CAJ | 학술논문

衬砌背后空洞和衬砌开裂是威胁高速铁路隧道行车安全的最主要问题。高速铁路隧道衬砌背后空洞不仅是威胁隧道结构安全的重要因素，更是造成衬砌结构开裂最主要的原因。通过基于虚拟裂缝模型的扩展有限元方法( XFEM)和基于弥散裂缝模型的常规有限元分析方法( CFEM)的地层结构模型，对高速铁路隧道衬砌拱肩背后一定范围内空洞引起的衬砌开裂形态进行数值模拟分析，开裂形态表现为拱肩背后空洞近拱顶边缘的二次衬砌内侧开裂，同时初期支护环向贯通开裂。研究表明，扩展有限元法能较好地描述衬砌开裂的走向、长度等开裂形态以及扩展规律等，而ANSYS中的SOLID65单元能实现对衬砌背后空洞引起衬砌开裂范围的定性描述，两者之间相互补充和相互验证能较为准确地描述衬砌开裂的几何信息，进而有助于衬砌结构开裂应力场分析。
츤체배후공동화츤체개렬시위협고속철로수도행차안전적최주요문제。고속철로수도츤체배후공동불부시위협수도결구안전적중요인소，경시조성츤체결구개렬최주요적원인。통과기우허의렬봉모형적확전유한원방법( XFEM)화기우미산렬봉모형적상규유한원분석방법( CFEM)적지층결구모형，대고속철로수도츤체공견배후일정범위내공동인기적츤체개렬형태진행수치모의분석，개렬형태표현위공견배후공동근공정변연적이차츤체내측개렬，동시초기지호배향관통개렬。연구표명，확전유한원법능교호지묘술츤체개렬적주향、장도등개렬형태이급확전규률등，이ANSYS중적SOLID65단원능실현대츤체배후공동인기츤체개렬범위적정성묘술，량자지간상호보충화상호험증능교위준학지묘술츤체개렬적궤하신식，진이유조우츤체결구개렬응력장분석。
The lining cracks and cavity behind lining are two major potential threats to the safety of high-speed trains. The cavity behind lining is considered not only the principal factor of threatening to the safety of tunnel structure, bus also the main cause of lining cracks in the high-speed railway tunnel. Concerning the lining fracture morphology under the conditions of a range of cavities behind the lining shoulder in the high-speed railway tunnel, the paper conducts a contrastive analysis with two different numerical simulation methods based on the stratum structure model, focuses on their theories and results of calculation, which are the XFEM based on the fictitious crack model and the CFEM based on the smeared crack model. The modeling results show that the cracks inside the secondary lining occur in the longitudinal boundary of the cavities adjacent to the tunnel vault and two circumferential through cracks appear along the circular boundary of the cavities to the primary lining. It also turns out that the XFEM can better describe the lining fracture morphology, such as the strike, length and crack laws, while the SOLID65 unit of ANSYS can offer a qualitative description to the fracture area of lining caused by the cavity behind lining. The mutual authentication and complementation can be more accurate to describe the geometric information and propagation rules of lining cracks and help the stress field analysis of lining fracture.