岩土工程学报2017，Vol.39Issue(1)：89-98,10.DOI:10.11779/CJGE201701007
空洞对盾构隧道结构受力与破坏影响模型试验研究
Model testson influences ofcavity defectson mechanical characteristics and failure laws of segment liningsof shield tunnels
摘要
Abstract
By using the methodof model tests and introducing the progressivefailure theory into the analysis of disease occurrence and propagation ofsegment linings of shield tunnels, from the internal force, structural displacement, acoustic emissionsignals and processof crack occurrence and extension, a comparative studyonthe influences ofcavities behind linings underextreme loading conditionsis carried out. The results show that the existence of the cavities has significant influenceson theultimate bearing capacity and failurelaws ofshield tunnels.First,it decreasesthe corresponding loadat the critical point.Meanwhile theration of themaximum displacementtothe tunnel radius under this load alsodecreases. Secondly, theload of starting to inducemacroscopic crack is lowered. For different cavity locations, the cavitieslocated at spandrel are more likely to result in instability of the structure than those at hance and vault. The cavities may also changethe starting location of instability of thestructure, leading tothattheposition of instability is near or in the cavities directly.关键词
盾构隧道/模型试验/空洞缺陷/渐进性破坏/声发射Key words
shield tunnel/model test/cavity defect/progressivefailure/acoustic emission分类
建筑与水利引用本文复制引用
王士民,于清洋,彭博,申兴柱..空洞对盾构隧道结构受力与破坏影响模型试验研究[J].岩土工程学报,2017,39(1):89-98,10.基金项目
国家自然科学基金面上项目（51278424）；中央高校基本科研业务费专项资金项目（2682014CX070）；国家自然科学基金青年基金项目 （）
