schiffmanandstein1970¶
Class summary¶
SchiffmanAndStein1970([reader, pkg_for_version]) |
One-dimensional consolidation of layered systems |
Module listing¶
Schiffman and Stein 1970 “One-Dimensional consolidation of layered systems”.
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class
geotecha.consolidation.schiffmanandstein1970.SchiffmanAndStein1970(reader=None, pkg_for_version='geotecha')[source]¶ Bases:
geotecha.inputoutput.inputoutput.InputFileLoaderCheckerSaverOne-dimensional consolidation of layered systems
Implements Schiffman and Stein (1970) [R14].
Features:
- Vertical flow, multiple layers.
- Soil properties constant with time.
- Drained or Undrained boundary condtions. Also possbile to have stiff high peremability impeding layers at top and bottom.
- Load is uniform with depth but varies piecewise-linear with time.
- Pore pressure vs depth at various times.
- Average pore pressure vs time. Average is over the entire soil layer.
- Settlement vs time. Settlement is over whole profile.
Warning
The ‘Parameters’ and ‘Attributes’ sections below require further explanation. The parameters listed below are not used to explicitly initialize the object. Rather they are defined in either a multi-line string or a file-like object using python syntax. It is the file object or string object that is used to initialize the object. Each ‘parameter’ will be turned into an attribute that can be accessed using conventional python dot notation, after the object has been initialised. The attributes listed below are calculated values (i.e. they could be interpreted as results) which are accessible using dot notation after all calculations are complete.
Parameters: z : list/array of float
Depth to calc pore pressure at.
t : list/array of float
Time values to calc time variation of parameters at.
tpor : list/array of float
Time values to calc pore pressure profiles at.
h : list/array of float
Layer thicknesses.
n : int, optional
Number of series terms to use. Default n=5.
kv : list/array of float
Layer vertical permeability divided by unit weight of water.
mv : list/array of float
Layer volume compressibility.
bctop, bcbot : [0, 1, 3]
Boundary condition. bctop=0 is free draining, bctop=1 is impervious, bctop=3 is impeded by stiff layer of thickness htop and permeability ktop.
htop, hbot : float, optional
Thickness of top and bottom impeding layer. Only used if bcbot==3 or bctop==3.
ktop, kbot : float, optional
Top and bottom impeding layer vertical permeability divided by unit weight of water. Only used if bcbot==3 or bctop==3.
surcharge_vs_time : PolyLine
Piecewise linear variation of surcharge with time
show_vert_eigs : True/False, optional
If true a vertical eigen value plot will be made. This is useful to to chekc if the correct eigenvalues have been found. Default show_vert_eigs=False
plot_properties : dict of dict, optional
dictionary that overrides some of the plot properties. Each member of plot_properties will correspond to one of the plots.
plot_properties description por dict of prop to pass to pore pressure plot. avp dict of prop to pass to average pore pressure plot. set dict of prop to pass to settlement plot. see geotecha.plotting.one_d.plot_vs_depth and geotecha.plotting.one_d.plot_vs_time for options to specify in each plot dict.
save_data_to_file : True/False, optional
If True data will be saved to file. Default save_data_to_file=False
save_figures_to_file : True/False
If True then figures will be saved to file. Default save_figures_to_file=False
show_figures : True/False, optional
If True the after calculation figures will be shown on screen. Default show_figures=False.
directory : string, optional
Path to directory where files should be stored. Default directory=None which will use the current working directory. Note if you keep getting directory does not exist errors then try putting an r before the string definition. i.e. directory = r’C:Users...’
overwrite : True/False, optional
If True then existing files will be overwritten. Default overwrite=False.
prefix : string, optional
Filename prefix for all output files. Default prefix= ‘out’
create_directory : True/Fase, optional
If True a new sub-folder with name based on prefix and an incremented number will contain the output files. Default create_directory=True.
data_ext : string, optional
File extension for data files. Default data_ext=’.csv’
input_ext : string, optional
File extension for original and parsed input files. default = ”.py”
figure_ext : string, optional
File extension for figures. Can be any valid matplotlib option for savefig. Default figure_ext=”.eps”. Others include ‘pdf’, ‘png’.
title : str, optional
A title for the input file. This will appear at the top of data files. Default title=None, i.e. no title.
author : str, optional
Author of analysis. Default=’unknown’.
See also
geotecha.piecewise.piecewise_linear_1d.PolyLine- how to specify loadings
References
[R14] (1, 2) Schiffman, R. L, and J. R Stein. ‘One-Dimensional Consolidation of Layered Systems’. Journal of the Soil Mechanics and Foundations Division 96, no. 4 (1970): 1499-1504. Attributes
por (array of shape (len(z), len(tpor))) Pore pressure vs depth at various times. Only present if tpor defined. avp (array of shape (1, len(t))) Averge pore pressure of profile various times. Only present if t defined. set (array of shape (1, len(t))) Surface settlement at various times. Only present if t defined. Methods
calc_por()Calculate pore pressure at depth and time calc_settle_and_avp()Calculate settlement and average pore pressure at time check_input_attributes()Perform checks on attributes make_all()make_output, produce files and plots make_output()Perform all calculations plot_characteristic_curve_and_roots([npts])Plot the characteristic curve for the problem showing roots produce_plots()Produce plots of analysis