滑坡虹吸排水方法  

SIPHON DRAINAGE METHOD FOR LANDSLIDE PREVENTION

作　　者：尚岳全[1] 蔡岳良[1] 魏振磊 潘攀[1] 

机构地区：[1]浙江大学建筑工程学院,杭州310058

出　　处：《工程地质学报》2015年第4期706-711,共6页Journal of Engineering Geology

基　　金："十二五"国家科技支撑计划项目(2012BAK10B06);国家自然科学基金项目(41272336)资助

摘　　要：排水是治理滑坡的有效方法。虹吸具有免动力实现水体的跨越输送和流动过程由液位变化自动调整等特性,非常适合控制滑坡地下水位上升的需要。但最大虹吸扬程10m和间歇性排水可能产生虹吸管顶部空气积累,制约了滑坡虹吸排水方法的推广应用。利用向下倾斜钻孔进入坡体深部,保持地下水位控制点与孔口高差小于10m,就可实现滑坡深层地下水的降排要求。通过控制虹吸排水管的直径,使虹吸管内形成稳定弹状流就可以防止空气积累,从而实现虹吸过程的持续有效。薄缝模型的能量法推导,已经证明了虹吸管形成稳定弹状流的最大管径约为4mm,长期静置模型验证了4mm直径的PA管完全可以形成完整的弹状流。虹吸排水工程实例证明,选择4mm虹吸管,可以实现滑坡深层排水且在间歇性虹吸过程中自动恢复虹吸。Drainage is an effective method for landslide control. Siphon with free power can realize water transport and the flow process controlled by liquid level change. It is very suitable for the need of slope groundwater control.But the highest siphon head 10 m and intermittent drainage may produce siphon top air accumulation,which restricts the application of landslide drainage. Using declined drilling into the deep slope,and keeping the difference between the groundwater level control point height and the orifice height less than 10 m,can realize the landslide deep groundwater descending requirements. Controlling the siphon drainage pipe diameter,the siphon tube to form a stable slug flow can prevent air accumulation. So,it can realize the continuous siphon process. Based on a thin seam model,it has proved that the maximum diameter of the siphon to form stable slug flow is about 4mm by energy method derived. The long-term static model also verified that 4mm diameter PA tube can form a complete slug flow.Examples are given to demonstrate the drainage project selection 4mm siphon,which can realize the landslide deep drainage and automatic restoration of siphon in intermittent process.

关 键 词：滑坡 排水 虹吸 斜孔 4mm 直径虹吸管 

分 类 号：TU42[建筑科学—岩土工程]