改进钻孔注浆法在有水流溶洞处理中的应用研究

Research on Improvement of Borehole Grouting Method in Treatment of Water Karst Caves

当工程中遇到有水流的地下溶洞时,常规钻孔注浆法是使用普通混凝土作为注浆材料和在溶洞底部设置专用排水通道,使其施工完成后水流能正常通过该段。改进钻孔注浆法是利用高渗透性混凝土代替普通混凝土的方法,不再使用排水通道。运用FLAC3D作为计算工具进行数值模拟,将改进方法与传统方法进行对比。对于高渗透性混凝土作为注浆材料时,采用流固耦合计算方法;普通混凝土采用固体力学计算模型。对比两者计算后的结果,发现改进方法更加安全可靠,证明了高透水性混凝土用在溶洞处理中是可行的。

When there are underground karst caves with flows in the project,the conventional borehole grouting method is to use ordinary concrete as the grouting material and to set up special drainage channels at the bottom of the karst cave so that after the completion of the construction,the water flow can pass through this section. The improvement of the borehole grouting method is to use high permeable concrete instead of common concrete,and the drainage channel is abandoned. FLAC3 D is used as a numerical tool for numerical simulation,by comparing traditional methods with the improved method. The fluid solid coupling method is used to calculate when using the high permeability concrete as a grouting material and solid mechanics calculation model for general concrete. After comparing the results,it is found that the improved method is safer and more reliable. The high permeable concrete is proved to be feasible in the treatment of karst cave.