142 results about "Shear strength test" patented technology

The invention discloses a detection method for detecting the brickwork shear strength of a cement mortar concrete porous brick wall. According to the method, the brickwork shear strength is detected based on the core drilling method. The brickwork is directly drilled to obtain a core sample. Arc surface-shaped holes in the core sample of the porous brickwork are filled densely by adopting the quick-hardening material. Meanwhile, the end bearing surface of the core sample is leveled and blocked up. After that, the shear strength test on the brickwork is conducted along the straight-joint cross section of the core sample. The shear strength of the brickwork core sample is converted into the shear strength of the brickwork. According to the technical scheme of the invention, the detection result of the method directly reflects the shear strength value the straight-joint cross section of the brickwork, so that the shear strength of the brickwork can be accurately reflected. Therefore, the method provides a basis for design-checking and calculation or identification and reinforcement. Meanwhile, the result is accurate and reliable, and the damage to the original structure is reduced, wherein a damaged part can be easily repaired. The above technique completes the field detection technology of brickwork projects and has good social and economic benefits. The correlation index of a relation curve between the shear strength of the core sample and the shear strength of a brickwork standard component is relatively high, and the average relative error of the curve is 13.7%. The relative standard deviation of the curve is 19.7%.

The method for making and testing rock compressive shear samples with discontinuous joints at high temperature in the present invention includes: 1) making rock compressive shear samples with discontinuous joints; 2) using rock compressive shearing samples with discontinuous joints The sample is tested for shear strength: a) Use the rock high-temperature triaxial compression test equipment to directly load the sample, carry out the rock compression test with discontinuous joints, and measure the shear strength with discontinuous joints; b) Use the rock high temperature The triaxial compression test equipment conducts the joint shear test under high temperature and high pressure conditions in the temperature and pressure chamber and the acoustic emission AE and CT scanning research during the test process: C) The shear plane of the rock compression shear sample with continuous joints is 10℃~ Testing of shear strength indicators (cohesion and internal friction angle) at 200°C. The invention can carry out acoustic emission (AE) test during sample compression and CT scanning test in compression process, has the advantages of exploring the effect of temperature and pressure conditions on joint properties, and makes up for the deficiencies of traditional rock samples.

The invention relates to a pre-applied shearing strength test piece, a preparation device and a preparation method for a test piece and a splitting test method. The invention aims to overcome the defects that only a single-axial tensile pressing condition is considered and the shearing strength is difficult to consider on the basis of the traditional high pressure water splitting simulation test design method and traditional high pressure water splitting simulation test design device and the test piece only can be normal concrete. The test piece has an extending direction; an inclined layer is arranged on the middle position along the length direction of the extending direction; an included angle alpha is formed between the inclined layer and a preset direction; a preset crack is arranged on the inclined layer; the preset crack is communicated with the exterior of the test piece through an interface channel. According to the test method, the preset crack is filled with high pressure water till the preset crack is split and a single-shaft test device is used for applying the shearing strength to the test piece. The test piece, the device and the test method provided by the invention can consider the influence of the shearing strength of the roller compacted concrete, so that the working condition of the roller compacted layer of a roller compacted concrete high-dam under the effect of high pressure water can be effectively simulated.