Monolithic reticular structure made of plastic material for geotechnical applications, said reticular structure comprising: - a plurality of first elements distanced from each other and having an elongated conformation according to a first prevalent development path, - a plurality of second elements distanced from each other and having an elongated conformation according to a second prevalent development path, transverse, optionally orthogonal, to the first prevalent development path of the first elements, wherein said first and second elements (3, 4) intersect at nodes to form meshes, wherein the first elements have, at least at a mid-portion defined between two nodes immediately consecutive with respect to a plane orthogonal to the first prevalent development path, a substantially T-shaped section comprising: - at least one elongated base extending along a direction of development, - at least one elongated protuberance emerging substantially orthogonally from the base, wherein the second elements have, at least at a mid-portion defined between two nodes immediately consecutive with respect to a section orthogonal to the second prevalent development path, at least one respective elongated base extending along a respective direction of development, the monolithic reticular structure being a bi-stretched reticular structure able to be stretched along the direction of the two developments of the first and of the second elements (3, 4), wherein the first elements are able to be stretched along their development, wherein the stretch ratio of the first elements is defined as the ratio between a final length of the same first elements after the stretching action thereof is carried out and an initial length of said first elements before the stretching action, wherein the second elements are able to be stretched along their development, wherein the stretch ratio of the second elements is defined as the ratio between a final length of the second elements after a stretching action thereof and an initial length of the second elements before the stretching action, characterized by the fact that the bases (3a, 4a) respectively of the first and second elements (3, 4) are joined in a single piece to define a single bottom surface opposed to the protuberances of the first elements, and in that the bottom surface of the reticular structure, defined by the bases (3a, 4a) respectively of the first and second elements (3, 4), have a substantially planar conformation. - a plurality of first elements distanced from each other and having an elongated conformation according to a first prevalent development path, - a plurality of second elements distanced from each other and having an elongated conformation according to a second prevalent development path, transverse, optionally orthogonal, to the first prevalent development path of the first elements, wherein said first and second elements (3, 4) intersect at nodes to form meshes, wherein the first elements have, at least at a mid-portion defined between two nodes immediately consecutive with respect to a plane orthogonal to the first prevalent development path, a substantially T-shaped section comprising: - at least one elongated base extending along a direction of development, - at least one elongated protuberance emerging substantially orthogonally from the base, - at least one elongated base extending along a direction of development, - at least one elongated protuberance emerging substantially orthogonally from the base, wherein the second elements have, at least at a mid-portion defined between two nodes immediately consecutive with respect to a section orthogonal to the second prevalent development path, at least one respective elongated base extending along a respective direction of development, the monolithic reticular structure being a bi-stretched reticular structure able to be stretched along the direction of the two developments of the first and of the second elements (3, 4), wherein the first elements are able to be stretched along their development, wherein the stretch ratio of the first elements is defined as the ratio between a final length of the same first elements after the stretching action thereof is carried out and an initial length of said first elements before the stretching action, wherein the second elements are able to be stretched along their development, wherein the stretch ratio of the second elements is defined as the ratio between a final length of the second elements after a stretching action thereof and an initial length of the second elements before the stretching action, characterized by the fact that the bases (3a, 4a) respectively of the first and second elements (3, 4) are joined in a single piece to define a single bottom surface opposed to the protuberances of the first elements, and in that the bottom surface of the reticular structure, defined by the bases (3a, 4a) respectively of the first and second elements (3, 4), have a substantially planar conformation.