Thong tin khoa hoc cong nghe mo MM A^ket qud NGHIEN CLTU QUA TRINH PHONG HOA DAT DA bd tru Via 4 mo than IVa Dvfdng Mining activities have always created empty spaces destroying the natural stress equ[.]
Thong tin khoa hoc cong nghe m o MM A^ket qud NGHIEN CLTU QUA TRINH PHONG HOA DAT DA bd t r u Via m o t h a n IVa Dvfdng Mining activities have always created empty spaces destroying the natural stress equilibrium in rock masses and causing rock displacement One of the reasons causing pit slope failures iS the rock weathering process The paper represents some initial research results from rock weathering process at slope V4 of Na Duong coal mine Cdng tac khai khoang tao nen cac khoang trdng, lam m i t the can bang t a nhien cua ang suit khdi da, gay nen cac hien tap'ng djch chuyen, bien dang dat da Trong cac nguyen nhan gay nen qua trinh trapl Id bd md thi qua trinh phong hoa la mpt nhang tac nhan dd Trong nhang nam g i n day, Vipn Khoa hpc Cdng nghp Md -Vinacomin da tien hanh nghien cau qua trinh phong hda be mat bd trg via md than Na Du'ong va da thu du'p'c ket qua ban dau K i t qua xac djnh c h i l u day dd'i phong hda De xac djnh chieu day cua ddi phong hda tren bd trg via 4, da tien hanh dao hd dao, vj tri tpa dp cac hd dao the hipn bang Dja t i n g cac hd dao t a tren xuong dadi bao gdm Idp da set ket chieu day ta 0,3m den 0,9m, Idp bdt ket chieu day 0,2m den 0,4m, Idp cat ket chieu day ta 0,2m den 0,3m Tai cac hd dao, tien hanh l i y m i u thi nghipm xac djnh phan hda hpc cua da, dac tnjng dp ben cua da theo thdi gian va theo dp sau T a cac hd dao cho thiy, dat da md than Na Daong rat phac tap, da KS D KIEN cad'NG KS NGUYEN HOU KUAN Vign Khoa hgc Cdng nghg Md-Vinacomin taong ddi mem yeu, chieu day nhd lien tgc xen kep nhau, da set chiem khoang 60% dja tang Qua trinh nghien cau da cho cac ket qua nhu' sau: a) Nghien cau dp ben cua da theo chieu sau va theo thdi gian (bang 2, bang 3) Bing Vj tri ba ho dao X Y Z Ho dao 2400695 471561 +275 Kich thu'ac (sau, dai, rong) met 1,2x3,8x1,2 Ho dao 2400558 471267 +288 1,2x3,5x1,3 Ho dao 2400729 471406 +285 1,3x3,2x1,3 Tpa dp STT Bing Ket qui nghien cUu dgc trwng dg ben cua da theo dgsau Chieu sau H61(m) 0,3 0,6 0,9 Chieu sau Hd2 (m) 0,3 0,6 0,9 Dg b i n dac trirng cua da set k i t hd dao sd Dg ben Khdi lu'p'ng Goc ma sat Lu>c dinh " k i t e (p nen On t h i tich Y (Kg/cm') (Kg/cm^) (g/cm^) (dp) 45,7 1,56 16"34 6,0 9,4 54,6 1,65 18"21 12,4 86,2 1,79 21 "23 Do b i n dac tru'ng cua da set k i t hd dao sd Dp b i n nen an (Kg/cm^) Khdi lu'p'ng t h i tich Y (g/cm') 39,8 54,5 80,9 1,51 1.67 1,75 dinh "kite (Kg/cm^) LLPC 5,7 9,6 11,4 Goc ma sat (p ( do) 15^35 17"23 20''23 Dp b i n dac tru'ng cua da set k i t hd dao sd Chilu sau Hd3 (m) Do b i n nen On (Kg/cm'') Khdi lu'ang t h i tich Y (g/cm') Lipc dinh "kite (Kg/cm^) Goc ma sat cp (dp) 0,3 0,6 0,9 47,8 57,4 89,2 1,57 1,69 1,81 6,1 9,8 12,5 16"34 18''23 21 "24' KHCNM S6 1+2/2011* DIA CO MO CO CVJ n ^ co" co" CD 00 m oo" oo" CM CM Oi r»: csi Thdi gian nghien cUu (thdng) Ho ddo c :5 c I u Thdi gian nghien cUu (thdng) U Ho ddo Q> CM CO CM fO in m 00 ^r" CM in m" CM co" CM oo co_ h>." " • * in CM CO co_ CM (D m o" o en" in oo" a> m" CM m O) (D CM 29,4 m 00 CM co" CM" CO CM' 00 h-" CM CO o CD CM cd "CM CO o O CO in" "in CO o CD CM 00 m o CM CM" in "in CM" o 00 CN CO h-" CO in CM" o CO o h-" CM o" CM CM oo" CM" CO O CD CM CM' in 'o'CM CO CM CD in O CD CO CM" o LO CM CM CD CM" CM" in O CM CD CTT CM' m oo" CO CM CM' CM -sl-" CD CM o" CO "in o "in 2,01 in 14,8 m m "in o 180,9 4,2 (O 1,29 o> 5,2 21,5 Thai gian nghien ciru (thdng) Ho dao Thong tin khoa hoc cong nghe m o CM 00 CO oo' CM in CM' in CM o - en CM 00 CM CD" CO CM CM" CM o o o CO CM TO o" m CM CM" CO CM CD in CD" CO CM' o CO >ra ão ôĐU CP «.( IS E E Chi tieu c :S •c c CM ,.