Hauv kev tsim khoom siv hluav taws xob, qhov tseeb ntawm cov laug cam luam tawm (PCBS) yog qhov tseem ceeb heev, vim nws cuam tshuam ncaj qha rau kev teeb tsa cov khoom siv hluav taws xob tom qab thiab kev ua haujlwm ntawm cov voj voog. Thaum siv cov hlau cam khwb cia ib txwm muaj, qhov teeb meem kev co feem ntau ua rau cov qhov PCB hloov pauv, uas tau dhau los ua teeb meem loj uas txwv tsis pub txhim kho qhov tseeb ntawm kev khawb. Lub hauv paus granite, nrog nws cov khoom siv lub cev tshwj xeeb thiab cov txiaj ntsig zoo ntawm cov qauv, muab cov kev daws teeb meem zoo rau qhov teeb meem no.
Lub hauv paus ntawm qhov kev hloov pauv ntawm qhov dej los ntawm kev co ntawm cov hlau cam khwb cia
Lub zaus ntuj ntawm cov khoom siv hlau cam khwb cia yog qhov tsawg heev. Thaum lub sijhawm ua haujlwm ntawm cov khoom siv drilling, tshwj xeeb tshaj yog thaum lub laum laum ceev ceev tig los kov cov hlau ntawv, resonance yuav tshwm sim. Qhov resonance no yuav ua rau lub hauv paus hlau cam khwb cia tsim kev co uas tsis tuaj yeem tsis quav ntsej. Txawm tias qhov me me heev ntawm kev co amplitude yuav raug sib sau ua ke thiab amplified thaum lub sijhawm ua haujlwm drilling meej, thaum kawg ua rau lub laum laum tawm ntawm qhov chaw drilling teeb tsa thawj zaug. Ntxiv mus, qhov kev ua tau zoo ntawm lub hauv paus hlau cam khwb cia yog txwv, ua rau nws nyuaj rau sai sai attenuate lub zog co, ua rau lub sijhawm co ntev dua thiab ua rau qhov degree ntawm borehole offset ntxiv.
Cov yam ntxwv zoo tiv thaiv kev co ntawm lub hauv paus granite
Granite muaj cov khoom zoo heev uas tiv thaiv kev co. Nws cov qauv siv lead ua los ntawm cov pob zeb sab hauv yog me me thiab tuaj yeem nqus thiab siv lub zog co. Thaum cov khoom siv drilling ua haujlwm thiab tsim kev co, lub hauv paus granite tuaj yeem txo qhov loj ntawm kev co hauv lub sijhawm luv luv heev. Kev tshawb fawb qhia tau hais tias qhov piv ntawm kev co ntawm granite yog ntau zaus ntawm cov hlau cam khwb cia. Qhov no txhais tau hais tias nws tuaj yeem hloov feem ntau ntawm lub zog co mus rau hauv lub zog cua sov thiab lwm yam zog hauv ib pliag thiab tshem tawm lawv, yog li ntawd txo qhov cuam tshuam ntawm kev co rau kev ua haujlwm drilling, xyuas kom meej tias lub laum me ntsis tuaj yeem tho qhov ruaj khov raws li txoj kev taug kev, thiab txo qhov tshwm sim ntawm cov xwm txheej offset.
Kev lav phib xaub ntawm kev ruaj khov thiab kev ruaj khov
Lub hauv paus granite kuj muaj kev ruaj khov thiab kev ruaj khov heev. Nws qhov ceev yog qhov siab thiab nws lub zog compressive yog siab dua li ntawm cov hlau cam khwb cia. Thaum lub sijhawm drilling, nws tuaj yeem tiv taus qhov siab loj uas siv los ntawm lub laum me ntsis thiab ntau yam kev ntxhov siab mechanical tsim thaum lub sijhawm ua haujlwm ntawm cov khoom siv, thiab tsis yooj yim rau deformation. Txawm tias nyob rau hauv kev ua haujlwm ntev lossis kev cuam tshuam me me sab nraud, lub hauv paus granite tuaj yeem tswj tau qhov ruaj khov ntawm nws cov qauv thiab muab lub platform txhawb nqa ruaj khov thiab txhim khu kev qha rau cov khoom siv drilling. Qhov kev txhawb nqa ruaj khov no ua kom ntseeg tau tias qhov chaw sib piv ntawm txhua qhov ntawm cov khoom siv drilling tseem meej txhua lub sijhawm, yog li lav qhov tseeb ntawm kev drilling.
Qhov zoo ntawm kev ruaj khov thermal zam kev co ntxiv
Ntxiv rau nws txoj kev tiv thaiv kev co, qhov ruaj khov thermal ntawm granite kuj zoo heev. Thaum lub sijhawm drilling, kev sib txhuam ntawm lub laum thiab daim hlau ua rau muaj cua sov, thiab kev ua haujlwm ntawm cov khoom siv kuj tuaj yeem ua rau qhov kub hauv zos nce ntxiv. Lub hauv paus hlau cam khwb cia raug cuam tshuam los ntawm kev hloov pauv kub. Kev nthuav dav thermal thiab kev cog lus tuaj yeem ua rau muaj kev hloov pauv thiab kev co ntxiv, uas cuam tshuam rau qhov tseeb ntawm drilling. Tus coefficient ntawm thermal expansion ntawm granite yog qis heev. Thaum qhov kub hloov pauv, nws cov kev hloov pauv loj yuav luag tsis quav ntsej. Qhov no zam kev co ntxiv los ntawm thermal deformation, tsim kom muaj ib puag ncig ua haujlwm ruaj khov dua rau kev ua haujlwm drilling, thiab txo qhov ua tau ntawm kev drilling offset.
Hauv kev nrhiav kev ua haujlwm drilling PCB siab, lub hauv paus granite, nrog nws txoj kev tiv thaiv kev co zoo heev, kev ruaj khov siab, kev ruaj khov siab thiab kev ruaj khov thermal zoo heev, daws tau qhov teeb meem drilling offset los ntawm kev co hlau cam khwb cia los ntawm ntau yam. Nws muab kev txhawb nqa txhim khu kev qha dua rau cov khoom siv drilling PCB, pab kev lag luam tsim khoom siv hluav taws xob tsim cov ntawv luam tawm zoo dua, thiab txhawb kom tag nrho kev lag luam txhim kho mus rau hauv qhov kev taw qhia meej dua thiab siab dua.
Lub sijhawm tshaj tawm: Tsib Hlis-22-2025