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Effective stress · σ' = σ − u
Effective stress · σ' = σ − u
σ'=σ−u · 分层土 · 总应力/孔压/有效应力随深度
Terzaghi's principle: total stress minus pore pressure carried by the soil skeleton
Mohr–Coulomb failure · τ = c + σ'·tanφ
Mohr–Coulomb failure · τ = c + σ'·tanφ
τ=c+σ'tanφ · 破坏包络线 · 莫尔圆相切判破坏
Failure envelope and Mohr circle on the σ–τ plane; tangent circle means failure
Lateral earth pressure · Rankine Ka / Kp
Lateral earth pressure · Rankine Ka / Kp
Ka=tan²(45−φ/2) · Kp · 主动/被动压力+合力
Active & passive pressure distributions and the resultant thrust on a retaining wall
Atterberg limits · plasticity chart
Atterberg limits · plasticity chart
液限/塑限/塑性指数PI · 液性指数 · 塑性图A线
Plasticity index, liquidity index and Casagrande classification
USCS soil classification
USCS soil classification
粒径%+界限 · USCS决策 · GW/SP/CL/MH组符号
Unified Soil Classification System · group symbol from index tests
Grain-size distribution
Grain-size distribution
筛分曲线 · D10/D30/D60 · Cu/Cc · 良/不良级配
Sieve analysis · gradation curve, D10/D30/D60, Cu & Cc
Terzaghi 1-D consolidation
Terzaghi 1-D consolidation
太沙基一维 · Tv=cv·t/H² · 固结度U+沉降历时
Time factor Tv = cv·t/H² sets the degree of consolidation U and the settlement S(t)
Darcy's law · seepage through soil
Darcy's law · seepage through soil
q=k·i·A · i=Δh/L · 渗流速度vs排出速度
Discharge q = k·i·A with hydraulic gradient i = Δh/L
Flow net · seepage under a dam
Flow net · seepage under a dam
q=k·H·Nf/Nd · 流槽数/等势降数 · 坝下流网
Seepage per unit width q = k·H·(Nf / Nd)
Terzaghi bearing capacity
Terzaghi bearing capacity
太沙基qu=cNc+qNq+0.5γBNγ · 承载力系数 · 容许值
Strip footing · qu = c·Nc + q·Nq + 0.5·γ·B·Nγ · factors from φ
Infinite-slope stability
Infinite-slope stability
无限边坡FoS · c/φ · 干/渗流工况 · 滑面
FoS = (c + (γz·cos²β − u)·tanφ) / (γz·sinβ·cosβ)
Retaining-wall stability
Retaining-wall stability
抗倾覆Mr/Mo · 抗滑移 · 朗肯主动土压+荷载
Rankine active thrust · overturning & sliding factors of safety