喷锚支护措施对地下厂房洞室群整体稳定性影响

喷锚支护措施由于其诸多的优点,在地下工程中得到了广泛的应用。以隐式杆单元模拟锚杆,以壳单元模拟混凝土喷层,采用3维非线性有限元技术,分析冗各水电站地下厂房工程中喷锚支护措施的作用。通过计算得到了喷锚支护措施对围岩应力变形及塑性区的影响;利用强度折减法对地下厂房洞室群的整体稳定性进行计算分析,得到无支护措施情况和喷锚支护时洞室整体稳定性,从而评价支护措施对洞室群整体稳定性的影响。通过3维弹塑性有限元计算分析得到:喷锚支护措施可以有效地限制围岩的变形和塑性区的发展,可以在一定程度上改善围岩应力状态,避免应力集中,使洞室群整体稳定安全系数由1.8提高为2.5,有效提高了地下洞室的整体稳定性。

The affect of bolting support to the overall stability of the cavern group of underground power-house

Bolting support is widely used in the underground engineering due to its many advantages. In this paper, implicit bar elements and shell elements are used to simulate rockbolts and shotcrete layer respectively, the three-dimensional nonlinear finite element technique has been used to analyze the effect of bolting support in Rong-Ge underground powerhouse engineering. The influence of bolting support on the stress,deformation as well as plastic zones of surrounding rock have been recognized through calculation. The overall stability factor of Rong-Ge underground powerhouse is obtained by using the strength reduction method and the effect of bolting support on the overall stability can be recognized. The bolting support can effectively limit the development of deformation and the plastic zone of the surrounding rock, improve the stress state of surrounding rock, and avoid stress concentration in a certain extent, as well as make the stability safety coefficient raised from 1.8 to 2.5, improve the overall stability of underground powerhouse effectively.