浅埋隧道段地表高压旋喷桩抗渗效果评价研究

选取桩间土透水率降低率、桩体透水率降低率、围岩孔隙水压力降低率作为评价指标，建立了基于熵权法的定量和定性效果评价模型，评价地表高压旋喷桩在隧道浅埋段的抗渗效果。通过某山岭隧道现场压水试验和围岩水压力监测得到评价指标实测值和熵权法分析的原始数据，完成了该隧道浅埋段地表抗压旋喷桩抗渗效果的评价，评价等级为“较好”；现场开挖揭露的情况与评价结果较为吻合，表明评价模型的可靠性。

Evaluation Research of Anti-penetration Effect of Surface High-pressure Rotary Get Grouting Pile in Shallow Buried Tunnel Sections

The reduction rate of soil permeability between piles, the reduction rate of pile permeability and the reduction rate of surrounding rock pore water pressure have been selected as evaluation indexes, and the quantitative and qualitative evaluation models based on entropy weight method have been established, and the anti-penetration effect of surface high-pressure jet grouting piles in the shallow buried section of tunnel has been evaluated. Based on the field water pressure test and surrounding rock water pressure monitoring of a mountain tunnel, the measured values of the evaluation indexes and the original data analyzed by entropy weight method have been obtained, and the anti-penetration effect of the surface pressure resistance rotary grouting pile in the shallow buried section of the tunnel has been evaluated. The anti-penetration effect score of the shallow buried section achieves to the "good" evaluation grade. The results of excavation on site are consistent with the evaluation results, which indicates the reliability of the evaluation model.