Hdi nghi khoa hoc kT thuat md qudc te 2010 Cdng nghiep md tien tien vi su phat triin bin vung BUC NUTJfC, NGAP LO KHI KHAI THAC THAN T R O N G D I E U K I E N P H l T C T A P TS Nguyen Van Chi V i e n[.]
Hdi Cdng nghi nghiep khoa hoc md tien kT thuat tien md qudc vi su phat te - triin 2010 bin vung BUC NUTJfC, NGAP LO KHI KHAI THAC THAN T R O N G DIEU K I E N PHlTC T A P TS Nguyen Van Chi V i e n K h o a hoc C o n g nghe M - T K V I D a t v a n de: D i e n k h a i thac than gan n h u k h o n g tang n h u n g san l u o n g than tang 7,5 lan, (tir 5,7 l e n 43 t r i e u tan), t r o n g sanluong than cap cho n e n k i n h te tana 6.2 lan (tir 4,04 t r i e u tan l e n 25 t r i e u tan), sanluong than xuat k h a u tang 8,4 lan, (tir 2,15 trieu tan len 18 t r i e u tan) cho thay cac m o than da p h a i k h a i dao x u o n g sau nhanh h o n , k h a i thac 16 via, 16 thien nhieu h o n , d d thai cao h o n l a m cho dieu k i e n t h u y dia c o cac m o than cang phuc tap h o n D o l a chua ki den viec n a m 2010 bat dau bang k h o han keo dai, sau la nang nong d i e n r o n g t h i m u a m u a t a i se co cac tran m u a cue I o n va n g u y c o buc nu6c, ngap 16 Quang N i n h tang len I I B u c n u d e m o o n g 16 v i a x u o n g 15 x a y d u n g c o b a n v a c h u a n b i san x u a t D a y l a dang buc nude d i k e m pha h u y cong t r i n h m o gay thiet hai l d n , v i du: M u a tir 25/6 t d i 3/7/1998 la m m l a m sat l d 0 m dat da lap k i n m u o n g thoat nude N u o c m u a chay vao 16 v i a + 1 L o T r i , dang cao, pha t h u n g day buc x u o n g 16 +53 phia d u d i ( h i n h ) D o a n 16 buc co v i chong do, 16 r o n g khoang m L u o n g n u d e buc x u o n g 16 Ion n h i t t d i 0 m / h L u o n g nude m o o n g buc x u o n g k h o a n g 0 m ( h i n h 1) Cot nuoc m u a t i c h dong t r o n g m o o n g k h i buc cao khoang 6 m Tir su co tren cho thay: 3 Hinh Moong lp via +110 sau su co 3/7 lap 140.000 m ddt dd, day tdi muc tu chay Hinh Ban ve H50D-2DC-01-14 dia Dau tu khai thdc ham Id xuong sau 1998 cat qua day lp via, lb +53 - K h a i thac d o n g t h d i 16 thien, 16 v i a ben tren va h a m 16 p h i a d u d i la dieu k i e n can xay buc nude D i e u k i e n d u l a co m u a l d n , m u a l i e n tuc d o n nude vao m o o n g tao ap luc d u l d n pha t h u n g l d p dat da ngan each g i u a day 16 v i a v d i d u d n g 16[1] - Cot nude tdi han moong pha thung vach ngan giua day moong vdi duong 16 X D C B va 16 C B S X p h i a d u d i co t h i d u t i n h theo V D X l e x a t e v : " h Pgh = a K yh-Yih, 636 {1} Hdi Cong nghi nghiep khoa hoc md tien kT thuat tiin mo qudc vi su phat ti - trien 2010 ben vung L T r o n g : P - C o t nuoc t d i han pha t h u n g day m o o n g gh (T/m ) a h - L y e k h a n g cat cua vach n g a n (T/m ) - C h i l u day vach ngan each nude d u k i e n ( m ) y - K h d i l u o n g the t i c h dat da vach ngan K y L (T/m ) - K h d i l u o n g the t i c h cua l d p vach ni>t v o ( T / m ) -Chieu r d n g d u o n g I d (m) t h , - C h i l u cao v d m pha h u y ( m ) t i n h n h u sau : hj = L f / 2f - H e so' k i e n cd' f t i n h theo luc k h a n g nen a f N n h u sau: = G /100 N Khi cot nude du tinh P nhd hon cot nude cd thi tich dong Id via (tinh tdi muc t