Study On Dynamic Response Characteristics Of Deep Vertical Wall Vaulted Underground Chambers Under Blasting Vibration

ABSTRACT:As water sealed oil tank, underground chambers generally have following characteristics:amount of neighboring chambers and complex structural arrangement. With the rapid development of engineering and technical, drilling and blasting technology have been widely used in underground chambers excavation and construction, because advantages of highly efficient and cheap. However, if blasting process designed is not appropriate, then the released huge energy from explosion will cause rock loose and instability, expansion of existing fissures, generation of new fissures, increasing of water permeability, rock burst and a series of problems which crises engineering safety. These problems will affect the normal use of water sealed underground oil tank; even cause serious casualties and significant economic losses. Therefore, it is very important to research the influence of blasting vibration on water sealed underground oil tank.This paper studies the effect of blasting vibration on propagation characteristics of rock peak velocity, which on crown location of construction tunnel#1, along the longitudinal roadway through monitoring tests. The spectral characteristics of rock peak velocity which on arch location. Use of ANSYS/LS-DYNA dynamic finite element software, simulate the dynamic response of deep vertical wall arched construction roadway#1under blasting vibration. Problems be analyzed include time feature and frequency spectrum characteristics of rock peak velocity at typical dot, relationship between peak velocity and explosive center distance when the amount of explosives Q=64.80kg, the attenuation law of peak velocity on different positions in different directions along the longitudinal roadway, the distribution of rock peak velocity on different positions in different directions on roadway cross-section, the influence of construction area size on rock peak velocity. Through ANSYS/LS-DYNA analysis impact of blasting excavation to neighboring deep vertical wall vaulted chamber rock when the amount of explosives Q=64.80kg. Also include time feature and frequency spectrum characteristics of rock peak velocity on neighboring chamber, the distribution of neighboring chamber rock peak velocity on different positions in different directions along the longitudinal roadway, the distribution of rock peak velocity on neighboring chamber in the cross section where the explosion source exist, relationship between rock peak velocity and clear spacing from neighboring chamber when the amount of explosives Q=64.80kg, the minimum clear spacing from neighboring chamber according to "Blasting Safety Regulations"(GB6722-2003), the impact of presence of neighboring chambers on deep rock peak velocity where the construction surface exist.