Imephu Yesakhiwo Esingaphansi Komhlaba nge-GPR
Ukumapha izakhiwo ezingaphansi komhlaba kuyisidingo esibalulekile emikhakheni eyahlukene, kusukela kubunjiniyela bezokwakha kanye ne-geology kuya ekuvubukulweni kwezinto zakudala kanye nokunciphisa izinhlekelele. Lesi sidingo sivela ngoba izinqumo eziningi zokuthuthukiswa kanye nocwaningo zincike ezimweni ezingabonakali ebusweni, njengokuba khona kwezinsiza ezifihliwe, izingqimba zomhlabathi, imigodi, imifantu, noma izinto ezithile. Enye indlela esetshenziswa kabanzi "yokubona" ngaphansi komhlaba ngaphandle kokumba yi-Ground Penetrating Radar (GPR). Lobu buchwepheshe bubhekwa njengobusebenzayo ngoba abubhubhisi, bushesha kakhulu, futhi buyakwazi ukukhiqiza izithombe ezingaphansi komhlaba ngesisombululo esihle ngaphansi kwezimo ezithile.
Kuyini i-GPR?
I-GPR iyindlela ye-geophysical esebenzisa amaza kagesi asebenza ngesivinini esiphezulu ukuthola ukwehluka kwezinto ezingaphansi komhlaba. Kalula nje, idivayisi ye-GPR ikhipha amaza kagesi asebenzisa i-antenna edluliselayo emhlabathini. Lapho lawa maza efika emngceleni phakathi kwezinto ezinezakhiwo zikagesi ezahlukene—isibonelo, ukuguquka kusuka odakeni kuya esihlabathini, noma kusuka enhlabathini kuya epayipini lensimbi—amanye amandla amaza abonakala emuva ku-antenna etholayo. Lesi siginali esibonakalayo siqoshwa njengedatha yesikhathi sokuhamba ngezindlela ezimbili. Kusukela kule datha, kwakhiwa izincazelo mayelana nokujula kanye nesimo sezakhiwo ezingaphansi komhlaba.
Izimiso zokusebenza kanye nemiqondo eyisisekelo
Isihluthulelo sokuhumusha i-GPR ukuqonda ukuthi ijubane lokusabalala kwamagagasi kagesi lithintwa ukuvumela kwe-dielectric kwezinto. Izinto ezinokuqukethwe kwamanzi amaningi ngokuvamile zivumela okuphezulu, okuholela ekusabalaleni kwamagagasi okuhamba kancane kanye nokuncipha okukhulu. Ngakho-ke, i-GPR ngokuvamile isebenza kahle ezintweni ezomile njengesihlabathi esomile, ukhonkolo, noma amatshe athile, kodwa inganqunyelwa odakeni olumanzi noluhambisa amanzi.
Idatha ye-GPR ivame ukuboniswa njenge-radargram, isigaba esiphindwe kabili esibonisa ukubonakaliswa ngokuhamba kwesikhathi noma ukujula. Izinto ezifana namapayipi noma amatshe zingakhiqiza amaphethini e-hyperbolic ku-radargram, kuyilapho imingcele yezendlalelo ivame ukubonakala njengokubonakaliswa okuhambisanayo nokuqhubekayo.
Ukucushwa kwamathuluzi kanye nohlobo lwe-antenna
I-GPR iqukethe iyunithi yokulawula, i-antenna, uhlelo lokuqopha idatha, kanye nesofthiwe yokucubungula. I-antenna iyisici esibalulekile ngoba inquma ukujula nokuxazulula kokungena. Ngokuvamile, imvamisa ye-antenna ephezulu ikhiqiza ukucaca okungcono kodwa ukungena okungajulile, kuyilapho imvamisa ephansi ivumela ukungena okujulile kodwa kunciphisa imininingwane.
Njengomfanekiso:
– Ama-antenna angu-1000 MHz avame ukusetshenziselwa ukuhlola ukhonkolo, efuna i-rebar noma izikhala ezingajulile.
– Ama-antenna angu-400–500 MHz avamile ekusetshenzisweni noma ekudwebeni imephu yezendlalelo ezingajulile.
