摘要
根据已有施工案例调研,管片环面接触不平整时,易出现裂缝和渗漏水,进而导致承载力和耐久性降低。为了解管片的抗裂性能,通过设置垫块模拟管片的环面不平整度,进行传统钢筋笼无纤维管片、新型钢筋笼无纤维管片和新型钢筋笼有纤维管片在盾构推力作用下的加载试验。试验的主要结论如下:传统钢筋笼管片的裂缝发展快,数量多,宽度宽;新型钢筋笼管片分布有均匀的面筋,可抑制裂缝的发展,具有较好的抗裂性能;掺纤维管片裂缝弥散,单条裂缝长度短,初裂荷载提升明显,较未添加纤维管片具有更好的抗裂性。
Based on existing construction case studies,when the contact surface of the segment ring is uneven,it is prone to cracking and water leakage,which in turn leads to a reduction in bearing capacity and durability.To understand the crack resistance of the segments,spacers were used to simulate the unevenness of the segment ring surface,and loading tests were conducted on traditional rebar cage segments without fibers,new rebar cage segments without fibers,and new rebar cage segments with fibers under the thrust of the shield machine.The main conclusions of the tests are as follows:Traditional rebar cage segments exhibit rapid crack development,a high number of cracks,and wide widths;new rebar cage segments have uniformly distributed reinforcement on surface,which can suppress crack development and demonstrate better crack resistance;fiber-reinforced segments show dispersed cracking,shorter lengths of individual cracks,and a significant increase in initial cracking load,exhibiting better crack resistance compared to segments without fibers.
作者
朱海良
ZHU Hailiang(Shanghai Tunnel Engineering Co.,Ltd.,Shanghai 200032)
出处
《现代隧道技术》
CSCD
北大核心
2024年第S01期694-701,共8页
Modern Tunnelling Technology
关键词
盾构隧道
管片
抗裂性能
试验研究
Sheild tunnel
Segment
Crack resistance
Experimental study