u chay) t h i can l i p m o o n g hay x a y b i t doan l d d i d u d i day m o o n g p h o n g tranh buc nude gh -Tong luong nude cd thi buc xuong du tinh theo luong nude chua moong tdi mue thoat nude t u chay ( t i n h k h i d i t da sut l d m u a t r o i l i p d u o n g thoat n u d e t u chay) Do ben vach ngan cd t h i nhanh bang bua thir c u n g be t d n g hoac l i y m a u v l t h i nghiem Can cd t u d n g ngan n u d e v a b o m c h i m cho cac d u o n g l d d i d u d i day m o o n g I d v i a I I I B u c v a n g a p 16 cho* t i r n u d e m u a , n u d e m a t : Su co da x a y d n h i l u m d : M u a l d n ( , m m ) 8/8/1995 l a m ngap cac l d cho khai thac t i n g - / L V d m d H a L i m M u a l d n ( , m m ) 29/5/2003 l a m ngap cac Id cho k h a i thac t i n g - / L V d m d K h e Cham T i r cac s u cd tren cho t h i y : -Dieu kien c i n d l x a y s u cd la 16 c h o k h a u than pha hoa toan phan sau (h) nho hon chieu cao v u n g k h e nut dan nude ( H , ^ ^ ) tao cac khe n u t h d l a n t d i b l m a t dia h i n h , tdi day dong k h o i n u d e mat ( h i n h 3, ) ; D i l u k i e n d u la co m u a l d n , m u a l i e n tuc d d n nude ve v i i n g sut l i i n chay qua khe n u t h d (chua b i t l i p ) x u d n g l d c h o p h a hoa K h i l u u luong nude m u a , n u d e m a t chay qua v u n g khe n u t d i n n u d e x u d n g l d c h o l d n h o n l u u luong b o m thoat ra, l d bat dau b i ngap cue b d , r d i ngap m d Hinh D\a hinh ben tren lb cha via 14 khu IV muc -50 Ha Lam nam 1995 m Hinh Trudng hop viing khe nut ddn lan tdi dong, khoi nude mat 637 nude Hdi Cong nghi khoa nghiep hoc md tien kT thuat tien md quoc vi su phat te - trien 2010 ben vung - Co the du tinh chieu cao vung khe nut dan nude (HKNDN) bang khao sat dia hinh noc 16 c h o p h a h o a v a t i n h theo c o n g t h u c t h u c n g h i e m cua T r u n g Quoc: c h i e u cao d o i sap h o n l o a n ( H i ) t i n h n h u sau: ^=±2,5*100X1/(2,1X1+16) Trong do: {2} M -be day via than bi khau , met ±2,5 -he so'kinh nghiem tic thuc tiin khai thdc Chieu cao d d i n u t v d ( H ) t i n h n h u sau: H , = ± 1 , * 0 M / ( , M + 2,1) T r o n g do: ±ll,2-he so du trie tong kit tit thuc tien khai {3} thdc V a chieu cao v u n g khe n u t dan nude d u o c t i n h : HKNDN - C h i e u cao d d i sap H (HKNDN) C O = l H I + H2 d d i khe n u t H {4} hay c h i e u cao v u n g khe n u t dan nude the xac d i n h t a i thuc dia bang cac 16 k h o a n q u a n trac ap l u c , dia nhiet [2] K h i c h i e u cao v u n g k h e n u t dan n u d e H K N D N nho h o n sau k h a i thac cua 16 cho nao t h i 16 c h o co n g u y c o ngap tir n u d e m u a , nude m a t sau k h i p h a hoa ! - L u o n g n u d e chay vao qua v u n g , sut l u n , n u t v d co the d u t i n h theo k h a nang tich dong nude m u a t r e n d i a h i n h v a l u o n g m u a , t a n suat m u a l d n n h a t I V B u c n u d e t i c h d o n g t r o n g k h e n u t , k h o a n g hoc t a c h l d p b e n t r e n 15 cho' p h a hoa T r o n g qua t r i n h d i e u k h i e n s&p da vach, su thap k h d i da v a c h d i d n dong th6i v d i su tach l d p , tao n h i l u l d p b i h dang r i e n g bie)t v d i Gitra v a c h g i a n tiep nhanh chong va phan treo t a m t h o i phat sinh n