– Ama-antenna angu-100–200 MHz asetshenziselwa uphenyo olujulile njenge-stratigraphy engajulile noma ukufuna imigodi emikhulu.
Ukukhethwa kwe-antenna kumele kulungiswe kuye ngokuthi inhloso, uhlobo lwezinto ezibonakalayo, kanye nezimo zensimu.
Izigaba zokuhlola ze-GPR zokudweba imephu engaphansi komhlaba
Ukudweba imephu yezakhiwo ezingaphansi komhlaba nge-GPR kuvame ukulandela izigaba ezihlelekile ukuze imiphumela ibalwe.
1. Ukuhlela ucwaningo
Isigaba sokuqala sihilela ukunquma umgomo wokuhlola: ukuthi ngabe ukusesha amapayipi, ukujiya kwendlela, imigodi ngaphansi kwemigwaqo, noma izakhiwo ezithile ze-geological. Ngokusekelwe kulo mgomo, indawo yokuhlola, indlela yomzila, isikhala segridi, kanye nemvamisa ye-antenna kuyanqunywa. Ukuqoqa ulwazi lokuqala olufana namamephu okusetshenziswa, izinhlobo zenhlabathi, kanye nomlando wendawo nakho kuyasiza.
2. Ukutholwa kwedatha yasensimini
Ukuthola kwenziwa ngokuhambisa i-antenna phezu kobuso ngokulandela indlela ehleliwe. Indawo yendlela ingaphawulwa nge-tape measure, i-odometer, i-GPS, noma isiteshi esiphelele ukuze kuthuthukiswe ukunemba kwendawo. Isivinini sokunyakaza kumele sizinzile ukuqinisekisa idatha ehambisanayo. Kwezinye izimo, kudingeka izilinganiso ezengeziwe, njengezindawo zokulinganisa ukujula noma izilinganiso zejubane lamagagasi kusetshenziswa indlela evamile ye-midpoint (CMP), noma ukuhlolwa ezintweni ezijulile ezaziwayo.
3. Ukucutshungulwa kwedatha
Idatha ye-GPR eluhlaza ngokuvamile idinga ukucutshungulwa ukuze kucaciswe ukubonakaliswa nokunciphisa umsindo. Izinqubo ezivamile zifaka:
– I-Dewow ukususa izingxenye zemvamisa ephansi.
– Ukulungiswa kwe-zero yesikhathi ukuze kuhambisane nendawo yokuqala yesiginali.
– Ukuthola amandla okukhulisa izimpawu zokukhanya ezibuthakathaka ekujuleni okukhulu.
– Ukususwa kwesizinda ukuze kuncishiswe ukubonakaliswa okuvundlile okungafuneki.
– Ukuhlunga ukuze kuncishiswe umsindo othile wemvamisa.
– Ukufuduka ukuze kulungiswe indawo yesibonisi ukuze isimo sento sibe ngokoqobo kakhudlwana.
Ukucubungula okufanele kuthinta kakhulu ikhwalithi yokuhumusha, ngakho-ke kudingeka kwenziwe ngokucabangela izimo zejoloji kanye nohlobo lwento ehlosiwe.
4. Ukutolika kanye nokulingisa
Ukuhumusha kwenziwa ngokuhlonza amaphethini okuzindla, ama-hyperbola, ama-discontinuities, noma ama-amplitude anomalies. Uma ucwaningo lwenziwa kugridi, idatha ingahlelwa ibe umbono wesikhathi, okuvumela iphethini yokusatshalaliswa kwezinto ukuthi ibonakale ekubukeni kohlelo. Imiphumela yokuhumusha ibese yethulwa kumamephu, izigaba eziphambene, noma amamodeli e-3D ngezinjongo zokubika kobuchwepheshe.
