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基坑支护施工方案六 | 2011-2-15 12:53:00
现场安全资料实例(166)基坑支护施工方案六
基坑支护施工方案六
基坑支护施工方案六 1. 水泥土围护墙设计验算方法 (1) 主动土压力强度标准值的计算方法 当坑外地表面为水平面,基坑围护墙背为竖直面时,由土体本身产生的主动土压力强度标准值eak和由地表面均布荷载作用产生的主动土压力强度标准值eaqk,可按下列公式计算:
式中 eak——计算点处由土体本身产生的主动土压力强度标准值(kPa),当eak < 0时,一般取eak=0; eaqk——计算点处由地表面均布荷载产生的主动土压力强度标准值(kPa); γi——计算点以上各层土的重度(kN/m3),地下水位以上土层取天然重度;地下水位下土 层取浮重度; hi——计算点以上各层土的厚度(m); qk——坑外地表面均布荷载标准值(kN/m2),应按实际情况取值,通常可按20kN/m2试算; ka——计算点处土的主动土压力系数,取 φk——计算点处土的内摩擦角标准值(o),一般情况下按直剪固快试验的峰值平均值确定; ck——计算点处土的粘聚力标准值(kPa),一般情况下按直剪固快试验的峰值确定。 |

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