h u n g k h o a n g hdc tach l d p ( h i n h ) D o da set hut nude t r u o n g n d co the d o n g k i n cac khe nut v u o n g goc v d i m a t l d p , tang su t i c h t u nude khoang hdc tach l d p D d i v d i 16 c h o k h a i thac than, budc tran d £ u tien thay d o i tit vai chuc t d i v a i t r a m met V d i tdc tien guong k h o a n g m / n g a y , t h d i gian t i c h nude khoang hdc tach l d p t d i budc tran d £ u tien vach c o ban k h o a n g t i l v a i tuan t d i vai thang V d i guong 16 c h o d a i hang t r a m m e t t h i d u t i n h tha'm da v a c h rat n h d , t r o n g khoang hdc tach l d p v a n c d the t i c h t u l a i hang t r a m met k h d i nude Su n e n ep dan h o i nude cac khoang hdc tach l d p den t h d i d i e m t h i c h hop se rira t r d i set lap nhet t r o n g cac khe nut va buc vao 16 cho Sau k h i thoat nude t u khoang hdc tach l d p , ap l u c t r o n g d d g i a m d i va dien su t r u o n g n d da set t r o n g cac k h e n u t d d n g hanh v d i su t i c h t u nude cho cac lan buc tiep theo [ ] D i e u k i d n t i c h t u nude va su gia tang ap l u c t r o n g k h o a n g hdc tach l d p phia tren vach g i a n tiep, p h u thuoc vao gdc c a m cua l d p T r o n g the n a m nghieng cua dat da, vach gian tiep c d the t r u o t theo gdc ddc, keo theo su tang d d m d k h e n u t d 16 thuong va co hep l a i d 16 d p l u c t r o n g khoang hdc tach l d p dat gia t r i l d n nhat ( h ^ ) tuc l a bang hi£u sd mire cao k h o a n g hdc tach l d p t r o n g h i n h D i e u d d d i n t d i h i e n t u o n g ddt nude d 16 thuong va buc nude d 16 638 Hoi nghi Cong nghiep r r khoa hoc kT thuat mo quoc te - 2010 mo tien tiin vi su phat trien ben vung Hinh So buc nude tich dong tie ddi khe nut va khoang hoc tach ldp vach Id cha ): 1-Via than; 2-Khoang hoc tach lop; 3-Lop duoi cung vach true tiep; 4-L6 thuong thdng gio; 5-L6 van tai; 6-Vung thoat nude thucmg xuyen tir khoang hdc tich nude f f t * * r N e u g i u a v a c h t r u e tiep ( d d i sap dd h d n loan) v a vach gian tiep ( d d i khe n u t + k h o a n g hdc tach l d p ) l a i cd l d p da m e m t h a m n u d e k e m tao v a c h ngan v a d d i khe n u t + khoang hdc tach l d p l i e n t h d n g t d i be m a t dia h i n h tiep nhan n u d e m u a l i e n tuc n h i e u thi l u o n g n u d e t i c h d o n g tir d i a h i n h t d i l d c h o cd the l e n t d i n h i e u n g a n m e t k h d i D u d i day la m o t v i d u d i e n h i n h : V B u c n u d e t i c h d o n g t r o n g d d i k h e n u t - k h o a n g hoc t a c h l d p t r e n v a c h 16 cho* 65/-35 N g a y 1/10/2009 t a i l d c h o -6S/-35 canh N a m v i a B i n h M i n h x a y buc khoang ngan met k h d i n u d e [ ] V i a cd cau t n i c nep 1dm khep k i n phia, d i e n h u n g m u a r d n g 1,4km ( h i n h ) V d i cau true t h i nude n g f i m t u bdn n g o a i tha'm vao, tir d u d i t r u v i a tha'm x u y e n l e n la k h d n g the v i hd sd t h a m K , t y l u u l u o n g cua da n g u y e n k h d i qua n h d Hinh Tuyen VB cat qua nip lorn theo phuong Dong Tay, rgng khoang 800m r r r V a y t h i b a y n g a n m e t k h d i n u d e buc x u d n g d e n t i r dau? T i c h d o n g d d a u ? X e m mat cat t u y l n V I ( h i n h ) c h o t h a y da v a c h V c a n h D d n g c d cac l d p c u o i san k i t d a y t d i m chay t i r d i a h i n h t d i t a n d a y nep 1dm T u m u c -65 t d i l o v i a , cac 16 c h g v i a sau k h i pha h o a da tao d d i sap d o h d n l o a n va d d i k h e n u t l i d n t h d n g t u v u n g sap d o tdi m a t dat, t r d t h a n h d u o n g d a n n u d e m u a t i r m a t dat x u d n g l d ( h i n h ) K i l m t r a tren d i a h i n h d u n g n h u v a y ! 