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通过对某高速公路深埋隧道主、横洞交叉段开洞侧主洞衬砌裂缝的现场检测及性状分析,研究对比了可能引起衬砌开裂的各种因素,得出了开裂的主要原因,认为隧道交叉段地层工程地质情况复杂,构造应力在应力场构成中占有很大比例,水平应力要比竖向应力大,且在横洞开挖后,主洞开洞侧截面承载能力一定程度上有所削弱,衬砌受力不均匀,出现应力集中现象,从而导致混凝土开裂;基于现场地质参数及裂缝成因初步分析,利用有限元分析软件对衬砌开裂段的应力场及位移场进行了模拟,模拟结果验证了现场成因分析所得结论的正确性;基于现场裂缝实际情况,提出了详细的裂缝处治措施,可为今后解决类似隧道衬砌开裂问题提供参考。
Through the on-site inspection and character analysis of the lining cracks of the main tunnel in the cross section of the main tunnel and the transverse tunnel in a deep tunnel of a highway, various factors that may cause the cracking of the lining are compared and the main reason for cracking is obtained. The geological conditions of the cross-section strata are complex. The tectonic stress occupies a large proportion of the stress field and the horizontal stress is larger than the vertical stress. After the horizontal hole excavation, the bearing capacity of the cross-section of the main tunnel is weakened to a certain extent, The stress of the lining is not uniform and the stress concentration phenomenon occurs, which leads to cracking of the concrete. Based on the on-site geological parameters and preliminary analysis of the cause of cracks, the stress field and displacement field of the cracked lining are simulated by finite element analysis software. Analysis of the causes of the conclusions of the correctness; based on the actual situation of cracks on the site, put forward a detailed crack treatment measures for future similar tunnel lining cracking problems provide a reference.