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陆水枢纽预填骨料压浆混凝土防渗墙,是砂卵石复盖层基础防渗处理的一种新方法,在国内尚属首次试用。通过实践,使我们的认识逐渐深化,在设计和施工中获得了一些初步经验,证明这种方法作为临时建筑物的基础防渗处理是成功的,同时发现这种基础处理方法也存在一些问题和缺点。现将陆水压浆混凝土防渗墙设计和施工的一些情况和休会作一介绍。一、防渗墙设针要求及预想效果陆水枢纽下游围堰修建在深8～11米、渗透系数达350～400米/昼夜的砂卵石复盖层上,围堰为粘土心墙石渣破壳坝。基础防渗系根据1959年试验成果,选定厚度为20厘米的预填骨料压浆混凝土防渗墙的方案。因大坝施工初期进度紧迫,该项防渗工程未及时完成,主坝基坑即开始抽水清基,虽在围堰迎水面作了长60米的粘土铺盖,渗水量仍然很大。一般枯水季当围堰下游水位为30米,基坑水
The Lushui Project pre-filled aggregate grouting concrete cutoff wall is a new method of impermeable treatment of sand-pebble overburden foundation and is the first trial in China. Through practice, we gradually deepen our understanding, obtained some preliminary experience in the design and construction to prove that this method as a temporary foundation impervious treatment is successful, and found that there are some problems with this basic treatment methods and Disadvantages. Now Lu land grouting concrete cutoff wall design and construction of some of the circumstances and adjournment for an introduction. First, the impermeable wall needle requirements and expected results Lushui downstream cofferdam built in deep 8 ~ 11 meters, the permeability coefficient of 350 ~ 400 m / day sand and gravel overlay, the cofferdam core wall gravel Broken shell dam. Foundation impermeable system According to the 1959 test results, selected thickness of 20 cm of pre-grouting mortar concrete cutoff wall program. Due to the urgent progress in the early construction of the dam, the seepage control project was not completed in time, and the foundation pit of the main dam started pumping clear water. Although the length of the cofferdam was 60 meters, the water seepage was still large. The general dry season when the cofferdam downstream water level of 30 meters, pit water