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基坑支护施工方案十一 | 2011-2-15 13:47:00
现场安全资料实例(171)基坑支护施工方案十一
基坑支护施工方案十一
基坑支护施工方案十一 (1) 水泥土围护墙结构按承载能力极限状态验算抗倾覆稳定性时,应满足下式:
式中 γl——侧压力分项系数,取1.1; MEk——坑外土体侧压力对墙底前趾的倾覆力矩标准值(kN·m); γQ——地表分布荷载分项系数,取1.0; MEqk——坑外墙后地表面分布荷载所产生的侧压力对墙底前趾的倾覆力矩标准值(kN·m); γRQ——倾覆抗力分项系数,取1.05; MGk——水泥土围护墙(包括水泥土搅拌桩墙体和格栅内地基土)的自重对墙底前趾的稳定力矩标准值(kN·m); Mpk——坑内墙前被动侧压力对墙底前趾的稳定力矩标准值(kN·m)。 (2) 水泥土围护墙结构按承载能力极限状态验算沿墙底面的抗滑动稳定性时,应满足下式:
式中 Ek——坑外侧压力标准值(kN); Eqk——坑外墙后地表分布荷载作用所产生的侧压力标准值(kN); γRH——滑移抗力分系数,取1.1; Gk——水泥土围护墙结构的自重标准值(kN); C0k, φ0k——分别为水泥土围护墙墙底地基士的粘聚力标准值(kPa)和内摩擦角标准值(°); B——水泥土围护墙的墙体宽度(m); Epk——坑内墙前被动侧压力标准值(kN)。 |
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