给水排水构筑物结构设计规范中侧向主动土压力公式为 F=Kγz 其中规范说明 K 应按土的抗剪强度确定,无试验资料时粘性土可按1/3-1/4取值。K=tg2(45-φ/2)我设计挖孔井(10m深)时没有地质资料,计算土压力时取K=1/3,后来地质资料出来后,φ=14°,我按K=tg2(45-φ/2)计算得0.62,即使考虑c值也比按K=1/3大了一倍。按我的理解,无试验资料时粘性土取K=1/3应该是偏于安全的,怎么会按c、φ值计算反而土压力变大?!
给水排水构筑物结构设计规范中侧向主动土压力公式为 F=Kγz 其中规范说明 K 应按土的抗剪强度确定,无试验资料时粘性土可按1/3-1/4取值。K=tg2(45-φ/2)
我设计挖孔井(10m深)时没有地质资料,计算土压力时取K=1/3,后来地质资料出来后,φ=14°,我按K=tg2(45-φ/2)计算得0.62,即使考虑c值也比按K=1/3大了一倍。
按我的理解,无试验资料时粘性土取K=1/3应该是偏于安全的,怎么会按c、φ值计算反而土压力变大?!
实在不明白,K应该怎么计算?
有那位高手指点一下,在这里先多谢了!!
2楼
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3楼
ddddd
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4楼
主要是φ的取值,对于一般回填土为粘性土,其值一般为30°,所以就应该是1/3,水池周边肯定是要开挖的,回填土也不可能和原状土相比(可看规范的条文说明).我是做土建的,我们现在一般用的是静止土压力(0.5),原来也用1/3
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5楼
主要是φ的取值,对于一般回填土为粘性土,其值一般为30°,所以就应该是1/3,水池周边肯定是要开挖的,回填土也不可能和原状土相比(可看规范的条文说明).我是做土建的,我们现在一般用的是静止土压力(0.5),原来也用1/3
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6楼
我设计的是挖孔井,不开槽施工,没有回填土,c、φ只能按地质报告取。
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7楼
顶一下
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8楼
再顶一下
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9楼
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10楼
0.5的系数是这样来的
按国标图集05S804(矩形钢筋混凝土蓄水池)总说明,φ的取值为20,Ka=tg^2(45-φ/2)=0.49
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11楼
我认为粘性土的内摩擦角要用换算后的值(粘聚力的作用)
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