独特心墙形式土石坝工程除险加固效能评价分析研究

Evaluation and analysis of danger removal and reinforcement efficiency of earth-rock dam with unique core wall structure

为探究黏土心墙和混凝土心墙组合形式下独特心墙结构的土石坝工程服役特性,笔者基于其初始条件、边界条件等重要因素,结合其渗流计算方法,借助APDL语言,二次开发了独特心墙结构土石坝工程渗流分析程序,给出了其浸润线的构建方法和渗流分析的理论计算方法,对加固前后渗流场进行了模拟分析,对比了大坝加固前后正常蓄水位下渗流场的总水头和压力水头,并求解对比了正常蓄水位下混凝土防渗墙内最大渗透比降、下游坝壳料最大渗透比降、总渗漏流量等数值,对其加固效能进行了定性与定量化的全面有效评价分析。

In order to explore the service characteristics of earth-rock dam with unique core wall structure under the combination of clay core wall and concrete core wall,based on its initial conditions,boundary conditions and other important factors,combined with its seepage calculation method,and with the help of APDL language,the seepage analysis program of earth-rock dam with unique core structure is developed,and the construction method of saturation line and the theoretical calculation method of seepage analysis are proposed. The seepage field before and after reinforcement is simulated and analyzed,and the total head and pressure head of the seepage field under the normal discharge water level before and after dam reinforcement are compared. The maximum seepage gradient in the concrete cut-off wall under the normal discharge water level,and the maximum seepage gradient of downstream dam shell material and the total seepage flow are solved and compared,and the reinforcement efficiency is comprehensively evaluated and analyzed qualitatively and quantitatively.