【摘要】 济南是举世闻名的"泉城",地下水资源的保护对济南的经济社会发展具有十分重要意义。为了解决城市建设过程中,基坑降水引起的地下水资源的过度流失问题,在济南西郊开展地下水加压回灌试验,得出以下结论:①在济南西郊富水卵石层地质条件下,加压回灌对于回灌井工作效率的提高具有显著效果,从现场试验数据来看,当井口压力增加至0.07MPa时,各井回灌量均表现出相比常压状态下50%左右的增长量;②随着回灌井口压力增加,回灌影响范围相应扩大,井口压力达到0.05MPa时,回灌影响半径相比常压状态下增长达80%以上。虽然加压回灌对于增加回灌井工作效率具有显著效果,但应考虑回灌目的层以上土层的渗透风险和回灌井周密封措施的抗渗强度,须按最不利情况设定回灌井口压力上限值。试验表明,加压回灌适用于济南西郊强透水卵石层,回灌量大且效率高,能有效补偿由于基坑降水引起的地下水资源的流失,对于"护泉"具有重要意义。更多还原

【Abstract】 Ji’nan is the world famous "Spring City", the protection of groundwater resources is of great significance to its economic and social development. In order to solve the problem of excessive loss of groundwater resources caused by foundation pit dewatering in urban construction process, groundwater pressurized recharge experiment was carried out in the western suburbs of the city. The following conclusions are drawn: 1) Under the geological condition of the water rich oval layer in the western suburb of Ji’nan, pressurized recharge has a significant effect on improving the efficiency of the recharge well. From field test data, when the wellhead pressure increases to 0.07 MPa, the recharge volume of each well shows a growth rate of about 50%compared to normal pressure. 2) With the increase of the pressure of the recharge well, the influence range of recharge is enlarged, and when the wellhead pressure reaches 0.05 MPa, the influence radius of the recharge is increased by more than 80% compared with the normal pressure. Although pressurized recharge has significant effect on increasing the working efficiency of recharge wells, it is necessary to consider the seepage risk of the soil layer above the target level and the impervious strength of the sealing measures around the recharge well.The upper limit of recharge pressure at the wellhead must be set according to the most unfavorable condition. The test shows that the pressure recharge is suitable for the strong water permeable gravel layer in the western suburb of Ji’nan, which has great recharge and high efficiency. It can effectively compensate for the loss of groundwater resources caused by the dewatering of the foundation pit, which is of great significance to the "spring protection".更多还原