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Physical Test 8.0 Crack ##TOP## 🏴

Physical Test 8.0 Crack

the mechanical properties of underground rock mainly include mechanical strength and ductility. the strength of underground rock is usually determined based on the compression test. the collapse limit is the most direct measure of the mechanical strength of underground rock. however, the collapse limit is affected by the tensile deformation capacity of rock. therefore, the collapse limit does not accurately reflect the actual mechanical strength of the rock. for most types of underground rock, the fracture strength is the most direct measure of the mechanical strength of underground rock, and the fracture strength of underground rock is directly proportional to the compressive strength. the fracture strength of underground rock refers to the average load bearing capacity of rock when being subjected to large-scale deformation. the collapse limit is the most direct measure of the mechanical strength of the rock. therefore, the collapse limit is not suitable for the measurement of the mechanical strength of a rock mass which is in a stressed state. it is the most direct and sensitive measure of the fracture strength of the rock.

1. the collapse limit of the rock mass increases gradually with the loading. the compression load decreases gradually after the collapse of the rock mass. the fracture strength is the first load to break the rock mass. when the collapse limit is reached, the rock mass is fractured into two parts and the fracture strength can be calculated by the fracture load. 2. the initial collapse of the rock mass is accompanied by a certain amount of elastic deformation. the collapsed part of the rock mass is relatively soft. when the fracture load is applied, the rock mass is crushed and finally broken into two parts. 3. the fracture strength of the rock mass is calculated by the area between the loading curve and the load-fracture curve. the loading curve is the curve of rock mass stress under repeated loading. the load-fracture curve is the curve of fracture load under constant loading. the area between the two curves is the fracture strength of the rock mass. in order to improve the accuracy of the fracture strength, the fracture strength is commonly measured by the fracture load. the test method is as follows: step 1. a load is applied to the rock mass. when the collapse limit is reached, the fracture load is recorded. step 2. the fracture load is applied to the rock mass again. step 3. the above two fracture loads are added to calculate the fracture strength of the rock mass.