The article considers the problem of modeling temperature fields and stresses during the construction of a massive monolithic reinforced concrete structure in the form of a dock wall. The structure under consideration has a pier inside. The calculation is performed by the finite element method in a three-dimensional formulation using the ANSYS software package. The calculation takes into account the dependence of the elastic modulus of concrete, as well as its strength characteristics on the time and temperature of hardening. The relationships determining the kinetics of heat release of concrete, as well as the dependence of its properties on the degree of maturity are presented. Graphs of temperature changes in the thickness and on the surface of the structure, as well as graphs of stress changes at dangerous points are given. It is established that at the age of up to 4 days, the maximum tensile stresses exceed the tensile strength of concrete, which results in the formation of vertical cracks. The calculation results are confirmed by field survey data.