高堆石坝砾石土心墙施工期应力监测与分析  

Stress monitoring and analysis of gravelly soil corewall in high rockfill dam during construction

作　　者：陈向浩[1] 邓建辉[1] 陈科文[1] 郑俊[1] 孟凡理[1] 徐亮[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,成都610065

出　　处：《岩土力学》2011年第4期1083-1088,1094,共7页Rock and Soil Mechanics

摘　　要：对于高堆石坝,施工期心墙内部是否会出现过低的竖向土压力或较高的孔隙水压力对施工期以及蓄水期大坝安全稳定具有重要意义。以施工期砾石土心墙应力监测资料为基础,结合施工进度和过程资料,分别从时间、空间和影响因素分析砾石土心墙施工期竖向土压力和孔隙水压力,以期对土质心墙高堆石坝的设计理论和施工措施的完善具有促进作用。竖向土压力主要和土重度、土柱厚度和拱效应有关,沿坝轴线基本为对称分布;心墙拱效应最强烈的部位大约在1/3坝高处坝轴线附近;存在拱效应的高程土压力呈驼峰状分布,坝轴线附近土压力最小。孔隙水压力主要和竖直土压力、含水率有关。在大坝填筑过程中,应加强心墙土料和上下游坝壳含水率的控制,避免过高孔隙水压力的产生,并降低拱效应的影响。For the high rockfill dam, whether too low vertical earth pressure or higher pore water pressure exists in the corewall or not has great significance for the security and stability of dam during construction as well as the impounding period. Combined with the construction schedule and procedure information, based on the monitoring data of gravelly soil core wall stress during the construction period, the soil pressure and pore water pressure in gravelly soil corewall during construction period are analyzed in time, space and effect factors respectively, with a view to improve design theory and construction measures of high rockfill soil corewall dam. Soil pressure primarily relates to soil bulk density, soil column thickness and the arching effect and symmetrically distributes along the dam axis. The strongest arching effect site is around the 1/3 height of corewall near the dam axis. At height with arching effect, the soil pressure is hump-shaped distribution and the minimum soil pressure is near the dam axis. Pore water pressures primarily relate to soil pressure and water content. At the dam filling process, to avoid the generation of excessive pore water pressure and reduce the impact of arching effect, the water content of the corewall material and the upper and lower dam shell should be strictly controlled.

关 键 词：砾石土心墙 孔隙水压力 土压力 拱效应 水力劈裂:监测 

分 类 号：TV641.4[水利工程—水利水电工程]