定向穿越工程对堤防安全影响评价

Safety analysis of the levee of directional drilling crossing project

利用导向钻进铺管技术进行穿河管道工程建设,对堤防安全的主要影响是管道施工对河流与堤基下地层产生扰动,该扰动带可能诱发渗透破坏。文章结合工程实例,利用地下水流数值模拟模型,模拟不利的水文、气象条件下地下水流场,计算流场中的最大水力坡度;根据穿越地层的允许水力坡度,依据临界水力坡度法,定量评价工程诱发渗透破坏的可能性。

Crossing river pipeline projects are carried out by the use of guided boring technology of pipelaying. The main impact to the levee is the stratum disturbance of rivers and dike in pipeline construction, and the seepage sabotage may be induced. Based on the actual engineering and using groundwater simulation mode, this paper simulates the groundwater flow and calculates the maximum hydraulic gradient, under the unfavorable weather and hydrological conditions. Then, according to the allowable groundwater flow gradient in the stratum, the possibility of seepage sabotage induced by engineering can be quantitatively analyzed based on the critical hydraulic gradient method.