三维模型试验新技术及其在大型地下洞群研究中的应用

介绍了三维地质力学模型试验中的几项新技术，包括高容重模型材料NIOS的采用、三维复杂地应力场的生成和监控技术、洞室群施工过程模拟中的隐蔽开挖技术和内窥监测等等。根据国内外文献查对，这几项技术在岩石力学及地下工程试验研究中尚未见报道。目前，这些新技术已成功用于某超大型水电站地下厂房洞室群的施工仿真三维地质力学模型试验研究，取得了满意的成果，并对设计方案起到有力的支持和验证作用。本项试验的成功，开辟了地下洞室工程三维试验研究的一条新途径，其成果可以应用于我国其他超大型地下洞室群工程的布置、设计和研究。

DEVELOPMENT AND APPLICATION OF NEW TECHNOLOGY FOR 3D GEO-MECHANICS MODEL TEST OF LARGE UNDERGROUND HOUSES

Several newly developed techniques and methods for 3 dimensional geo-mechanics model test are introduced,such as new model material NIOS with high density and low cost,so-called discretized finite principal stress surface loading and monitoring system for the generation of the modeled initial stress field of the test,the special technique and apparatuses for modeling the excavation of houses located deep inside the model material,inner peep technology and so on. By adopting those new techniques and methods mentioned above,a very large 3D model test with high comparability for a newly designed underground powerhouse has been fulfilled. The excavation sequence and the supporting reinforcements were also modeled in the test. The model test was successful and the results were fairly satisfactory. Those techniques and methods can be used for other large geo-mechanics model test.