639 Hoi Cdng nghi khoa nghiep md hoc tien kT thuat tien md qudc vi su phat ti trien - 2010 bin vung Hinh Nu&c mua ngam qua viing sut lun, nut tach tham chay xuong tren vach nut v& sau tich dong Thang 9/2009 la c u o i mua, co l u o n g m u a I o n n h u n g l u o n g n u o c chay vao 16 -75 lai g i a m bat t h u o n g ( h i n h 9) c h u n g to co su t i c h d o n g dau t r e n v a c h 16 c h o -65/-35 [ ] Sau k h i pha hoa toan phan van t n tai m o t « v a c h n g a n » n h u sau: tap da each nu6c tren v a c h (tai L K ) day khoang m , Ion hon c h i e u cao d6i sap h6n loan ( H ! = + m ) k h o a n g + m N h u vay, giua d i sap do" v d i d d i k h e nut c o n m t l d p da each nu6c day k h o a n g + m , u o n v o n g , n u t ne T r o n g mua k h o , nude ngSm van t h a m , chay qua ldp da each nude m o n g va thoat x u d n g 16 cho ( k h o n g t i c h d o n g ) T u y nhien, luong nude n g d m t h a m qua « v a c h n g a n » g i a m dan theo t h d i gian v i cac khe nut ldp each nude b i cac hat cat, set v u n chen lap ddn K h i mua mua t r d l a i , l u o n g nude nga'm xuong nhieu l a m cac hat set v u n t r u o n g n d lap k i n cac khe nut t r o n g l d p each nude m o n g + m 640 Hoi nghi Cdng nghiep 90 80 70 60 "S50 r r khoa hoc ki thuat md qudc te - 2010 md tien tiin vi su phat trien ben viing L u a n g mua tai m o va lugng nude chay vao muc -75 thang nam 2009 I Mua b mo, mm/ngay • Q chay vao -75, m3/h |° 30 20 10 H 1 h ngayl Hinh Luang i I H h I i I 1 h 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 nude chay vao -75 DBM thdng 912009 giam cd mua tdi 307mm Thang 9, l u g n g m u a n g a m x u o n g tang nhanh t r o n g k h i l u g n g nude thoat qua « v a c h n g a n » g i a m d i n l a m m u c nuoc ngim ap luc len l d p each nude m o n g t i c h d o n g t r o n g d d i khe nut tang l e n l i e n tuc gia tang Gay vach cabdn phd thung vach ngdn Id thdi diem xay buc nude: theo tinh toan, budc sap d6 cua da vach c o ban 16 c h g -65/-35 v i a la met K h i 16 c h g da k h a u theo phuong dugc 45 m e t la da v u g t qua g i d i han budc gay cua da vach c o ban Co the, viec gay vach co ban da pha t h u n g vach ngan m o n g - m va tao cac k h e nut l d n t h d n g l e n k h u vuc da vach chua nude cua 16 c h g phia tren (-28/-16) l a m k h d i nude t i c h d o n g t r o n g d d i k h e nut tir -28 t r d l d n buc x u d n g 16 c h g -65/-35 d pham v i dau 16 c h g ( h i n h 10) /Gidi han vung sSp dS 16 cho -28f -16 " - /Gidi han vung sap 66 Id cho -65+ -35 N Hinh 10 Sa nguyen tai lb cha-65/-35 ly tinh budc gay vach ca ban via Ddng Binh Minh Md da khoan LKQT01 xuyen xudng vung sap sau pha hoa va khoan LKQT03 xuyen x u d n g da v a c h n g u y e n k h d i cung ciia v i a each L K Q T k h o a n g 110m Sd l i e u quan trac t a i l d k h o a n vao v a c