茅坪溪土石坝沥青混凝土心墙施工期变形分析

Deformation of asphalt concrete core wall of Maopingxi earth-rock dam in the stage of construction

介绍了茅坪溪防护土石坝施工期沥青混凝土心墙安全监测情况,对心墙应力、应变、变形及温度状态等观测资料进行了较详细的分析探讨。目前监测结果为:心墙底部压应力测值较理论计算值小,其增长与心墙高程升高关系协调。心墙不同高程处应变主要受温度、上部荷载及两侧过渡料性质影响,从测值分析心墙中上部应变随高程升高增长较快。心墙与过渡料间位错变形反映心墙压缩变形大于两侧过渡料沉降变形,且心墙中部变形较上、下部变形要大。底部心墙与基座间水平位移变形初期主要受施工影响,后期施工对其影响较小,总体变形稳定。分析表明心墙现阶段变形稳定,应变、应力测值和温度变化正常,工作性态良好,心墙与过渡料及填筑料间能协调变形,符合土石坝变形基本规律。

The stress,strain,deformation and temperature of the asphalt concrete core wall of Maopingxi earthrock dam in the stage of construction are analyzed according to the monitoring data.It is found that the stress at the base of the core wall is less than theoretical calculation result and increases with the increase of the core height.The temperature,load and the properties of transitional material are the main factors afecting the strain.Vertical displacement between core wall and transitional material exists,which implies that the compress deformation is greater tan the settlement deformation of transitional material.The horizontal displacement between core base and concrete foundation is affected only by the construction at the early stage.It is concluded that the asphalt concrete core wall is working normally,its deformation accords with the general deformation law of earthrock dam.