Evaluation of dynamic probing testing effect in hand excavated pit on test results using numerical modeling

Document Type: Original Article

Authors

1 Faculty of Engineering, University of Qom, Qom, Iran

2 Department of Geology, University of Tehran, Tehran, Iran

Abstract

In Iran,using of the hand excavated pits(wells)have been more common compare to the other countries. However,recently in Iran,utilizing the dynamic probing test(DPT)in these types of pits has been significantly developed. This is while the standard state of doing this test is from the ground level. In this work, the dynamic probing test is carried out in two similar wells with diameter of 1m and the depth of 10m,in two areas of Qom city in Iran,one has silty sand soil and the other is clay. Then, both tests are simulated using numerical modeling in Abaqus software and the results obtained from the simulation are compared and calibrated with the values obtained at the mentioned sites. The results show a good agreement between the values obtained from the simulation and tests are done in the sites. After calibrating the simulated values with the values obtained from the site, we perform the simulation this time,for the standard state(It means that the test is done from the ground level or with the assumption without well),as deep as 10m and for both areas and with the mentioned soils specifications. The results show 35 and 22 percent difference in the dynamic resistance of cone’s tip between the testing in standard state and hand excavated pit,for silty sand and clay soils, respectively. Finally,using the simulation,we present the relations between the depth of the doing the test and dynamic resistance of cone’s tip for both states mentioned and both types of the soils that studied in this paper.

Keywords