h V g h i nhan d u g c m u c n u d e n g a m chenh t d i m : 641 Hdi Cong nghi nghiep khoa hoc md tien ki thuat tiin mo quoc vi su phat triin te - 2010 bin viing C6t myc nirfc tinh tai LK01, Lk03 tip 15/6 ten 25/6/2010 30 25 20 15 30 s •55 °5 -5 -Cot MNT-LK03 - Cot MNT-LK01 6/15/2010 6/16/2010 6/17/2010 6/18/2010 6/19/2010 6/20/2010 6/21/2010 6/22/2010 6/23/2010 6/24/2010 6/25/2010 Ng&y quan trAc -10 -15 Hinh 11 Muc nu&c tinh taiLKQTOl vd LKQT03 cung thdi gian chenh tori 32 met V I Ket luan: - H o a t d o n g k h a i thac l a m g i a tang p h i i c tap ciia d i e u k i e n t h u y d i a c o m o dan t o i buc nuoc, ngap 16, n u a c a x i t pha h o n g thiet b i 1 \ «w ^ - B e k i e m soat done thai n u a c n g a m ( h i n h 11), m o i k h o a n g sang biet lap can i t F mi r \ i f nhat m o t 16 k h o a n quan trac n u a c n g a m t r e n vach, t h u n g m u a , v a i d i e m quan trac nu6c chay vao m o K h i l u o n g m u a tang dan, l u o n g n u o c chay vao g i a m dan, m u c nuoc ngam tren v a c h tang l e n t h i l a dau h i e u n u a c t i c h tren v a c h chuan b i buc x u o n g - Can cap nhat cac lat cat qua day 16 v i a , m o o n g 16 t h i e n v a d u t i n h cot nuoc cue dai t r o n g m i i a m u a ; Cap nhat d u o n g 16, 16 c h a l e n cac lat cat, d u t i n h l u c k h a n g cat cua vach ngan de b i e t k h u v u c nao sap x a y buc nuac S f 7f - Can soat d i a h i n h t r e n noc 16 c h g k h a u than co H K N D N < sau k h a i thac de lap nhet cac khe n u t h a , ho sut bang dat set, d a m chat, gat lap cac v i i n g sut l i i n tao m a i doc thoat n u o c t u n h i e n Sau r u n g t r a n m u a I o n ( X > m m / n g a y ) l a i soat d i a h i n h va tiep tuc lap nhet cac khe n u t , ho sut m o i xuat h i e n co the g i a m l u g n g m u a n g a m x u o n g 4-5 lan f f \ i, - K y thuat d u t i n h n u a c chay vao m o , thiet ke thoat n u a c , thao k h o ciing can doi m o i theo k i p the g i o i n h u cong nghe dao 16, k M u than, sang t u y e n than Tdi lieu tham khdo - D i e u k i e n h i n h v a anh h u a n g cua d o n g chay t o i k h a i thac t h a n h a m 16 vung Quang N i n h N g u y e n V a n C h i , n a m 2000 - N g h i e n c u u xac d i n h c h i e u cao v u n g khe n u t dan n u a c ben t r e n cac 16 c h g khau than pha hoa t o a n p h a n Q u a n g N i n h N g u y e n V a n C h i v a n n k , n a m 2009 - B i e n ban d i e u tra t a i nan lao d o n g c h i t n g u o i so / 0 / D D T r 19/3/2010 cua D o a n d i e u tra t a i nan lao d o n g t i n h Quang N i n h - P h u o n g an thao k h o m o T h a n h C o n g , V i e n K H C N M , N g u y e n V a n C h i va nnk, n a m 2010 642 ... n ( H i ) t i n h n h u sau: ^=±2,5*100X1/(2,1X1+16) Trong do: {2} M -be day via than bi khau , met ±2,5 -he so''kinh nghiem tic thuc tiin khai thdc Chieu cao d d i n u t v d ( H ) t i n h n h... , thao k h o ciing can doi m o i theo k i p the g i o i n h u cong nghe dao 16, k M u than, sang t u y e n than Tdi lieu tham khdo - D i e u k i e n h i n h v a anh h u a n g cua d o n g chay... Cham T i r cac s u cd tren cho t h i y : -Dieu kien c i n d l x a y s u cd la 16 c h o k h a u than pha hoa toan phan sau (h) nho hon chieu cao v u n g k h e nut dan nude ( H , ^ ^ ) tao cac