地面防治水注浆系统结构优化及应用

Structure Optimization of Ground Control Water Grouting System and Application

在地面防治水超前注浆治理高承压水害注浆过程中,注浆泵三通堵塞维修时间间隔由6~9 d减小到3~4 d,严重时1~2 d出现堵塞问题,严重影响注浆连续性和质量。针对该问题,利用流体力学软件SolidWorks Flow Simulation对现有注浆泵吸浆口三通内部流场分布进行数值模拟仿真,分析其腔体内部流场状态。由于内部流体干涉致使部分颗粒动能损耗较大,固体颗粒流速小于不淤临界流速形成沉积型堵塞。根据堵塞原因进行结构改进优化,改善三通内部流体流场分布,提高腔体内部固体颗粒流速。改进后的吸浆口三通内部流体流场分布均匀,未出现干涉问题,且最低流速为0.58 m/s,是现有结构最低流速(0.072 m/s)的8倍,有效提高内部颗粒流速大于不淤临界流速,从机理上解决沉积问题。在注浆排量大于200 L/min时,未发生堵塞问题,有效解决了现场施工难题。

In the grouting process of advanced grouting treatment of high confined water damage with ground water prevention and control,the plugging maintenance time interval of the three channels of the grouting pump decreases from 6~9 days to 3~4 days,and the plugging problem occurs in 1~2 days when it is serious,which seriously affects the continuity and quality of the grouting.Aiming at this problem,the fluid mechanics software SolidWorks Flow Simulation was used to carry out numerical simulation on the internal flow field distribution of the suction nozzle of the existing grouting pump,and the internal flow field state of the cavity was analyzed.Due to the internal fluid interference,the kinetic energy loss of some particles is large.The flow velocity of solid particles is less than the critical flow velocity of non-silting and forms deposition blockage.According to the reason of blockage,the structure was improved and optimized to improve the fluid flow field distribution in the tee and increase the flow velocity of solid particles in the cavity.The fluid flow field in the improved suction nozzle three-way is evenly distributed without interference,and the minimum flow velocity is 0.58 m/s,which is 8 times of the minimum flow velocity(0.072 m/s)in the existing structure,which effectively increases the internal particle flow velocity to be greater than the non-silting critical flow velocity,and solves the deposition problem from the mechanism.When the grouting displacement is greater than 200 L/min,there is no blockage problem,which effectively solves the problems in field construction.