地铁隧道钻爆法施工影响下混凝土结构损伤预测方法研究

结合青岛地铁隧道下穿建筑物的工程实践，通过数值模拟的方法，分析了爆破振动影响下混凝土结构的应力分布，基于Ottosen和过-王2种混凝土破坏准则，推导了适用于混凝土材料的屈服接近度模型，进而得出了混凝土结构的损伤分布范围和演化过程。以地表沉降实测数据为基础，利用随机介质理论方法反分析地表移动参数，并利用所得的参数对下穿建筑物时进行了沉降预测，由此实现了对不同沉降量和爆破振速共同影响下建筑结构开裂损伤的量化评估与控制研究。结果表明：在建筑结构的开裂损伤演化中，地表沉降的影响程度远大于爆破振动的影响程度。

STUDY ON DAMAGE PREDICTION METHOD OF CONCRETE STRUCTURE DUE TO TUNNEL BLASTING EXCAVATION

Based on the practice of Qingdao subway tunnel under-passing building，get the concrete structure stress distribution under the influence of blasting vibration through the finite element calculation. Take the derivation of yield approach index model that suitable for concrete material based on the two kinds of concrete failure criteria. And then get the concrete structure damage distribution and evolution process combined with yield approach index function of Ottosen and GUO-WANG failure criterion. The fundamental ground moving parameters are obtained by using inverse analysis method based on ground surface measurement data of prophase excavation. Thus realize the quantitative evaluation and control of building structure damage under the influence of different settlement and vibration quantity. As a whole, settlement impact is much greater than the blasting vibration for damage evolution in building structures.