Earth-rock filling structure and construction method for pit and pond-type depressions

Abstract

The invention discloses a pit-pond type depression earthwork and stonework filling structure and a construction method. The structure comprises filling, a pit bottom fragment rock ponding cushion layer, depression peripheral bed rocks, bottom water guiding holes, gravel used for filling the water guiding holes, a catchwater around a filling body and a filling body main surface drainage ditch. The construction method of the structure comprises the steps that unwatering is conducted; side walls are dug into stepped slope faces; the water guiding holes are drilled; fragment rocks of the ponding cushion layer are stuffed and compacted; the filling is stuffed and tamped or compacted; and the drainage ditch is constructed. The problem of accumulated water drainage at the bottom of pit-pond type depression filling bodies such as ponds and ditches is solved, the stability and deformation performance of the filling bodies are improved, the work procedures are simple, the cost of adopted materials is low, the structure has good application prospects, and the structure and the method are particularly suitable for stratums with the relatively low pit bottom rock formation permeability coefficient.

Description

technical field [0001] The invention relates to a foundation and slope treatment technology. Background technique [0002] Mine dumps are piled up, airports, highways and railway traffic construction and other fields may encounter earthwork filling construction of ponds, deep ditches and other pit-type depressions, especially in mountainous areas. There are two prominent engineering hidden dangers in this type of filling body: 1. A water accumulation area may be formed at the bottom of the pit, especially when the bottom rock formation has poor water permeability. The water at the bottom not only produces a large buoyancy force on the upper filling, but also seriously reduces the shear strength of the saturated soil in the bottom water area, which in turn induces a catastrophe of the filling soil. A typical example is that at 11:40 on December 20, 2015, a landslide occurred in Hengtaiyu Industrial Park, Fenghuang Community, Guangming New District, Shenzhen, Guangdong Provin...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a pit pond type depression earthwork filling structure and construction method to solve the two technical problems of underground drainage and uneven settlement of the depression filling body after construction

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