浅埋偏压隧道地表预注浆加固力学行为研究

Study on Mechanical Behavior of Pre-grouting Reinforcement of Shallow Buried Bias Tunnel

为研究采用不同的注浆强度时,对隧道开挖过程中围岩的竖向位移、净空收敛以及初期衬砌力学性能及其在实施作业过程的力学行为的影响,根据实验数据采取插值法选取了七组数据,并运用FLAC3D软件进行数值模拟分析.综合分析表明,隧道围岩的竖向位移、净空收敛以及衬砌受到的最大弯矩等,都随着注浆强度的增强而得到不同程度的改善.但是注浆体的体积强度增加到1.0 GPa左右时,即原状土体积模量的5倍左右时,继续增大注浆强度,效果并不明显.

Seven groups of experimental data were selected,and FLAC3D software was used for numerical simulation analysis.The results show that the vertical displacement of surrounding rock,the convergence of clearance and the maximum bending moment of lining during tunnel excavation are improved in different degrees with the increase of grouting strength.However,when the volume strength of grouting body increases to about 1.0 GPa,that is,when the volume modulus of undisturbed soil is about 5 times,the effect is not obvious.