KHOA HOC VA CONG NGHE MO<br />
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CAC BIEN PHAP NANG CAO HIEU QUA LANG DONG<br />
HAT RAN TRONG BAI XUTLY NUOC THAI KHAI THAC MO<br />
KS. PHAM VAN CHINH - Cdng ty CPTVDT Mo vd Cdng nghiep-TKV<br />
KS. N G U Y I N T U A N THANH - TrUdng Dai hpc Mo-Dja chat<br />
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K<br />
hai thac md ( d Id thien va ham 16) ndi chung cao vi SLf bdi lang biin da't trUde tUdng chan hoac<br />
dac biet la khai thac, rifa, tuyen quang sa hd tieu nang khi xa rat nhanh, vi tri tudng lang ludn<br />
khoang deu lam phat sinh, d nhiem ngudn bi thay ddi, hoac phai lien tuc nao vet.<br />
nude. De bao ve mdi trudng viing md. mdt van de 2.2 Cae giai phap nang cao hieu qua lang<br />
ca'p thiet la phai thu gom, x(i ly lupng nudc thai a. Thay ddi chieu rpng cua bai lang<br />
trong qua trinh khai thac, che bien khoang san dat Trong mpi trUdng hpp, khi xay dUng bai lang.<br />
chat lu'png trudc khi xa, thai vao mdi trUdng. theo dieu kien ling tdi Uu, chieu rpng bai lang can<br />
1. Nhufng yeu tdanh hudng den qua trinh lang thoa man bieu thUe sau;<br />
lg=(2.lo-Bb), m. (1)<br />
Qua trinh lang dUdc dac trUng bdi hai yeu td<br />
Trong dd; IQ - Chieu dai lang toan bp ed hat trong<br />
chfnh la tdc dp ling (W) va quang dudng lang (L).<br />
ddng nUde thai, m: Ig - Vj tri dat cifa gieng thoat<br />
Nhu'ng yeu td anh hUdng den tdc dp ling (W) va<br />
nudc tfnh tU cifa xa, m.<br />
quang dudng ling (L) la dac tfnh cd ly, cd hat, nhiet<br />
Nhu vay chieu rdng bai lang cang Idn thi chieu<br />
dp, dp nhdt mdi trUdng... dac biet la tdc dp ban dau<br />
dai ciia bai ling cang giam nhung phan Idn cac d p<br />
(Vo) va tdc dp cudi (vJ ciia ddng nudc thai.<br />
hat van dupe lang dpng va giCf lai trong bai.<br />
2. Cac bien phap nang cao hieu qua ldng b. Tang chieu dai lang L<br />
Rat nhieu trUdng hdp chieu dai lang (L) ciia bai<br />
2.1 Cac giai phap nhdm giam Vo<br />
lang khdng the thay ddi dupe vi dieu kien thuc te<br />
Viec giam VQ trong eac dudng dng day, hoac<br />
md. Vi vay d n ap dung mdt so phUdng phap nham<br />
mang dan la khdng the vi lam lang dpng cac hat<br />
tang chilu dai vd hieu qua lang cua cac cd hat<br />
ran Id lifng va tieu hao nang lUpng trong qua trinh<br />
trong bai ling nhu sau;<br />
van chuyen. De giam Vo d n ap dung cac phUdng<br />