岩石钻孔原位测试技术的应用与改进

APPLICATION AND IMPROVEMENT OF ROCK BOREHOLE IN-SITU TEST TECHNOLOGY

如何确定岩体工程力学特性是工程设计中的重要问题,也是长期困扰工程界的难题。由于原位测试技术可克服室内试验扰动性及尺寸效应等缺点,逐渐发展成为一种重要的岩体力学参数取值手段。钻孔剪切试验技术近年来被广泛应用于土体现场直剪试验中,但其在岩石工程中的应用较为少见。对所引进的岩石钻孔剪切仪进行工程现场岩体钻孔剪切试验应用尝试,得到有益的试验结果。针对岩石钻孔剪切仪在工程实际应用中所存在的问题及不足,对其进行改进与完善。在此基础上,研制开发新的岩石原位测试设备——钻孔剪切弹模原位测试系统,实现同步获取岩体力学及变形参数,为岩体钻孔高效利用以及岩体工程力学参数的确定提供新的途径。

The method to obtain the rock mass mechanical parameters is critically important in geotechnical engineering.Thus in-situ test technology is basically employed to overcome the defects of disturbance and size effect in laboratory tests when determining mechanical parameters of rock mass.Recently,the borehole shear test（BST） is used extensively in soil direct shear tests,but the application for rock mass is rarely reported.Since the rock borehole shear test（RBST） equipment was introduced by China Institute of Water Resources and Hydropower Research in 2009,some in-situ test results have been obtained in geotechnical engineering sites.To overcome defects of RBST in engineering application,the technology of in-situ borehole test is improved.And the rock borehole shear-compress test equipment has been developed.By the new test system,the mechanical and deformation parameters of rock mass can be obtained simultaneously,which will provide a new way for determining the rock mass mechanical parameters in geotechnical engineering.