云冈石窟第3窟后室顶板加固治理与监测

Strengthening and monitoring of the back room roof at Cave 3 of Yungang Grottoes

云冈石窟第3窟是云冈石窟开凿规模最大的洞窟,在开凿过程中戛然而止。特殊的洞窟结构加上千年的自然风化催生了多种病害,其中后室顶板崩塌最为严重。为此,采用岩石测试、地质雷达和钻孔勘查等多种方法,查明了顶板岩石性质和破坏形式。在钢结构支护的前提下,利用环氧树脂裂隙注浆结合玻璃纤维锚杆牵拉的方法对顶板进行加固。对施工完成后121 d的裂隙、倾斜和应力监测数据进行分析,表明加固效果良好,具有广泛的借鉴意义。

Excavation of Cave 3,the largest-scale cave excavation of Yungang Grottoes,came to an abrupt end during the process.The special structure and natural weathering over thousands of years have resulted in a variety of diseases,among which collapse of the back room roof is the most serious.By means of rock testing,physical exploration and borehole exploration,the causes of roof failure were discovered.The roof has been strengthened by measures such as grouting of cracks and insertion of anchor rods subsequently.The analysis of cracks,tilt and stress monitoring data for 121 days after completion shows that the reinforcement is effective and it has extensive reference significance.