SU1250175A1 - Method of controlling line forms of erosion of soil and grounds - Google Patents

Description

The invention relates to the field of agricultural reclamation of unproductive lands, in particular those affected by linear forms of erosion, and can be used for restoring them by backfilling and flattening.

The purpose of the invention is to increase the efficiency of the method by preventing the appearance of shrinkage cracks in the contact zone of bulk and primary soils.

The method is carried out as follows.

Before filling the ravine, the granulometric composition of the soil is determined, with which it will be filled. Then, the maximum angle of the coastal slopes is determined, either experimentally or using the formula that needs to be given to the slopes of the primary soil so that the fracture does not manifest itself at a given granulometric composition, i.e., it is equal to zero. The slope angle is determined experimentally as follows. A sample of the soil to which the backfilling is carried out is placed in a special device with which the maximum inclination angle at which the shrinkage fracture is minimal is determined, i.e. equal to 0. Theoretically, the maximum inclination angle (y) is calculated using the regression equation

. . 210.24

23.10-0.1 bds-fgdels - the content of particles of physical clay in the soil, / o or "is removed from the curve of the aforementioned angles from the grain size distribution of the soil. This technique does not require constant use.

shrinking hogging devices, so they should be used.

Then, the slopes are cut off at an angle y and filled with known technology, filled with a ravine bed filled with loose soil. The bulk of the soil is compacted by the aisles of the tractor, then covered with a humified layer. Backfilling is carried out with some excess calculated on the volume shrinkage of the soil. Compared with the known technology, the proposed method has the advantage that in the contact zone of the primary and bulk soil, after the shrinkage of the latter, no cracks are formed, the reclaimed area is not destroyed, additional funds are not spent to repair damaged areas or to build expensive protective structures. The test results of the proposed method showed that already the first check

plots, carried out three months after their backfilling, showed that in the control plots (by a known method) along the right along the ravine there were 3 cracks: 4 m, 5 m, and 1.5 m long; 5, 4 and 3 cm, respectively, wide; 100,

80 and 90 cm - depth. In areas covered by the proposed method, there were no cracks. When retesting after 11 months, cracks were observed along the entire perimeter of the gauging part of the ravine (in the control areas). Their length is from 6 to

17 m, width from 2.5 to 8 cm, depth from 80 to 150 cm. In the ravine areas covered with the proposed technology no cracks were observed.

Claims (2)

1. METHOD FOR COMBATING LINEAR FORMS OF SOIL AND SOIL AEROSION, including filling them with bulk soil, compaction of the latter and laying on its surface a humus layer of soil, characterized in that, in order to increase the efficiency of the method by preventing the appearance of shrinkage cracks in the contact zone of bulk and of primary soils, determine the maximum angle of coastal slope of a linear form of erosion, at which shrinkage fracture of this soil does not occur, according to the equation Y = 23,10-0,16x4- ^g y4 where - the maximum angle of repose, degree:.. X - content of the clay particles in the physical bulk soil% and a bank slope angle impart linernyh erosion forms prior to filling them fill ground. 2. The method according to π. 1, characterized in that when backfilling with clay soil, the slopes give an angle of 13-25 °, heavy loam soil 26-30 °, medium loam soil 31-35 °, light clay soil 36-41 °. SU,. „1250175>