岩土力学Issue(8)：2157-2162,6.
土质隧道支护方式对围岩稳定性影响的模型试验研究
Model test research on influence of earth tunnel support patterns on stability of surrounding rock
摘要
Abstract
Based on similarity theory, sand is used to simulate surrounding rock and iron wire is used to simulate rock bolt. The paper conducts actual measurement on the change rules of stress distribution, stability and regionalization of surrounding rock under different supporting forces of surrounding rock, different lengths of rock bolt and combined action of rock bolt and tunnel around supporting force during the excavation process of tunnels. Finite element modeling is used to simulate the stress distribution laws of surrounding rocks with different bolt lengths, and the range of surrounding rock plastic zone is acquired based on Drucker-Prager (D-P) yield criterion. The study shows that the carrying capacity of surrounding rock can be brought into full play through combined support of rock bolt and supporting force of surrounding rock. The supporting length of rock bolt should be no less than the external radius size of loose zone without any support. Under the condition of loose surrounding rock, the rock bolt length should be no less than one fifth of the tunnel span; and during comprehensive support process, the supporting force of surrounding rock should be about 5%of the vertical stress of primary rocks. By comparing the simulated results of the experiment and finite element modeling, the latter result is more conservative than the former one.关键词
模型试验/数值模拟/围岩应力/分区规律/综合支护Key words
model test/numerical simulation/stress of surrounding rock/distribution law/comprehensive support分类
建筑与水利引用本文复制引用
邢心魁,张坤鹏,闫茂龙,张坚,李迎..土质隧道支护方式对围岩稳定性影响的模型试验研究[J].岩土力学,2014,(8):2157-2162,6.基金项目
国家自然科学基金资助项目（No.51068004）；广西岩土力学与工程重点实验室基金资助项目（No.11-CX-03）。 （）
