某黏土心墙砂砾石坝安全监测及工程性状分析

介绍了某黏土心墙砂砾石坝的安全监测成果。由于主坝左坝肩边坡陡峭,是该工程的重点薄弱部位,特采用TS型位移计和GKD型孔隙水压力仪观测防渗心墙与岸坡混凝土接触部位的变形和渗流状态。监测成果表明,尽管该大坝的边坡满足规范要求,但仍在左坝肩心墙与混凝土垫层接触面出现了较大的变形和渗流异常,因此,认为在进行心墙坝的岸坡坡度设计时,除了应满足规范要求外,确定什么样的边坡可以防止因防渗心墙的不均匀沉降而致产生裂缝应作专门研究,应加强心墙重点部位的渗流观测,在进行黏土心墙坝的有限元计算时,对施工期和蓄水期应分别选用非饱和及饱和两套土性指标。

Analysis of engineering behavior of a dam with clay core

Safety monitoring results of a dam with clay core are presented. As the left abutment of the major dam is very steep, the TS type displacement transducers and GKD type pore water pressure transducers are installed to monitor the displacement and seepage of the joint part of clay core and the abutment. The results show that although the stability of the slope of the dam satisfies the criterion, significant displacement and seepage occur at the interface between left abutment and clay core.Therefore, in designing the bank slope of the dam, special attention must be paid to prevent the displacement and the crack resulted.Seepage at key parts in the dam should be observed. Moreover, in numerical analysis of the dam by finite element method, two set of material constants should be chosen to signify the saturated and unsaturated situations corresponding to construction period and water storage period. 