Microscopic Mechanics of Debris Accumulation Body with Expansive Fine Grain and PFC Numerical Simulation
To study the influence mechanism of the excavation stability of the debris accumulation body by the expansive fine grain, it has used by Particle Flow Code, based on indoor test, the fine-grain expansive effect has divided into fine-grain intensity attenuation and volume expansion, and it has linear decreased down from the surface on the accumulation body. Based on the contrastive analysis between simulated result and traditional finite element, the Particle Flow Code is more accurate and true. The analysis result has suggested that when consider the expansive action, the damage model is changed into surface sliding from part slump, and the X-direction stress added 20kPa in the interior of the accumulation body, and the whole sliding force added 30% more or less. At present, the field excavation situation is consistent with the calculation result.
Chaohe Chen, Yong Huang and Guangfan Li
L. N. Zheng et al., "Microscopic Mechanics of Debris Accumulation Body with Expansive Fine Grain and PFC Numerical Simulation", Advanced Materials Research, Vols. 243-249, pp. 4188-4194, 2011