Meyer Zygmunt, Olszewska Magdalena
Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology Szczecin, Al. Piastów 17, 70-310 Szczecin, Poland.
Materials (Basel). 2021 Nov 12;14(22):6842. doi: 10.3390/ma14226842.
Compressibility is one of the most important mechanical properties of soil. The parameter that characterizes compressibility is the constrained modulus of elasticity. Knowledge of this is important to calculate the settlement of a structure foundation on peat material. According to soil classification by EN ISO 14688-2, peat is an organic soil that contains min. 20% organic matter. It is a highly organic type of soil. Peat material has large compressibility. The value of the constrained elasticity modulus for peat is ca. 400 kPa, while it may be ca 1.0-1.6 MPa for consolidated peat. Due to the extensive range of the modulus, experimental research in this field is proposed. It is suggested to load the peat material layer with an embankment and to determine its total settlement. Based on this, a program was developed to determine the settlement-strain relationship. The authors propose an approach according to two models: the first is based on constant stress distribution in the soil with an oedometer test. The second considers the variability of stresses in the soil and the influence of the loaded area. Both methods were tested based on numerical simulations, and then an experimental field in Szczecin was used. The formulae for the constrained modulus of elasticity measurement were derived; in practical conditions, a uniaxial deformation state can be used with the combination of the total settlement.
压缩性是土壤最重要的力学性质之一。表征压缩性的参数是侧限弹性模量。了解这一点对于计算结构基础在泥炭材料上的沉降非常重要。根据EN ISO 14688-2的土壤分类，泥炭是一种含有至少20%有机质的有机土。它是一种高有机质类型的土壤。泥炭材料具有很大的压缩性。泥炭的侧限弹性模量值约为400 kPa，而固结泥炭的该值可能约为1.0 - 1.6 MPa。由于模量范围广泛，建议在该领域开展实验研究。建议用路堤对泥炭材料层加载并确定其总沉降量。基于此，开发了一个程序来确定沉降 - 应变关系。作者根据两种模型提出了一种方法：第一种基于用侧限压缩试验确定的土壤中恒定应力分布。第二种考虑了土壤中应力的变异性以及加载区域的影响。两种方法都基于数值模拟进行了测试，然后在什切青使用了一个试验场地。推导了侧限弹性模量测量的公式；在实际情况下，可以结合总沉降量使用单轴变形状态。
