PEYSANJ Geotechnical Software

Allowable bearing capacity of shallow foundations

Using this feature you can compute allowable soil stress by simultaneously processing SOIL FAILURE and SETTLEMENT behavior of soil below foundation. To do this, two different curves are drawn for each footing width, so that the user can compare FAILURE and SETTLEMENT controlled data for an specific footing. Then PEYSANJ chooses the lowest point of these two curves as the ALLOWABLE soil stress for corresponding footing. For raft foundations, stress-settlement diagram is calculated.

Multi-layer stratigraphy could be processed by the program, also all related input data such as "allowable settlement", "safety factor", etc. could be specified by user.

Soil failure is calculated based on "Hanson" method. Settlements could be calculated based on the following methods : "Steinbrenner and Goodier (Timoshenko)", "Elastic and Rigid layers (a methods)"

Pressure-meter test analysis

Processing pressuremeter tests could be easily done with PEYSANJ. Calculation process is based on ASTM D4719 and input data consist of "calibration data", "field test P and V readings", "water level" and etc.

After selecting the elastic region of the P-V curve, Menard modulus (Em) and limit pressure (Pl) are reported as the main results. P versus V diagram is also presented in outputs.

Plate loading test

This test is widely used to determine soil elasticity modulus (Es) and also modulus of subgrade reaction (Ks). Input data consist of couples of "load (P)" applied on plate and "settlement (S)" of the plate. Then PEYSANJ will separate different loading-unloading cycles and calculate a Ks coefficient for each one.

P-S diagram is also presented in outputs.

Soil liquefaction analysis

Soil liquefaction is a disastrous phenomenon occurred during earthquake because of pore pressure build-up in sand layers. There are several methods to check the potential of soils against liquefaction.

PEYSANJ uses 8 different methods, based on SPT, BDT or Vs (shear wave velocity) tests data:

Japan' Bridge Code
Chinese Code
Seed et al. (1983)
Tokimatsu-Yoshimi (1983)
Shibata 1981
Kokusho et al. (1983)
NCEER 1996
Vancouver Task Force 2007

PEYSANJ draws shear stress ratios (resistant / loaded) or CRR and CSR during earthquake with an assumed magnitude. Available safety factor (FS) vs depth is computed as well as post-liquefaction lateral deformation and vertical settlement.

Lateral Earth Coefficient

K values are calculated in two conditions:

Static : based on Rankin formula (Ka, Ko, Kp)

Dynamic : based on Mononobe-Okabe formula (Kae, Kpe)

The author has provided the web visitors with a free version of calculator for K values; Click here for more information:

http://www.afkhami.com/GeoCalc.aspx?CalcType=K_in

Stress Distribution Below Foundation

With a specific foundation, the stress variation below it could be presented based on two methods in depth:

1- Slope 2:1

2- Uniform Rectangle Load (Westergard)

Also PEYSANJ is able to calculate and draw stress behind retaining wall under a load behind it.

	Stress Distribution Behind Retaining Wall
	Also PEYSANJ is able to calculate and draw stress behind retaining wall when there is a load behind it. It can sum the Rankin stress with this overburden stress.	more