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某铁矿矿柱回采安全性研究
2014-09-12
某铁矿二采区一中段采用空场采矿法进行采矿,经过多年开采该中段未处理采空区体积 已经达到40万 m3,遗留矿柱矿量超过26万t,为了充分回收矿产资源矿山计划回采矿柱。由于现场未处理 的采空区体积较大,而矿 柱又是维持采空区稳定性的关键要素,可能部分矿柱的回采或破坏就会诱发一定规模的地压活动 ,威胁矿山的正常 安全生产。所以在矿柱回采之前,对回采区域的矿柱进行安全性研究,可以指导矿柱回采的实施 ,进而保障矿柱的正 常安全回采。结合矿山的现场实际情况,以应力增量理论为基础,采用工程地质调查、室内试验 结合数值模拟的方法, 对矿山二采区一中段需回采矿柱的安全性进...
Series No 458ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ Augustꢀ 2014 !ꢀ ꢀ "ꢀ ꢀ #ꢀ ꢀ $ 20%14&(4&588'' ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ METAL MINE ’ )CC_EF!,cNO 1 2 3 3 4 9`Æ 9 ö÷ ꢀ / ꢀ Þ ꢀ ×øž ꢀ ùúF ꢀ ( 1. ©É#ك„2, :; ¯Ø 730900; 2. `©­0-.ÎÏ㫬01.2, `© ,é 341000; 3 . yi;VÙ!™šƒ„2;]^_, € yi 410011; 4 yi#$ƒ„2;]ÆÇ^_, € yi 410012) - ꢀ .ꢀ 2C#핲¥ù•<¿¾•#ÉGH•#, ?ºK;•·ùvJɕ¿²§‘\?#— 40 þ m3 , dÞ#;#bz 26 þ t, ¯X÷Vf#߀0#"“{f•#;。 .SÁ¾vJÉP•¿²§‘·, ‰# ; àH5­•¿²¡©ÑPqW‹Ñ, áa«V#;Pf•Fnóæ°ꢀó¥©esPÜ&¶ž, ÊË#"På½ Êꢁ8ß。 {â\#;f•XE, Af•²ꢀP#;GHÊꢁÑ67, áâz9#;f•Pêj, G‰N!#;På Êꢁf•。 T±#"PÁ¾ê4jk, â;š¥bÉç¯'*, •<,ÞÜßïG、 6­=>T±{ísöPºÉ, A#"핲¥ùúf•#;PÊꢁÑGH67, ¢©Xqf•#;PÊꢁr{‡ˆ。 67TUª¦#"핲 ½ ¥ ùP#;JSÊꢁMŸ, áâGH«V#;f。 / 01ꢀ 4'w­tꢀ ¥¦§¨ꢀ #Õ¡ebc’ ꢀ ꢀ 23456ꢀ TD853 391ꢀ ꢀ 789:;ꢀ Aꢀ ꢀ 7<=6ꢀ 10011250( 2014) 0816204 Stability of Pillars Recovery in an Iron Ore 1 2 3 3 4 Liu Wutuan ꢀ Zhao Kui ꢀ Hu Jingtao ꢀ Rao Zhaoxun ꢀ Liu Mingrong ( 1. Northwest Institute of Mining & Metallurgy, Baiyin 730900, China; 2. Jiangxi University of Science and Technology, Ganzhou 341000, China; 3. Changsha Engineering and Research Institute Ltd. of Nonferrous Metallurgy, Changsha 410011, China; 4. Changsha Institute of Mining Research Co. , Ltd. , Changsha 410012, China) Abstractꢀ The open stope mining method was adopted in the first section of No. 2 mining area in an Iron Mine. The un 3 treated goaf has reached 400, 000 m and the ore quantity of remained pillar is nearly more than 26 million tons after years of exploitation. In order to fully recover the mineral resources, the mine is planning to recover the pillars. As the untreated mined out area is large and the remained pillar is the key support for maintaining the stability of minedout area, the recovery or