A sample mounting device for direct tensile test of rock mass is provided, which includes a first positioning stage, a second positioning stage, a first support piece, a second support piece, and a screw drive mechanism. The second positioning stage is arranged above the first positioning stage and capable of moving up and down, and cushion blocks for gluing with the rock mass are coaxially and detachably arranged at opposite ends of the first positioning stage and the second positioning stage, and a rock mass mounting area is formed between the two cushion blocks. A screw of the screw drive mechanism includes a first thread segment and a second thread segment with opposite thread directions. The first support piece is connected with the first thread segment through a nut seat, and the second support piece is connected with the second thread segment through a nut seat.

Described herein are examples of improved material (and/or universal) testing machines having a lower crossbeam that may be moved via a drive system of the material testing machine. In some examples, this may be accomplished via drive shafts with different threading in upper and lower portions, and/or independent drive systems for upper and lower crossbeams. The ability to dynamically adjust (e.g., raise) the lower crossbeam may allow an operator to interact with test samples at a more comfortable height, and reduce the need for an operator to repeatedly bend and/or kneel.

Provided are a visible transparent soil model test box with an adjustable surrounding rock pressure and a manufacturing method therefor. The visible transparent soil model test box includes pressure plates, force transferring plates, bolt assemblies and pressure boxes. The model box is assembled by the bolt assemblies, and then transparent soil is poured into the box. During the pouring of the transparent soil, the pressure boxes are buried inside the transparent soil and at inner sides of a left pressure plate, a right pressure plate and an upper pressure plate. After the transparent soil is consolidated, nuts are screwed to push the force transferring plates and the pressure plates by pressure gaskets to move inward to squeeze soil mass, and the pressure is controlled through readings of the pressure boxes, thus achieving automatic regulation of the surrounding rock pressure.