高标准免管护新型淤地坝坝身过流安全性研究

Study on Overflow Safety of a New Type of Warping Dam with High Standard and Free Management

高标准免管护淤地坝可避免传统淤地坝存在的洪水漫顶溃坝风险高、管护压力大、拦沙不充分等问题。为了给高标准免管护新型淤地坝技术的优化改进和推广应用提供理论依据,基于高标准免管护淤地坝原型漫顶过流冲刷试验,采用ABAQUS有限元软件和地质雷达探测技术,对其结构应力、变形及滑移脱空情况进行分析,结果表明:高标准免管护淤地坝在洪水漫顶、坝身过流情况下,坝体产生的增量位移较小,对坝体的稳定性、安全性不会产生大的影响;泄流结构(溢洪道)不会产生超过黄土固化新材料强度的拉、压应力,结构强度满足泄流要求;泄流结构和大坝之间不会产生大的相对滑移和脱空,结构稳定可靠。

High⁃standard and free management new warping dam can avoid the existing problems of traditional warping dam such as high risk of collapse,high pressure of management and maintenance,and insufficient sand containment.In order to provide a theoretical basis for the optimization,improvement and popularization of the high⁃standard and free management new warping dam,based on the overtopping and o⁃verflowing scouring test,the ABAQUS finite element software and geological radar detection technology were used to analyze the structural stress,deformation and slip cavitation.The results show that the increment displacement of the dam body is small under the condition of the flood overflows,and the stability and safety of the dam body will not be greatly affected.The discharge structure(spillway)will not produce tensile and compressive stress exceeding the strength of loess solidification new materials,and the structural strength can meet the discharge requirements.There is no large relative slip or cavitation between the discharge structure and the dam,and the structure is stable and relia⁃ble.