强透水砂卵石复杂地层的高压旋摆喷灌浆处理技术

High-pressure rotary swing grouting treatment technology for strong permeable sandy gravel complex formation

通过对复杂地层的结构和各种防渗材料进行深入研究,选择合适的施工机具,改进工艺。在试验分析的基础上,根据不同的地层确定科学的施工控制参数,进一步对两层强透水带采取简单易行的深层充填堵漏工程措施,达到理想防渗效果。经对嘉陵江和白龙江流域砂卵(砾)石地层多个工程实例统计分析,其防渗系数K>1×10-4 cm/s,而复杂强透水地层经试验分析计算和抽水验证,K<5×10-5 cm/s。介绍了采用单排孔替代2双排或三排高喷孔在复杂地层中的施工过程控制措施和充填式堵漏工程处理措施,应用实例可供类似工程借鉴。

Through deeply researching the formation of complex structures and a variety of impermeable materials, the suitable construction equipment and improved technology are seleted. During the trial on the basis of the analysis, based on different strata to determine the construction of scientific control parameters; and further on the two-storey high-permeability zone to take a simple filling of deep plugging engineering measures to achieve the desired effect of anti-seepage. By statistically analyzing the sandy gravels from the basin of the Jialing River and Bailongjiang formation and several other engineering examples, their anti-seepage coefficients are about K 〉 1×10^-4 cm/s; and the complex high-permeability strata by calculating and pumping test analysis to verify, K 〈5×10^-5 cm/s. Finally, an alternative, 2-hole single-row or three rows of double-row nozzle at high complex formation in the construction process control measures and filling plugging measures is suggested to deal with the success of the project application; and it will be available for similar projects.