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该文针对常州地区第(5)3层含细粒砂层，在深度19～31 m范围内开展旁压试验，得到反应土体力学特征的原始水平应力、强度与刚度等相关指标，并分析了土体刚度在不同应变水平下的衰减规律。研究结果表明:在剪应变小于0.01%时，土体不排水强度随深度变化大;剪应变大于0.1%时，不排水强度随深度变化较小。剪切模量随剪应变呈非线性关系，当剪应变小于0.3%时，剪切模量快速衰减;剪应变在0.3%～1.5%之间时，衰减速率逐渐下降;当剪应变大于3.0%后，剪切模量随应变变化趋于平缓，进入残余强度阶段。小应变条件下土体刚度对差异性敏感。
Abstract：This study conducted pressuremeter tests on the(5)_3silty sand layer containing fine particles in Changzhou City,at depths of 19 m to 31 m,obtaining relevant parameters such as original horizontal stress,strength,and stiffness reflecting the mechanical characteristics of the soil. The attenuation law of soil stiffness under different strain levels is also analyzed. The results show that when the shear strain is less than 0. 01%,the undrained strength of the soil varies with depth,while it varies little when the shear strain exceeds 0. 1%. The shear modulus exhibits a nonlinear relationship with shear strain. When the shear strain is less than 0. 3%,the shear modulus decays rapidly,and when it between 0. 3% and1. 5%,the rate of decay gradually decreases. When the shear strain exceeds 3. 0%,the shear modulus tends to stabilize with increasing strain,entering the residual strength stage. The soil stiffness is sensitive to variability under small strain conditions.
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基本信息:
中图分类号:U231
引用信息:
[1]罗元喜,郑鹤,刘正明,等.基于旁压试验的含细粒砂层力学特性研究[J].勘察科学技术,2025,No.263(04):17-21.
基金信息:
江苏省地质矿产勘查局科技创新项目(2022KY04); 国家重点研发计划课题(2018YFC1802401)