de stroy of part of pillars may induce a certain scale of ground pressure activities which will threaten normal safe production of mine. So before the pillar stoping, the research on security of pillar mining area can guide the implementation of the pillar sto ping, and ensure the pillar mining in safety. Combining with the actual situation in an iron mine and based on the theory of stress increment, the combination of engineering geological investigation, laboratory test with numerical simulation is adopted to research the pillar′s security about the first section in No. 2 mining area and to determine the safety factor of each pillar. The research results showed that the pillars in the first section of No. 2 mining area is in safety, and parts of pillars can be recov ered. Keywordsꢀ Stress increment theory, Numerical simulation, Pillar recovery secutity ꢀ ꢀ ⿾•#É;•PÜO(¡#", \;•Þ e¿f•#´$tjf•#;, ¤#´f•„¤â ?‹_<, áa«V#;Pf•FZnóæ°9ĕ ¾ó8dÿ、 Ò2ÃÜ&+Á, Š¿ꢀó¥©esP Ü&¶ž±ÇMÈ、 µßPo, ÒÓ#"På½Ê ꢁ8ß, {â#;Pf•IJS#"å½P#D; •, ¸\©Î‡P£€, ÊꢁSðH€0fÝ<e ‹~PÔÑ, ™HÒÓ`aI¼ÝfPqWS ð[ 47] 。 \#;f•XE, Af•²ꢀP#;GHÊ  t, æ°dÞO‡bP#;g•¿²[ 12] , ¤hdÞO P#;ßH‹cP#߀0, A#;GHf•I„á âÅ#߀0ü—õ÷VÝ<, ‰Š–áâuꢀ>d P?tƒu, È5#"P8ßÄ~KÛ[ 3] 。 8H. S#;H•¾P?‹k?«š, A•¾P¡©Ñ¬© ! "#$ꢀ 20140511 ) *+,ꢀ Z3C( 1969— ) , 0, ꢀØ,Þ:。 · 162· ꢀ ꢀ ꢀ °©XE: PL##Õ¡ebc’ƒ„ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 2014 (& 8 ' ꢀ ½ # ² Ñ67, áâz9#;f•Pêj, N!#;På Êꢀf•[ 810] 。 2C#핲¥ù•<¿¾• ÉGH•#, ?ºK;•ÞO‡b#;g•¿ Ž, K ¯#;;š–r{, MPa; σ ¯h#;f 0 •E#;;š, MPa; σ ¯#;íAf•h#;; 1 š¥b, MPa。 1 3ꢀ ÑB´µ½"ñp}Ä ꢀER“zü—P#;yLíp#;rú;š , ›gïGTU, ·ùvJɕ¿²§‘ꢀ7 40 3 þ m , dÞ#;#b‹¯ 26 6 þ t, `‹;{•” Ÿ ڇ¯ 17 2 þ t。 *E·ù•#\\7°À, ‰ íù–\GH'l, ÔÕ, GH#;f•ÊꢀÑ6 A#"Êꢀ­u8ßg€0÷VÝ<¦‚?‹P íGH”Î, `”í_¯˜b#;ÊꢀчˆPz ¨, ÔՙݯÊꢀr{ S 12] [ 。 7 0. 64 + 0. 36 ω σp1 ( ) h èé。 S = ( 6) Kσ + σ 0 1 1 ꢀ ÑB´µ½"ñp}Ä  1ꢀ ÑBm] ÒÓ#;yLPÔт¹º, /‹-.#;P‡ 、 H×»¼、 #;F§PÜߣ±Ã, îAIJPj ꢀ ꢀ S < 1 |Á¾A;P#;3?nó, S > 2 |Á¾ 1 A;P#;¤„L, {âáâꢀ#;Êꢀr{p# ; ¡ > ÊꢀÑÃØ{V¯ 3 PÃØ: S < 1 |, #;¡SI ©Ø|; S qS 1 ~ 2 |, #;¡SÃ¡©Ø|; S 2 |, #;¡S¡©Ø|。 ˆ kMN, !