Geotechnical Tools

A structured collection of calculation tools covering key areas of geotechnical engineering, from site characterisation to analytical methods.

<- Back to all tools

Liquefaction

Liquefaction Potential

Compare liquefaction-triggering screening using either the TBDY 2018 procedure or the Idriss and Boulanger (2008) SPT-based method.

Layered Samples Plot

Define the site earthquake inputs once, then screen multiple samples (by borehole and sample depth) with the selected liquefaction method.

Method

Earthquake magnitude, M_w

Peak Ground Acceleration, PGA (g)

Groundwater depth, GWT (m)

Narrow screen: swipe the table horizontally to see all columns and inputs.

Borehole ID	Sample depth(m)	Unit wt.(kN/m3)	Fines(%)	(N₁)₆₀	ΔN_(1,60)	(N₁)_60,cs	CRR_7.5	σ_v0(kPa)	Check¹	MSF	σ′_v0(kPa)	r_d	CSR	CRR_M	FS	Action
					1.15	13.15	0.141	54.0	Analysis	1.000	39.3	0.977	0.262	0.141	0.54 Sample depth: 3.00 m Liquefaction Potential!
					4.09	22.09	0.234	101.8	Analysis	1.000	62.5	0.958	0.304	0.234	0.77 Sample depth: 5.50 m Liquefaction Potential!

Borehole ID

Sample depth(m)

Unit wt.(kN/m3)

Fines(%)

(N₁)₆₀

ΔN_(1,60)

(N₁)_60,cs

CRR_7.5

σ_v0(kPa)

Check¹

MSF

σ′_v0(kPa)

r_d

CSR

CRR_M

Action

1.15

13.15

0.141

54.0

Analysis

1.000

39.3

0.977

0.262

0.141

0.54

Sample depth: 3.00 m

Liquefaction Potential!

4.09

22.09

0.234

101.8

Analysis

1.000

62.5

0.958

0.304

0.234

0.77

Sample depth: 5.50 m

Liquefaction Potential!

¹ See the Information tab for the layered screening criteria and method-specific check conditions.

Plot

Factor of Safety vs Depth

Depth is on the vertical axis; FoS is on the horizontal axis. Points with FoS < 1 are shown in red.

FoS ≥ 1FoS < 1

Important disclaimer

These results are simplified and indicative only. Please review the site-wide Disclaimer before using this tool in any engineering workflow.