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在1981年宝成线水害修复设计中,对宝成线北段两处冲刷特别严重的河岸地段,采用了沉井基础防护。沉井基础主要是参考《桥规》及有关规定,并结合路基冲刷防护特点进行设计的,内容包括稳定检算、沉降系数计算和结构计算等部分。现将其计算步骤分述如下: 一、设计资料沉井高度H=8m,填料及河床为砾石土,内摩擦角φ=35°,天然容重γ±=19kN/m~3,浮容重γt=12kN/m~3,刃脚斜面与土的摩擦角β_1=35°,土对井壁摩擦力f′=12kPa基底摩
In 1981 Baocheng line water damage repair design, the two sections of the northern part of Baocheng line washed particularly serious riverbank lots, using the caisson foundation protection. The foundation of caisson is mainly designed with reference to the “bridge gauge” and related regulations and combined with the characteristics of subgrade erosion protection. The contents include stability calculation, settlement coefficient calculation and structural calculation. Now the calculation steps are as follows: First, the design information Caisson height H = 8m, packing and riverbed gravel soil, internal friction angle φ = 35 °, natural bulk density γ ± = 19kN / m ~ 3, floating weight γt = 12kN / m ~ 3, the friction angle between edge of bevel edge and soil β_1 = 35 °, the friction of soil to wall lining f ’= 12kPa