现场安全资料实例（168）基坑支护施工方案八

现场安全资料实例（168）基坑支护施工方案八

基坑支护施工方案八

基坑支护施工方案八

水泥土围护墙设计验算方法

(1) 水泥土围护和板式支护基坑，按承载能力极限状态验算基坑开挖后地基土的抗渗流（或抗管涌）稳定性时，应满足下式：

式中 γ_o——结构重要性系数，按2.0.4条和10.1.7条规定执行，一般可取1.0；

γ_s——渗流作用分项系数，取1.05；

γ_RS——渗流抗力分项系数，取2.0；

i ——坑内渗流出口平均水力坡降，取

B——基坑围护墙防渗帷幕墙的厚度（m）；

h₁,h₂——分别为坑外和坑内计算地下水位距围护墙防渗帷幕墙底面的深度（m）；

G_s——坑底标高处地基土的比重；

e——坑底标高处地基土的天然孔隙比。

(2) 地基土中埋藏有承压含水层，需验算基坑开挖后坑内地基土抗承压水头的稳定性时，应满足下式：

式中 γ_y——承压水作用分项系数，取1.05；

γ_Ry——承压水抗力分项系数，取1.0；

p_wyk——承压水压力标准值（kPa），由工程勘察试验确定；

p_czk——坑底至承压含水层顶板间覆盖土层的自重标准值（kN/m²），地下水位以下按饱和重度计算。

By:苏州愚人 | 阅读全文 | 回复(11) | 引用通告 | 编辑

标签：安全台账

圈子：注安之家

Re:在漫画中识别身边的违章 | 2017-3-4 14:53:00

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Re:在漫画中识别身边的违章 | 2017-3-4 13:07:49

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Re:在漫画中识别身边的违章 | 2016-10-23 13:08:55

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By:fjnjn(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复

Re:在漫画中识别身边的违章 | 2016-10-21 3:05:14

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Re:在漫画中识别身边的违章 | 2016-10-11 18:00:19

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By:tphmp(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复

Re:在漫画中识别身边的违章 | 2016-10-10 3:12:00

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By:bgkqt(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复

原创 | 2016-9-30 16:13:21

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原创 | 2016-9-28 21:32:16

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原创 | 2016-9-6 21:55:13

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