Assess the effects of loading rate and interface roughness on T-bar penetration resistance

Assess the effects of loading rate and interface roughness on T-bar penetration resistance
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评估加载速率和界面粗糙度对 T 形杆穿透阻力的影响

DOI:
10.1016/j.sandf.2020.02.003
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发表时间:
2020-02
影响因子:
3.7
通讯作者:
Kong Deqiong
Kong Deqiong
中科院分区:
工程技术3区
文献类型:
--
作者:
Zhu Bin;Dai Jialin;Kong Deqiong

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采用最近开发的顺序极限分析方法来研究 T 形贯入仪在软粘土中的大位移贯入行为,并考虑应变软化和应变速率的影响。在达到理想的全流状态之前,密切关注界面粗糙度和应变率对渗透响应的影响,以便为改进地表土的原位强度估计提供一些线索。通过两次小型实验室试验和一次离心机试验的比较,以及T形杆从土壤表面刺入超过5个直径的深度的参数研究,证实了模型的有效性。推导出解析方程,评估界面粗糙度、粘度参数和刺入速度对T形杆刺入阻力的影响。
A recently developed sequential limit analysis method was employed to look into the large displacement penetration behaviour of T-bar penetrometers in soft clay, considering the effects of strain softening and strain rate. Close attention was paid to the effects of interface roughness and the strain rate on the penetration response, before reaching an ideal full-flow state, in order to shed some light on the improved estimate of thein situstrength of surficial soil. The validity of the model was confirmed through a comparison of two small-scale laboratory tests and one centrifuge test, followed by a parametric study in which a T-bar was penetrated from the soil surface to a depth of over five diameters.Analytical equations were derived to assess the effects of interface roughness, viscosity parameter and penetration rate on the T-bar penetration resistance.
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