The intense development of urban infrastructure and the construction of deep excavations mean, that diaphragm walls are becoming one of the typical structural elements of this type of facilities, the stability of which is ensured by a system of steel struts. The paper focuses on the assessment of the value of the force in the steel tubular strut caused by the temperature difference and values of parameters necessary for proper analysis of diaphragm wall displacements. Using statistical methods to analyse more than 100,000 data from various measurements, the values of the m coefficient describing force increase in the strut at a temperature change of 1⁰C were determined. The analyses allowed to determine values of the m coefficients recommended in the design of strutted diaphragm walls. These values can be used in design practice when it is necessary to determine an additional force in the steel tubular strut due to the temperature difference.