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粘性土料和非粘性土料填筑标准用什么指标控制?如何确定这些指标?

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2022-01-03 16:35
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正确答案

对不含砾或含少量砾的粘性土料,以干重度为设计指标,按击实试验最大干重度乘以压实系数确定,并用压实度来控制;对坝体的砂、砂砾、石料等同样要求进行填筑压实,但非粘性土的压实特性与含水量关系不大,主要与粒径级配和压实功能有密切关系,常用相对紧密度控制。
粘性土的控制指标:对Ⅰ、Ⅱ级坝和高坝,填土的压实度应不低于0.97—0.99;对Ⅲ级及其以下的坝(高坝除外)P应不低于0.95—0.97。
非粘性土的控制指标:要求达到密实状态,相对紧密度不低于0.70—0.75。在地震情况下,浸润线以上不低于0. 7,浸润线以下按设计烈度大小而定,一般不低于0.75—0.85。当非粘性土中粗粒含量小于50%时,应保证细料(小于5mm的颗粒)的相对密实度满足以上要求。


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