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利用二维真实破裂过程分析软件RFPA2D建立了在静载荷作用下含溶洞巷道围岩破坏过程的数值模型,分析了巷道拱顶、侧部及底部围岩中存在溶洞三种情况下巷道围岩的破裂过程,并与不含溶洞巷道的情况进行了对比。结果表明,巷道围岩中溶洞的存在,使得巷道围岩应力场和位移场的分布发生变化,在溶洞与巷道之间区域应力集中程度较大,破坏总是发生在巷道邻近溶洞一侧且与溶洞距离最近处。在相同加载条件下,三种情况中底部存在溶洞时围岩最先发生破裂,并迅速与溶洞贯通,使巷道底板破坏,底部溶洞对巷道的稳定性最为不利。在巷道周边存在的不同分布位置的溶洞,使得巷道围岩各部位的应力集中程度不同,靠近溶洞侧的围岩应力集中程度较大,围岩位移变化较大。
The numerical simulation model of surrounding rock of tunnel with cave under static load was established by using two-dimensional real rupture analysis software RFPA2D. The analysis of the surrounding rock of the tunnel under three kinds of cave with vault in the vault, side and bottom of the tunnel, The rupture process was compared with the case of cave-free tunnels. The results show that the existence of cave in the surrounding rock causes the distribution of stress field and displacement field in the surrounding rock of the roadway to change. There is a great concentration of stress in the area between the cave and the roadway. The damage always occurs on the side of the cave adjacent to the cave and Karst nearest distance. Under the same loading conditions, the surrounding rock was the first to rupture in the bottom of the three cases and quickly penetrated with the cave, causing the bottom of the roadway to be destroyed, and the stability of the bottom cave to the roadway was the most unfavorable. The existence of cave in different distribution around the roadway makes the concentration of stress in different parts of the surrounding rock of the roadway different. The stress concentration of the surrounding rock near the cave side is larger and the displacement of the surrounding rock changes greatly.