A particle system has a complex force chain network

and its balance and stability depend on the geometrical structure and mechanical properties of the internal force-chain framework. To depict the micro-mesoscopic mechanical behavior of the particle system

we start with specifying the local arrangement morphology of particles

the contact force between particles and the physical parameters of particles and external load

and then conduct the deformation tests on the particle system subjected to a concentrated force based on the two dimensional-digital image correlation (2D-DIC). With combining with the DIC test method

the Newtonian mechanics theory and the particle linear momentum balance are used to obtain the contact force and the direction of contact force between the particles

and then determine the kinetics of the force chain. Once the distribution and variation of contact force between the particles are obtained

the force chain is demonstrated. It is suggested that there are two states in particle system

namely

the transverse force transmission state and the longitudinal force transmission state. The parameters such as the angle ? between the normal of the contact surface of particles and the horizontal axis

the force transmission angle ? are analyzed. The influences of ? and ? on the force chain damage are discussed. The parameters

the ratio R of the particle diameter d to the external load diameter D and the maximum number N of particles contacted with the loading rod

are analyzed. All of the above can provide a guideline for describing the evolution

destruction and reconstruction mechanism of the force chain.