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Where applicable
In open cast mining, over burden dumps erode highly by rainwater and pollutes the surrounding with the spoils. Normal vegetation on the slopes takes long time and to quicken the process geotextiles are applied. Jute geotextiles
are in use for over 50 years in the developed countries and in India the
Coal Fields have started their application recently.
Products applied
Open mesh woven geotextiles of BGW 500
& 730 are commonly used for stabilization, specification of which are given in
Slope Protection &
Vegetation.
Why applied
The surface of the heaps is not fertile as a result accumulation of
soil with nutrient takes time. Again good soil when placed on the slopes
is washed away by rain water and vegetation can not grow. The open
mesh fabrics hold the good soil and allow the seeds to grow quickly and
stop pollution.
How to apply
The methods have been discussed in
Slope Protection &
Vegetation and
in the plan below. However, in this field of application care should be taken to reduce the
slope with the help of flexible gabion walls to be constructed at intervals of suitable distance,
particularly for the mines on hills.
If the soil is of poor fertility, good soil with manure may be spread over the slope and thereafter geotextiles may be applied to achieve quick result otherwise
good soil may be dumped at places for plantation of deep-rooted trees. Arrangement
of irrigation at least for two seasons in dry areas is recommended for
quick action.
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