DEVELOPMENT OF LOOSE STRATA GROUTING EXPERIMENT DEVICE

Grouting simulation test is an effective way for determining the grouting engineering parameters and revealing the impacts of various parameters on the grouting efficiency. Existing grouting simulation test devices are not integrated. Thus, they cannot simulate the whole grouting process and cannot represent the confining pressure boundary under the filling and compaction of the grouting body, and cannot detect and evaluate the grouting efficiency soundly. After analyzing the grouting technology and theory, an advanced grouting simulation test device is developed in this research for treating the loose strata. This new device is an integrated system and can completely simulate the whole processes under various grouting technique. The loosen strata is filled into the rigid disassemble high-pressure vessel for simulating multi-hole (row) grouting. Confining pressure environment that corresponding to the strata of different depth can be simulated by adjusting the pressure of the gasbag in the inner wall of the vessel. This new devise also provides controllable hydraulic head for water injection experiment and quality evaluation after grouting. Functional verification results demonstrate that this new device can simulate the whole field grouting process really. And, the relationship between grouting parameters (e.g.grouting pressure and grouting quantity) and the grouting efficiency (e.g.diffusion distance, physical properties, et al.) can also be measured during grouting simulation test. This new device makes a foundation for the research on grouting mechanism and the parameter design for field grouting operation.