RU2009104123A - METHOD FOR DETERMINING SOIL TEMPERATURE BY DEPTH OF FREEZING AT HIGH LEVEL OF GROUND WATER - Google Patents

Abstract

 1. The method of determining the temperature of the soil by the depth of freezing is characterized by the fact that the type of soil, its moisture, humidity at the boundary of plasticity, the number of plasticity, the density of dry soil for the layers within the seasonal freezing of the soil, then find the calculated value of 0 ° C penetration into the soil with the required security under the snow cover, or without it, according to the formula! ! where and are, respectively, the calculated values of the depth of penetration of 0 ° C into the soil under or without snow cover, determined from long-term observations at the hydrometeorological service for this settlement, required by the security calculations, m; ! df, c and df, 0 - the same, respectively, the calculated values of the depth of penetration of 0 ° C into the ground, under and without snow cover, in a built-up area, m; ! Kdf - coefficient taking into account the difference in humidity, density of dry soil and its thermal conductivity. on the built-up area from the ground at the observation post, determined by the formula! ! where λf and are, respectively, the thermal conductivity of frozen soil at the observation post and for the designed territory of the settlement, W / (m · t ° С), determined according to Table 3 of Appendix 1 [4]; ! and qf are, respectively, the amount of cold required to freeze free water in 1 m3 of soil, respectively, for the observation post and projected area, J / m3, determined according to Appendix 1 [4], after that, the distribution of negative soil temperature over the freezing depth is determined graphically, for which, first, according to the known distribution values, negative

Claims (1)

1. The method of determining the temperature of the soil by the depth of freezing is characterized by the fact that the type of soil, its moisture, humidity at the boundary of plasticity, the number of plasticity, the density of dry soil for the layers within the seasonal freezing of the soil, then find the calculated value of penetration of 0 ° C into the soil with the required security under or without snow cover, according to the formula

, Where

and

- accordingly, the calculated values of the depth of penetration of 0 ° C into the ground under or without snow cover, determined from long-term observations at the hydrometeorological service post for a given settlement, required by the security calculations, m; d _{f, c} and d _{f, 0} - the same, respectively, the calculated values of the depth of penetration of 0 ° C into the ground, under and without snow cover, in a built-up area, m; K _df - coefficient taking into account the difference in humidity, density of dry soil and its thermal conductivity. on the built-up area from the ground at the observation post, determined by the formula

, where λ _f and

- accordingly, the thermal conductivity of frozen soil at the observation post and for the designed territory of the settlement, W / (m · t ° С), determined according to Table 3 of Appendix 1 [4];

and q _f are, respectively, the amount of cold required to freeze free water in 1 m ^{3 of} soil, respectively, for the observation post and the designed area, J / m ³ , determined according to Appendix 1 [4], after that, the distribution of negative soil temperature over the freezing depth is determined graphically, for which, first, from the known values of the distribution of negative soil temperature over the freezing depth at the observation post, calculated with the required security for each interval equal to 0.4 m, starting from a depth of 0.8 m , a graph is constructed according to the depth of freezing, then the calculated values of the depth of penetration of 0 ° C into the ground for the built-up area with the same security as for the observation post, calculated by the formulas (1-2, are plotted along the ordinate axis at T = 0 ° С) ); from this point draw a parallel line to the previously obtained schedule within each interval for freezing depth and the resulting chart will correspond to the actual distribution of negative soil temperature over freezing depth for a built-up area with a high groundwater level.