What is point load test?
Point load testing is used to determine rock strength indexes in geotechnical practice. The point load test apparatus and procedure enables economical testing of core or lump rock samples in either a field or laboratory setting. These factors have been proposed by various researchers and are dependent upon rock type.
How is point load calculated?
A point load is an equivalent load applied to a single point, which you can determine by calculating the total load over the object’s surface or length and attributing the entire load to its center. Determine the total length or area to which a load is applied.
What is rock point load strength?
Point-load strength (Is) as a measure for the determination of rock strength and for estimating uniaxial (unconfined) compressive strength (UCS) are described and both put together and used for rock strength classification of brittle and hard rocks.
How do you measure the strength of a rock?
The tensile strength of rock is defined as the pulling force, required to rupture a rock sample, divided by the sample’s cross-sectional area. The tensile strength of rock is very small and is of the order of 0.1 times the compressive strength.
Is 50 converted to UCS?
With this new correction, they found the ratio of UCS to Is(50) to be approximately 29. The index-to-strength conversion factor (k) relating UCS to Is(50) was reported to depend on the compressive to tensile strength ratio, the Poisson’s ratio, the length and the diameter of the rock specimen.
Is code point load index?
The point load test is primarily an index test for strength classification of rock materials. The results of the test should be used to predict the uniaxial compressive strength of unweathered rock for the purpose of RockMass Classification.
What is maximum point load?
The point on a stress-strain diagram indicating where the tensile specimen experienced the greatest amount of tensile force.
What is two point load test?
Two-point loading test is conducted based on the British Standard BS 1881-118 (1983), method for determination of flexural strength. This method describes the determination of flexural strength of test specimens of hardened concrete by moment in the centre zone using two point loading (BSI, 1983).
What is rock porosity?
More specifically, porosity of a rock is a measure of its ability to hold a fluid. Mathematically, it is the open space in a rock divided by the total rock volume (solid and space). A rock may be extremely porous, but if the pores are not connected, it will have no permeability.
Is a 50 point load?
9.2. 2 The size-corrected point load strength index, Is(50), of a rock specimen is defined as the value of Is that would have been measured by a diametral test with D 5 50 mm.
What does point load mean?
Point load (P) is a force applied at a single infinitismal point at a set distance from the ends of the beam. Return to Calculator. Uniform Distributed Load (q) Uniform distributed load (q) is a force applied over an area, denoted by q which is force per unit length.