Izinhlelo zokusebenza ze-GPR ekumepheni izakhiwo ezingaphansi komhlaba
I-GPR inezindlela eziningi zokusebenzisa ngoba ingathola izinhlobo eziningi zezinto kanye nezinguquko ezintweni. Ezinye zezinhlelo zokusebenza ezivame kakhulu zifaka:
1. Ukutholwa kwezinsiza ezifakiwe
I-GPR isetshenziselwa ukuthola amapayipi ensimbi nalawo angewona awensimbi, izintambo zikagesi, kanye nemigqa yokukhipha amanzi. Iwusizo kakhulu ngaphambi komsebenzi wokumba ukuvimbela umonakalo nezingozi.
2. Uphenyo lwemigwaqo kanye nesikhumulo sezindiza
I-GPR ingalinganisa ubukhulu bezingqimba ze-asphalt kanye nezindlela zesisekelo, ibone ukuhlukaniswa, futhi ithole imigodi engabangela ukwehla.
3. Ukuhlolwa kwezakhiwo zekhonkrithi nezakhiwo
Ezindaweni ezikhonkolo, i-GPR ivame ukusetshenziswa ukukala indawo yokuqinisa, imisipha, noma ipayipi kanye nokuthola izikhala kanye nokwakheka kwezinyosi.
4. I-geology engajulile kanye ne-hydrogeology
I-GPR iyakwazi ukumaka imingcele engajulile ye-stratigraphic, inhlabathi yasendulo yemifula, noma ukujula kwetafula lamanzi angaphansi komhlaba ngaphansi kwezimo ezifanele.
5. Ukuhlolwa kwezinto zakudala kanye nokuhlolwa kwesayensi
Ukudweba imephu yezindawo zakudala, izisekelo ezindala, noma izinkomba zokungcwaba kungenziwa ngaphandle kokuphazamisa ngaphambi kokumba.
Izinzuzo kanye nemikhawulo ye-GPR
Ngokweqile
– Akubhubhisi futhi akudingi ukumba.
– Ngokushesha ukuze kufinyelelwe indawo ebanzi.
- Isixazululo esiphezulu sama-targets angajulile.
– Ingasetshenziswa ezindaweni ezahlukene ezifana nomhlabathi, ukhonkolo, kanye ne-asphalt.
Ukulinganiselwa
– Ukungena kunqunyelwe ezintweni ezihambisa umoya njengobumba olumanzi noma inhlabathi enosawoti omningi.
– Ukuhumusha kudinga ulwazi ngoba izinto eziningi ezingavamile zingafana.
– Idatha ithintwa yizimo zobuso, umsindo we-electromagnetic, kanye nokushintshashintsha komswakama.
– Ukuqagela ukujula kudinga ulwazi olunembile lwejubane lamagagasi.
Ngakho-ke, i-GPR ivame ukuhlanganiswa nezinye izindlela ezifana nokuhlola kokuqinisekisa, ukuhlola kwe-geoelectric, noma okune-magnetic ukuze kwandiswe ukuthembeka.
I-Penutup
Ukumaka izakhiwo ezingaphansi komhlaba nge-GPR kuyisisombululo esisebenzayo sokuthola isithombe sezimo ezingaphansi komhlaba ngokushesha nangokungabhubhisi. Ngokuqonda izimiso zayo zokusebenza, ukukhetha i-antenna efanele, ukwenza ukutholwa kwedatha okunembile, nokuyicubungula ngokucophelela nokuyichaza, i-GPR inganikeza ulwazi olubalulekile lokuhlela intuthuko, ukugcinwa kwengqalasizinda, kanye nocwaningo lwesayensi. Naphezu kwemikhawulo yayo ezimweni ezithile zenhlabathi, i-GPR isalokhu iyindlela ebalulekile ekuphenyweni kwesimanje okungaphansi komhlaba ngenxa yokuguquguquka kwayo kanye nemiphumela eningiliziwe eyinikezayo.
Uma ufisa, ngingaguqula lesi sihloko sibe sezobuchwepheshe kakhulu (ngamafomula ejubane lamagagasi, izibonelo ze-radargram, kanye nokugeleza kokucubungula okuphelele) noma sithandwe kakhulu ngabafundi abajwayelekile, kanye nokufaka izifundo zamacala ngokuya ngendawo oyidingayo.
