1. School of Mechanics & Civil Engineering,China University of Mining & Technology(Beijing),Beijing　 100083,China; 2. State Key Laboratory for Geome-chanics and Deep Underground Engineering,Beijing　 100083,China

为进一步完善地下工程领域模型试验研究手段存在的不足,自主研发了一套新型地质力学模型实验系统,并以某矿煤巷掘进期间围岩变形演化特征研究为依托,通过试验结果与现场实测结果对比,验证了试验系统的可行性与可靠性。采用280个液压作动器实现了多方向主动稳定加载,能够还原地下工程围岩真实应力场分布特征;扩大了有效加载区域,较为显著地降低了尺寸效应与边界条件因素对试验结果精度的影响程度;首次综合采用了EDC伺服液压控制系统、光电编码器及数据实时传输系统,实现了数据实时采集,提高了数据采集准确度。试验结果表明:巷道开挖与支护过程中,模型巷道围岩变形规律与现场实测基本吻合,围岩变形主要特征基本一致,验证了该系统能够较好体现原型巷道围岩动态演化特征,具有一定工程应用价值,为地下工程围岩稳定性研究提供了良好途径。

In order to further improve the deficiencies of the model test in the field of underground engineering,a new set of experimental system of the geomechanical model was developed independently. To verify the feasibility and sta- bility of the new-built system,a large-scale similar model test was carried out based on the study of the deformation characteristics of surrounding rock during the excavation of a coal mine roadway. The performance was verified by com- paring the test results with the field test results. The innovations are as follows:① 280 hydraulic actuators are used to realize active and steady loading in various directions,which can restore the distributional characteristics of the in-situ stress field in the surrounding rock. ② Expanding the effective loading area significantly reduces the effect of size effect and boundary conditions on the accuracy of the test results. ③ For the first time,EDC servo hydraulic control system,photoelectric encoder and real-time data transmission system are adopted to realize real-time data acquisition and improve accuracy. The test results show that during the excavation and support of roadway,the deformation law of surrounding rock of model roadway basically agrees with the field measurement,and the main characteristics of sur- rounding rock deformation are basically the same. The system is verified to be able to better reflect the dynamic evolution characteristics of the surrounding rock of the prototype roadway and has certain engineering application value. It provides a good way to study the stability of surrounding rock in underground engineering.

YANG Renshu,ZHANG Yufei,WANG Zixu,et al. A newly-built geomechanical model test system and its application[J]. Journal of China Coal Society,2018,43(2):398-404.