381 results about "Direct shear test" patented technology

The invention discloses a rock and earth mass in-situ direct shear test device with an automatic data acquisition system and a rock and earth mass in-situ direct shear test method and relates to a rock mechanical test technology. A rock and earth mass test sample can be subjected to shear failure on a proposed shear surface by applying a normal load and a horizontal shear force to the test sample, and the automatic data acquisition system is used for recording relevant data such as shear stress and displacement in a test process. The test device comprises the test sample (00), a shear box (10), a reaction system (20), a perpendicular pressure system (30), a force transmission system (40), a tangent pressure system (50), a roller row (60) and an automatic data acquisition system (70). By adopting strain control, the rock and earth mass in-situ direct shear test device is high in measurement precision and high in stability; the rock and earth mass in-situ direct shear test device is provided with the automatic data acquisition system; a spoke sensor is used through stress control, so that stress can be precisely measured; all components can be detached, so that the rock and earth mass in-situ direct shear test device is convenient to transport and mount.

The invention relates to a manufacturing mold of a structural surface model in a direct shear test, which comprises an upper disk mold, a lower disk mold and a positioning pin, wherein the upper disk mold is positioned on the lower disk mold; the positioning pin for centering the upper disk mold and the lower disk mold is arranged on the bottom surface of a side plate of the upper disk mold; the upper disk mold comprises an upper front side plate, an upper left side plate, an upper back side plate and an upper right side plate; the cavity shape formed by the upper disk mold is matched with the structural surface model of the upper disk to be manufactured; the upper front side plate is fixedly connected with the upper left side plate and the upper right side plate, and the upper back side plate is fixedly connected with the upper left side plate and the upper right side plate; the lower disk mold comprises a lower front side plate, a lower left side plate, a lower back side plate and a lower right side plate; the cavity shape formed by the lower disk mold is matched with the structural surface model of the lower disk to be manufactured; and the lower front side plate is fixedly connected with the lower left side plate and the lower right side plate, and the lower back side plate is fixedly connected with the lower left side plate and the lower right side plate. The manufacturing mold of the invention not only has the advantages of convenient operation, high speed and high accuracy but also can be used for manufacturing multi-scale structural surfaces of which the upper disks and the lower disks are completely matched.