红层蠕变特性及隧道围岩位移PSO-SVM预测研究  

Creep Characteristics of Red Layer and Tunnel Surrounding Rock Displacement Prediction Based on PSO-SVM

作　　者：何延兵 刘辉[2] 

机构地区：[1]湖南省益娄高速公路建设开发有限公司,湖南益阳413000 [2]长沙理工大学岩土工程研究所,湖南长沙410076

出　　处：《公路工程》2016年第2期75-79,共5页Highway Engineering

基　　金：国家自然科学基金(51178064)

摘　　要：在红层地区修建隧道为保障其在服役期间的稳定性,需对红层的蠕变性进行研讨。采用改进的三轴蠕变试验仪进行蠕变试验,以获取红层软岩的蠕变参数。通过添加宾哈姆体修正西原体蠕变模型,可显著提高其拟合精度。基于西原体蠕变模型对隧道围岩位移解析式进行了推导以及采用蠕变程序求得隧道围岩长期变形值。通过工程实例分析,其计算结果与实测数据吻合度较高,表明了修正的西原蠕变模型接近实际情况。同时采用粒子群优化算法结合支持向量机的方法,构建预测围岩位移变化预测PSO-SVM模型,为考虑隧道围岩蠕变性下的稳定性分析及处治提供理论依据。The construction of the tunnel to ensure their stability during service in the red layer region,the need for creep red layer seminar. With improved triaxial creep test instrument for creep test,the creep parameters for red bed soft rock. Bingham amended by adding Nishihara creep model,for significantly improve the fitting accuracy. Nishihara creep model based on tunnel surrounding rock displacement analytic formula has been derived and the adoption of procedures to obtain tunnel surrounding the longterm creep deformation values. By engineering example analysis,the calculation results with the experimental data fit a higher degree,indicating Nishihara amended creep model close to the actual situation. While using particle swarm optimization and support vector machine method to construct forecasting surrounding rock displacement prediction PSO-SVM model for consideration and Treatment of tunnel surrounding rock stability analysis under creep provide a theoretical basis.

关 键 词：红层 蠕变性 改进蠕变试验仪 修正西原体模型 PSO-SVM预测模型 

分 类 号：U456.31[建筑科学—桥梁与隧道工程]