code: def load_soil_sample_data(sp):
      
      # soil
      sp.g_mod = 60.0e6  # [Pa]
      sp.phi = 30  # [degrees]
      sp.relative_density = .40  # [decimal]
      sp.gwl = 2.  # [m], ground water level
      sp.unit_dry_weight = 17000  # [N/m3]
      sp.unit_sat_weight = 18000  # [N/m3]
      sp.unit_weight_water = 9800  # [N/m3]
      sp.cohesion = 10.0  # [Pa]
      sp.poissons_ratio = 0.22
      sp.e_min = 0.55
      sp.e_max = 0.95
      sp.e_critical0 = 0.79  # Jin et al. 2015
      sp.p_critical0 = 0.7  # Jin et al. 2015
      sp.lamb_crl = 0.015
docs: Sample data for the Soil object
      :param sp: Soil Object
      :return: