大型地下洞室群相邻块体地震响应

为了更好地模拟地下洞室中存在的相邻块体结构在地震荷载作用下的运动与动态响应特性,建立了一种考虑块体间黏结强度影响的地下洞室相邻块体动力抗滑模型,并通过数值模型分析了该抗滑模型的有效性与优越性。在工程实例分析中,采用经典抗滑模型时Ⅰ类相邻块体中两块体水平X向位移在整个地震阶段的均方根值分别为2.16 cm和2.02 cm,采用修正抗滑模型时两块体对应响应值分别为2.00 cm和1.94 cm;Ⅱ类相邻块体中两块体在经典抗滑模型与修正抗滑模型条件下的对应响应值分别为3.68cm和3.65cm与3.55cm和3.54cm,上述结果反映了相邻块体在黏结特性的作用下具有更好的稳定性,说明该模型具有较好的工程适用性与应用价值。

Seismic responses of adjacent blocks in large-scale underground cavern group

In order to simulate the movement and dynamic response of adjacent blocks in an underground cavern group under seismic loads, a dynamic anti-sliding model, considering the bond strength between the blocks, was established. The effectiveness of the anti-sliding model in comparison to other models was analyzed using a numerical model. In the practical engineering examples, the calculated root mean square values of horizontal displacement in the X direction of two adjacent blocks of type I were 2. 16 cm and 2. 02 cm when the classical anti-sliding model was used, and 2. 00 cm and 1. 94 cm when the modified anti-sliding model was used throughout the earthquake process. The corresponding simulated results of two adjacent blocks of type II were 3. 68 cm and 3. 65 cm when the classical model was used and 3. 55 cm and 3. 54 cm when the modified model was used. Hence, it is demonstrated that adjacent blocks considering bonding characteristics show much better stability, and the proposed model has high application value.