Loess high-fill furrow foundation drainage structure and laying method thereof

Abstract

The invention discloses a loess high-fill furrow foundation drainage structure and a laying method thereof. The drainage structure comprises a main blind ditch laid on an original loess foundation inthe extending direction of a main ditch in an original valley terrain, and a secondary blind ditch laid on the original loess foundation in the extending direction of a branch ditch in the original valley terrain and communicating with the main blind ditch. The elevation of a base surface at a communication position of the secondary blind ditch and the main blind ditch is equal to that of the basesurface of the main blind ditch at the position; and the cross section of the secondary blind ditch and the cross section of the main blind ditch are full-gravel cross sections. The laying method comprises the following steps: 1, cleaning surface soil of the original loess foundation and carrying out topographic survey; 2, constructing the main blind ditch; 3, constructing the secondary blind ditch; 4, communicating the secondary blind ditch with the main blind ditch; 5, investigating whether a steep rock slope exists in the construction area or not; and 6, constructing a vertical drainage blind ditch. The loess high-fill furrow foundation drainage structure is stable in structure, large in porosity, smooth in drainage, high in anti-clogging performance and capable of effectively solvingthe drainage problem of an existing loess high-fill project original valley foundation.

Description

technical field [0001] The invention belongs to the technical field of drainage of loess high-fill ditch foundations, and in particular relates to a drainage structure of loess high-fill ditch foundations and a laying method thereof. Background technique [0002] With the rapid development of my country's economy and the rapid advancement of urbanization, many areas have experienced a shortage of construction land. Under the premise of moderate development, filling projects such as "cutting mountains and filling ditches" and "rectifying ditches to make land" have become one of the important decisions and development directions for the development, utilization and reserve protection of my country's land resources. The high loess fill project will change the natural drainage conditions of the area after the filling construction. If the drainage system is not properly set up in the early stage, the groundwater level will easily rise in the later stage of the project, endangerin...

AI Technical Summary

Problems solved by technology

The natural drainage conditions of the area will be changed after the filling construction of the high loess filling project. If the drainage system is not properly set up in the early stage, the groundwater level will easily rise in the later stage of the project, endangering the stability of the filling body

In particular, the "water-sensitive characteristics" of loess make the entire loess high fill project extremely sensitive to changes in the water environment. When the drainage of the original valley foundation is improperly set, the rise of the water level can easily cause slope instability and large-scale subsidence of the ground. , thus affecting the quality, safety and practicability of the project

[0003] There are two types of basic structure of conventional drainage blind ditch: one is blind ditch drainage structure filled with gravel, this type of structure is stable, strong and not easy to collapse, but it is prone to silting and failure if it is not installed properly; The other is a structural form in which large-diameter culvert pipes are wrapped with crushed stones to form a hollow drainage blind ditch. Although this structure drains smoothly in a short period of time, the concrete and steel cages of the culvert pipes are prone to corrosion and rust. It may cause splitting, collapse and damage to the circular culvert, especially the lower semicircular part of the culvert, shorten the service life of the blind ditch, and cause the upper ground to collapse

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