­ñ67&Z\?uvX¬º“z#;y LP¼Ž, `;<Ú¯ñæPH. Bieniawski uv [ 11] â;š¥bÉç¯'*“9vPf•#;Êꢀ P#;yL¼Ž : r{“z¼Ž, I„‡±~—XF§T£(%、 ¨ F;š、 ÃÔÑA#;¡©ÑPÒÓ, ‰Š–~X íAf•A#;;šPw‡jk, ÔՕ<·ºÉG H#"f•Þ#;¡©ÑꢀªVWꢀõ¯áË。 ω σp = σp1 0. 64 + 0. 36 , ( 1) ( ) h Ž # , σ ¯#;PyL, MPa; σ ¯]ꢁ”¯ 1 |P p p1 ;yL, MPa; ω、 h V|¯#;P]L、 ꢁL, m。 2 ꢀ ÃÄ°rxy Ž ( 1) H~X#;ÆMÔåP?>¼Ž, –$ • <¨šòjP[ÛòjÉ, A핲¥ùú \ £  ?ヲ‚œªÑ, 8Hǂ~—JÉÃF§T (ÑÔÑ。 ¯XꢀJÉA#;yL σp1 PÒÓ~ G", T±#"Pê4jkÊ;<Pð¶, •< f#;P²ꢀGHX[ÛP,ÞÜßïG。 ýA ïGBiÿ 33 Pj), [ÛklX¤hj)PT£ RYt、 ßMʵ, ?VW¤h{gŠµü—T£ R/‹(%Êef: ①·ù‡tT£R¹ä, ªã ù#;f•²ꢀ“ù¹”Î0, F§P¡©Ñ”Î L; ②·ùJÉ»Ñóô¯T£R, tÖ¯ 30° ~ Hoek - Brown ºÉ“zJɽÀA#;yLPÒÓ: σ = sσ , ( 2) p1 槡 c Ž , σ ¯„_FDP$%}&yL, MPa; s ¯F§ c „ _Ñ&b<ê>½{。 5 0°PT£R• 50% â+, ä{tÖÎOFÎM。 s = exp( RMR - 100), ( AóžF§) ( 3) ( 4) 핲¥ù/‹#;‚ 5 P, ֜ 1 {, ` 6  hÞ 3 ,#;_¯®¯Ñ#;IGHf, `â 4 RMR - 100) ( AvóžF§) s = exp( 9 P#;ꢀ«GHf。 A 1 ,、 2 ,#;g 4 ,、 5 , #;‰¯, `fP¼oHAú˜P, 8H.S/ å>=©#"PuŸ[ꢁt~, ¯X¢N·/åPÊ ꢀ, {â#;Pf•¿t¼onA¯ 5 ,#;、 4 , #;、 2 ,#;、 1 ,#;。 1  2ꢀ ÑBVWXØ ‚ ’“z#;rú;šP“zºÉ‚R‘V7 É、 ;ŽÇÉ、 ^]r{ÉÃ, ¤hºÉßǂ~Ü š¾A#;;šPÒÓ_<。 ½ꢀ¤h¼Ž;< S•<´;É;•P#§tÖΈP#", 8Hòê ; 4 P,Þ;<ª¦, ¤hºÉ“zfüP#;rú; í, ‚|‹00Mùê4jk。 p‚’“z#;rú;šPºÉ”, ÖUâ# ¨F;šjbgA8;šŒj¯'*, jT±{í š " söPTUgYâ#"P?>, ¡æáâ”ÎN¢ P¢©#;;š–r{, ¤:füP#;rú;š 홋õ¯N¢, #;rú;š 3 1ꢀ ÑB4e3 σ = Kσ0 + σ1 , ( 5) Fig. 1ꢀ Pillar distribution · 163· % & 458 'ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ !ꢀ ꢀ "ꢀ ꢀ #ꢀ ꢀ $ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 2014 (& 8 ' 3 ꢀ uÂÊr 4ꢀ ÑB=‚‰¶4M 3  1ꢀ uÂkÝÊË 4 1ꢀ %ütuɵ ‡ ±~“zõLP‹ÊâÊ}$ƒ;, lm5 ( 1) #;PÆMp{-.#;Prú5L l、 r ú]L ω âÊrúꢀL h, ‡±Á¾ïGâÊ#ºu -P{g€[, ü—핲¥ù#;rú5L、 # ;rú]LâÊ#;rúꢀLP{gÖª 1 {。 9 03 m、 ] 347 m、 ꢀ 115 m P5º§“zst, _P stJ){¯ 82 545 P, ¸R§$G{ 467 207 P, st֜ 2、 œ 3 {。 @ 1ꢀ |‚âG2¾æÑB%ütu Table 1ꢀ The basic parameters of pillars at the first section of No. 2 mining area m l h ω 3 2ꢀ ³EÑÒÊË3 Fig. 2ꢀ Model of surrounding rock and orebody # ;+, 1 , 39 52 28 75 29 42 40 64 42 98 35 38 47 40 7 46 7 35 7 33 7 39 7 51 2 3 4 5 , , , , 35 35 ꢀ ꢀ ( 2) ›g6­GHP#F'ýš&p{=>T 3 3ꢀ ÑB、 ÑCÞ߯4 U, ü—#DP}&yL σ ¯ 89 21 MPa。 ›g#" c Fig. 3ꢀ Mesh partition of pillar and chamber , ÞÜßïGPTU, •<F§ RMR íP“zºÉ, 3  2ꢀ uÂkÝKL ü—F§ RMR í¯ 83, A·F§PßbÃد Ⅰ Ø, ꢀF§ RMR 휆“z¼Ž, s = 0 114 6, ü 3D < FLAC ‚Û‘VëNAstGH“z, e • ¿ AstjcœD;š¾, $tj;†stꢁ«# , Útĝ#;Pf•¼o;†ú‹f•P#;, klqP0ù#;P;š{gg“zTU。 «VT U֜ 4 ~ œ 6 {。 — #;]ꢀ”¯ 1 |PyL σ ¯ 22 3 MPa。 p1 ´ ( 3) h#;f•E#;P;š/‹-. 2 P « ; ; V, VH\F§v;†óžXEϗP¨F š, îí«VHÔF§、 #´;†ÃÅ#;ϗP š¥b。 .S#"ǂqPÜ;šjb€[, ™ ǂ;šŒjr’, {â2\Ý<{ísöPTUe ¢ ©h#;f•E#;;š σ g#;íAf• 0 h#;;š¥b σ , Öª 2、 ª 3 {。 1 ( 4) ›g{í“zTUâÊT±‡b#"‚q 3 4ꢀ ÑC=‚ÐXØO3 € #  [, •¾;†#;;š–r{¥¯ 2 ~ 3, ›g "Pê4jk, 9û#;ÊꢁѓzP#;;š– r{¯ 2 5。 Fig. 4ꢀ Stress nephogram after stoping of chamber @ 2ꢀ ÑC=‚ÐÑBXØ Table 2ꢀ Stress of pillars after roof's recovery MPa # ;¨ #´f•t#; h#;f• # ;+, F;š ;š¥b E#;;š 3 5ꢀ 4 6、 5 6ÑB=‚ÐXØO3 1 2 3 4 5 , , , , , 2 13 2 07 2 09 2 10 2 17 1 18 0 99 0 73 1 31 0 66 3 31 3 06 2 82 3 41 2 83 Fig. 5ꢀ Stress nephogram after stoping of 4 and 5# pillars # 4  2ꢀ ÑB‰¶[u › g#;Êꢁr{“zP¨É, ꢀ+«¢©P' 3 6ꢀ ÑB¶e=‚ÐXØO3 ýp{, œ†—#;¡©ûÛMŸºÞ“zv;# Fig. 6ꢀ Stress nephogram after stoping of all pillars PÊꢁr{ ü—핲¥ùq#;PÊꢁr{ , ; Öª 4 {。 · 164· ° ©XE PL##Õ¡ebc’ƒ„ (& ' @ 3ꢀ ÑB|å=‚§¿ÑBXØÉQ Table 3ꢀ The stress increment of the adjacent pillars in second pillars recovery Ê $ ¿¾É•¾eÞ#§f,_Pêë !#d , # ,# ;f• ;f• t;š t;š ,# ;f• t;š ,# ;f• t;š #;íA f•h #;;š # ; + , ¥ b Ê $ W ‹ ¿¾É•¾eÞ#§f,_Pêë # , , , , f• J,Þ \ f• f• „ ¤ ZWy ¦y- 9½» à ¿¾É#;nóefÊ¡©ÑV W •#pÊꢀ,Þ&X \ f• \f• „¤ f• „ ¤ \ f• \f• „¤ \f• „¤ , f• „ ¤ @ 4ꢀ |‚âG2¾ÑB‰¶[u Lt¦ ´;ÉÜ&JÉÊM,#;T£p{67 ³´ Table 4ꢀ The safety coefficients of pillars — ¶É,‡& in first section of No. 2 mining area # ;+, , , , , , Êꢀr{ S 7 ²9 )rÜ ¿¾É\¡lÑΑ#§P;< ‚S 4  3ꢀ ÑB‰¶4M # " # ;Êꢀr{“zTUª¦ 핲¥ùP# ; Êꢀr{߇S A{‚#;\#;f•PÞ ßJSÊꢀMŸ g{VP#;ÊꢀÑÃØ í•²¥ùP# ÊꢀÑÞL/‹HE¡S¡lÃØ ÿ‚ ,#; ,#;HE¡SÃ¡lÃØ a é tôž (Ëõ à Þ#É#;f•¡©Ñ“zºÉ ‚S(¡ #"«V  Ê`,Þ;< › ; g a é Vْ ·[¸ à 2(#eÞ#;f•P¡©Ñ6 ‚S(¡ #"«V 5 ꢀ Kꢀ y *E #"\?Êꢀf•X핲¥ùP ,#; \#;f•„âtǂó8Ü&¶ ^Š`€v•#;™¹„L 핲¥ùP#;Êꢀr{߇S ‚#;\#;f•PÞßJSÊꢀMŸ áâ 7 , g ž A ZMp <Y5{í“zºÉ¢©#;f•Pڏºk | :‚S(¡ { GH«V#;f• fJ‹cyÜ&Œj T±#;f•ê몦 ý67{<P'S š¥bÉç67#;¡©ÑPºÉHáHP áâ SVW#;PÊꢀÑ z9#;f•ºkPêjà ºR ; - ԏ #;yLP•òÒÓÔÑ FDš&p,Þ&X < t z 7 8 UY‡ g› /rn DÌ#•¿²¡©Ñ/‹ÒÓÔÑå =>67 #d67p;ó ^ [ä Áœ•#ø[ <X J(,dvHI Z ª ‡„"ꢀ##;f•x67 j¦ j¦É,‡ st+u MRS &
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