Influence of different geological geotechnical structures on the bearing properties of underground continuous wall base

Abstract

This work aims to study the influence of different geological and rock-soil structures on the bearing capacity of an underground continuous wall base. With an experimental area as the example, the geomorphology, rock mass, hydrology, and physical characteristics of the area are measured. The new geotechnical structure and wall base measurement experiments are conducted, and triaxial tests are carried out under varying temperature conditions, to study the influence of confining pressure and temperature on the deformation characteristics of the sample, as well as the influence of temperature on the strength characteristics of the sample. The results show that under the same temperature load, as the surrounding pressure increases from 100 to 400 kPa, the failure stress of the sample is gradually increasing when it reaches the failure strain. The shear strength of geological soft clay has a strong dependence on temperature. In the test range, as the temperature increases, the cohesive force c of soft clay decreases, and the value of the internal friction angle φ increases. The side friction resistance of the soft soil layer increased significantly after heating compared with that before heating. After standing for 112 days, the side friction resistance of 0–13.1 m remains unchanged, and the side friction resistance of the hard soil layer of 13.1–19 m increases, with an increase in the range of 20–28%. This work analyzes the influence of different geological and rock-soil structures on the bearing capacity of the continuous wall base and clarifies the important role played by geological rock and soil temperature, which provides a certain theoretical foundation and practical experience for the construction of the underground continuous wall base.