%0 Journal Article
%T 直墙拱形砂岩隧洞破坏特征及破坏前兆研究<br>Study on Failure Characteristics and Failure Precursor of Arch Sandstone Tunnel with Straight Wall
%A 朝文文
%A 高剑
%A 郭得福
%J Mine Engineering
%P 246-253
%@ 2329-731X
%D 2023
%I Hans Publishing
%R 10.12677/ME.2023.112031
%X 为研究地下洞库岩体的破坏特征，开展含孔洞真实砂岩模型双轴压缩试验，同时结合声发射系统从岩石内部分析裂纹的演化过程及破坏前兆信息。试验结果表明，洞口拱脚处由于应力集中最先出现裂纹，裂纹沿着尖端向拱肩发展。洞室内部出现板裂现象，两侧直墙岩体受裂纹切割掉落至拱底。加载前期声发射信号微弱，随着裂纹的萌生及扩展，声发射活动逐渐变得活跃。即将到达隧洞峰值荷载时，声发射信号突然下降进入平静期，达到峰值荷载时声发射特征参数跃升均达到最大值，声发射平静期能够作为岩体破坏的预兆信息。<br />
In order to study the failure characteristics of underground cavern rock mass, the biaxial com-pression test of real sandstone model with holes was carried out, and the evolution process of crack and failure precursor information was analyzed from inside the rock with acoustic emission system. The test results show that the crack appears first at the arch foot of the opening due to stress concentration, and the crack develops along the tip to the spandrel. Slab cracking occurs in the cave, and the rock mass on both sides of the straight wall is cut by cracks and falls to the bottom of the arch. At the early stage of loading, the AE signal is weak, and the AE activity becomes active gradually with the initiation and propagation of cracks. When the tunnel is about to reach the peak load, the AE signal suddenly drops into the quiet period, and the AE characteristic parameters jump to the maximum value when the peak load is reached. The quiet period of AE can be used as the precursor information of rock mass failure.
%K 直墙拱形，砂岩隧洞，裂纹扩展，双轴压缩试验，破坏征兆<br>Sandstone Tunnel
%K Straight Wall Arch
%K Crack Propagation
%K Biaxial Compression Test
%K Sign of Destruction
%U http://www.hanspub.org/journal/PaperInformation.aspx?PaperID=64244