Method of leading Yellow River silt to fill reclamation coal mining subsidence land

Abstract

The invention relates to a method of leading silt in the Yellow River to fill reclamation coal mining subsidence land, and belongs to the technical field of mine environment protection. The method comprises confirming distributing characteristics of time and space and the amount of required silt of the coal mining subsidence land to be filled through methods of remote-sensing images, mining subsidence prediction and field investigation, selecting silt-taking points and silt-taking equipment according to the river regime of the Yellow River, a riffle area distributing condition and the positions of subsidence regions, conveying silt through pipelines composed of a main pipe and branch pipes, setting up a relaying booster pump station, guaranteeing long-distance conveying of the silt, taking reclamation steps such as direct surface soil stripping, stripping after drainage and direct filling against regions to be filled, then conveying silt to fill the regions to be filled, timely draining in the filling process to accelerate silt sediment, covering filled silt with peripheral stripping soil or covering the filled silt with soil dressing, and forming filling reclamation land with high productivity.

Description

technical field [0001] The invention belongs to the technical field of mine environmental protection, and in particular relates to the analysis of the filling position and sand demand for long-distance filling of coal mining subsidence in high-water level plain mining areas, methods for taking sand, transporting sand, and filling and re-cultivating. technical background [0002] In the eastern plains of China, there are several large mining areas such as Huainan, Huaibei, Xuzhou, Yanzhou, and Jining. Due to the high underground water level in these areas, water accumulation after subsidence is serious, and the loss of cultivated land in some areas can reach more than 50%. . The research on land reclamation of coal mining subsidence in such areas first attracted the attention of scholars from all walks of life, and many practical reclamation technologies have been produced. None of the methods of reclamation can well solve the contradiction of more people and less land in su...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the silt layer is thick, it is easy to form swamps, and the time for drainage and consolidation is relatively long. The filling and reclamation can only be cultivated after at least two or three years.

In addition, China has carried out silt back embankment work in the lower reaches of the Yellow River for more than 50 years. It has gone through three stages: self-discharging silt, water lifting silt back, and mechanical silt embankment reinforcement. Construction, pumping and silting equipment and pipeline layout, construction of drainage ditches and auxiliary roads in silting areas, dredging and filling of silting areas, drainage and wrapping and roofing, etc., provide technologies for long-distance Yellow River silt filling and reclamation of coal mining subsidence Reference and important basis, but after nearly 40 years of improvement and improvement, the improvement of the Yellow River Diversion Machine silting and embankment reinforcement technology is limited to the improvement of the efficiency of the sand extraction equipment

At present, the main problems in the production of embankment reinforcement at the back of the Yellow River include the low concentration of sand taken by dredgers, the increase in the slurry delivery distance, the decline in production efficiency, the cut-off of the Yellow River, which affects the production of dredgers, and the wrapping and roofing of the silting area. There are many farmlands damaged by excavation, and the distance of silting the back of the Yellow River Diversion and dike reinforcement is generally within 3km (Zheng Wanyong et al., 2003), and the farthest is no more than 12km (Huang Wenfeng et al., 2006), while the long-distance (>30km) Yellow River Diversion filling technology Due to the complex process, high initial investment, and difficult production management, the application in coal mining subsidence areas has not been reported.

Images