同进隧道二次衬砌开裂原因分析及治理

The Tongjin tunnel two lining cracking reason analysis and treatment

衬砌裂纹是隧道衬砌承受力超出其强度的反映,二次衬砌开裂是隧道工程常见的病害,针对同进隧道二次衬砌开裂段局部侵入净空进行了分析,围岩分级、地下水和施工因素是导致衬砌开裂的主要原因,对失效衬砌采取拆除重建进行整治,首先加固周围的围岩,加强对衬砌裂纹的监控量测,拆除旧衬砌时,及时进行初期支护,确保施工安全。提出了预防裂缝开裂的措施,设计方面正确判断围岩级别,选择支护和衬砌参数;施工方面规范操作,确保支护到位和衬砌强度,防患于未然。

Lining crack is a reflection of tunnel lining bearing force beyond its strength,the two lining cracking is the common tunnel disease,according to the Tongjin tunnel lining crack section two local incursion clearance,has carried on the analysis,classification of surrounding rock,groundwater and construction factors is the main reason leading to the lining cracking,take the demolition and reconstruction on the regulation failure lining first,strengthening the surrounding rock,to strengthen the monitoring of lining crack volume measurement,the removal of old lining,timely initial support,to ensure the construction safety.Put forward to prevent cracking measures,design a correct judgment of the rock level,the choice of support and lining parameters;construction standardized operation,to ensure the support in place and the strength of lining,nip in the bud.