From adee9265f2335c675de676e646814a4014cf96f1 Mon Sep 17 00:00:00 2001
From: Nielszee92 <63580963+Nielszee92@users.noreply.github.com>
Date: Tue, 20 Aug 2024 12:06:23 +0200
Subject: [PATCH] Update robertson_cpt_interpretation.py

adjusted calculation of PWP, the abs made the effective stress equal to the total stress
---
 .../robertson_cpt_interpretation.py                             | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/geolib_plus/robertson_cpt_interpretation/robertson_cpt_interpretation.py b/geolib_plus/robertson_cpt_interpretation/robertson_cpt_interpretation.py
index c9d56de..103d146 100644
--- a/geolib_plus/robertson_cpt_interpretation/robertson_cpt_interpretation.py
+++ b/geolib_plus/robertson_cpt_interpretation/robertson_cpt_interpretation.py
@@ -386,7 +386,7 @@ def stress_calc(self):
         z_aux = np.min(
             [self.data.pwp, abs(self.data.depth_to_reference[0]) + self.data.depth[0]]
         )
-        pwp = (z_aux - abs(self.data.depth_to_reference)) * self.data.g
+        pwp = (z_aux - self.data.depth_to_reference) * self.data.g
         # no suction is allowed
         pwp[pwp <= 0] = 0
         # compute effective stress