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۱Numerical Simulation of CPT Tip Resistance in Layered Soil
نویسنده(ها):
اطلاعات انتشار: هفتمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۸
The paper presents the results of a numerical modeling for cone penetration in layered soil. Experimental studies show that as the tip advances into different soil layers, it senses the effects of an approaching layer. The cone penetration tip resistance is influenced by the soil properties ahead and behind the tip. The interface distance over which the tip resistance senses the effect of a soil layer is reported to be 5 to10 times the
cone diameter. With the present analysis, the complete process of cone penetration is modeled as the cone starts to penetrate the soil from the ground surface to any deeper layers below the ground. This capability of the program enables the analysis of penetration in layered soil to be modeled in a realistic way. The commercial computer program FLAC is used for this analysis.<\div>

۲A Numerical Study of Chamber Size and Boundary E ects on CPT Tip Resistance in NC Sand
نویسنده(ها):
اطلاعات انتشار: Scientia Iranica، پانزدهم،شماره۵، ۲۰۰۸، سال
تعداد صفحات: ۱۳
A numerical modeling procedure was used to quantify calibration chamber size and boundary e ects for cone penetration testing in sand. In the numerical analyses, chamber diameter and boundary conditions were varied to investigate the e ects of chamber size and boundary conditions on cone tip resistance. These analyses show that, for loose sand, a chamber–tocone diameter ratio of 33 is sucient for the boundaries to have no in uence on the cone tip measurements. However, for very dense sand, the numerical analyses show that the chamberto– cone diameter ratio should be more than 100 to ensure that boundaries have no in uence on cone tip measurements. Numerical analysis indicates that, not only the sand relative density but its stress state is also a signi cant factor in in uencing the chamber size e ects. The results of the numerical analyses were compared to existing empirically based relationships. Suggestions are provided to reduce the e ects of chamber size and boundaries on cone tip resistance measurements in sand.
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