil layer cannot be directly observed

[0016] At present, the biggest problem in in-situ testing of rock mass is the lack of easy-to-use measuring equipment with accurate measurement results, especially fully automated intelligent equipment

Images