Simulation of the Centrifuge Test of Shallow Clay Strength Measured by LRMP Based on CEL Method
高浩喆 1张宇 1孙念1
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作者信息
1. 大连交通大学土木工程学院,辽宁 大连 116028
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摘要
软土海床/河床浅层土体强度对管线铺设等工程设计具有重要影响.基于CEL方法对LRMP测试浅层软土强度离心试验进行模拟,验证了CEL方法的可靠性,讨论了土体弹性模量和LRMP入土深度对水平受力系数的影响.计算结果显示,土体弹性模量对CEL计算得到的水平受力系数影响不大,可根据模拟土体的变形特性在300 su～900 su 选取弹性模量数值;使用LRMP测量土体0.4 D～1 D强度时,可取水平受力系数为10.5,但土体强度梯度对水平受力系数有显著影响,当测量自重固结土时,使用Nh=10.5会低估土体的真实强度,需通过标定试验确定目标土体Nh 随土体强度梯度的变化规律,计算得到的规律可为测量软土浅层平均强度的相关试验设计和数值模拟提供技术参考.
Abstract
The strength of the shallow soil of the soft seabed/riverbed plays an important role in the engineering design of pipeline laying.The centrifuge test of LRMP test for shear strength of shallow soft soil is simulated based on CEL method.The reliability of the CEL method is verified,and the effects of soil elastic modulus and LRMP penetration depth on the horizontal force coefficient are discussed.Based on the results of the CEL calculations,the elastic modulus of soil has little effect on the horizontal force coefficient,and the value of the elastic modulus can be selected in the range of 300 su～900 suaccording to the deformation characteristics of the simulated soil.When using LRMP to measure the strength of soil in the range of 0.4 D～1 D,the horizontal force coefficient can be taken as 10.5.The soil strength gradient has significant influence on the value of Nh,which can lead to underestimating of soil strength using Nh=10.5.Therefore,it is necessary to determine the variation pattern of Nh with soil strength gradient through calibration experiments.These results can provide technical reference for the experimental design and numerical simulation of measuring the average shear strength of shallow soft soil.
关键词
LRMP/浅层软土强度/受力系数/CEL方法
Key words
LEMP/Shear strength of shallow soft soil/Force coefficient/CEL method
维普
万方数据