裂隙动水注浆渗流压力与注浆堵水效果的相关分析

Correlation analysis of seepage pressure and water plugging effect during grouting into a fracture with flowing water

采用裂隙动水注浆设备结合正交试验设计进行了裂隙动水注浆模型试验,获得了渗流压力场与注浆效果和注浆工艺之间的相关关系。结果表明,裂隙动水注浆的渗流压力场包括单峰型、平台型、多峰型、阶梯型4种类型;出现平台型和多峰型渗流压力场时的注浆堵水效果好,而出现阶梯型渗流压力场时的注浆堵水效果差;为了获得好的注浆效果且节约浆液,在渗流压力场为单峰型时应该适量增加注浆量;而在渗流压力场为平台型或多峰型时应该适量减小注浆量;渗流压力场为阶梯型时应该调节浆液配比,缩短凝胶时间。研究结果对应用压力监测及时控制施工质量和调整注浆工艺有指导作用。

A series of experiments of chemical grouting into a fracture with flowing water are carried out by using fracture grouting equipment based on orthogonal test design.The correlation among water plugging effect,seepage pressure variation,and grouting technology is obtained by analyzing the test results.The results show that the seepage pressure curves of grouting into a fracture with flowing water can be divided into four types,including single peak type,platform type,multi-peak type and ladder type.The water plugging effect is good when the seepage pressure curves are platform type and multi-peak type.It is poor for water plugging when the seepage pressure is ladder-type.In order to improve the water plugging effect and save the grout,the grout amount should be increased while the seepage pressure is peak type;but it should be decreased while the seepage pressures are platform type and multi-peak type;and the volume ratio of grout should be regulated to short gel time while the seepage pressure is ladder-type.The results can improve the efficiency and technology of grouting based on seepage pressure monitoring.