Ukuhlinzeka ngemithombo yokumba i-tunnel kanye nezinsiza zokubopha eziphakeme kubonisa isigaba esikhethekile sokwakhiwa kwezobunjiniyela be-geotechnical ogxile ekufakeni nasekugcineni izinhlelo zokubopha ezindaweni zokumba ngezansi komhlaba. Lolu hlobo lomsebenzi luhlanganisa ukukhipha, ukufaka, kanye nokunisela kwezakhi zokubopha zomhlaba nezinsiza ezihlinzeka ngokwesekela okubalulekile kwezokwakha ezimithonjeni, ezigodlweni, nasezindaweni ezijulile zokumba ezimweni ezinzima zezimpawu zomhlaba. Lezi zixazululo zokubopha zibalulekile ekulawuleni ukuhamba komhlaba, ukuqinisa izindonga ze-tunnel, kanye nokuvikela ukuwa ngesikhathi sokwakha nasekusebenzeni kwesikhathi eside kwemikhankaso yezezimali eziphansi, kubandakanya amasysteme e-metro, izikhungo zamandla e-hydroelectric, ukusebenza kwemigodi, kanye nezinsiza zokugcina eziphansi. Ukuphumelelisa kahle ukusika kwe-tunnel kudinga imisebenzi yokuphuma ngendlela efanele ethathwa ngaphakathi ezindaweni ezivuleleka kancane komhlaba lapho izindlela ezijwayelekile zingasetshenziswa khona. Izinsiza zokumba ze-tunnel ziklanyelwe ukwenza indawo edinga indawo encane, imininingwane ephansi, kanye nekhono lokuhamba kahle ukuze zisebenze kahle ezimeni ezinendawo encane nokufinyelela okufanele okwenza kube semthethweni. Lezi zinsiza kufanele zikwamukele izinkambiso ezahlukahlukene zokumba, kufaka phakathi ukukhipha ngezinsiza, ukukhipha okuthathiwe, nezindlela zokuhamba ngezansi, kuye ngendawo ethile yomhlaba nezidingo zokubopha. Inqubo yokumba idinga ukuphathwa ngokucophelela kwezinto zokumba, ukukhipha izinsalela, nezinhlelo zokuvulela umoya ukuze kugcinwe izimo zokusebenza eziphephile endaweni encane yasezansi. Izimo zomhlaba ezitholakala ekubunjweni kwe-tunnel zihluka kakhulu kuye ngendawo yokwakha nophezulu. Abakhiqizi kufanele babhekane nezindlala eziphukile, imigqa yokhakhayi ebukhali, lezo zinyuka zezimbiwa, nezimo ezihlanganisiwe ezixuba izakhi kanye nezinsiza zomhlaba. Izinsiza zamathafa ngokuvamile zifakwa kumathafa anokuphepha ukuya ezingeni elisetshenziswayo eliphakathi kuka-ama-5 kuya kuka-ama-30 amamitha noma ngaphezulu, kanti izinsiza zomhlaba zisebenza ezindaweni ezithambile. Ukuhlanganiswa kwezinsiza ezibekiwe kudinga izinhlelo zokunyusa ezithuthukisiwe ukuze kufezwe ukukhipha okuphelele noma okwenziwe ngamasondo, kuqinisekisa ukudluliswa okufanele kokukhishwa kanye nokusebenza kahle kwezikhathi zokubopha. Ukuhamba kwamanzi kanye nokuhlolwa kwehydrogeological kubalulekile, njengoba ukufika kwamanzi angaphansi kungaphula izinga lokufaka izinsiza futhi kudinge izixazululo zokuhluza ezikhethekile nezindlela zokumba. Izinsizakalo zokumba i-tunnel zihluka kakhulu emikhakheni eyahlukahlukene yokwakha. Izinsizakalo zokuthuthukisa imikhondo zisebenzisa kakhulu izinhlelo zokubopha ukusekela izinsiza, ukugcinwa kwezikhephe, kanye nezinsiza eziphansi. Imikhankaso yesizwe eyakha izingosi zokwakha i-deep subway, izikhungo ze-parking eziphansi, kanye nezinsiza zokwakha eziphansi zincike kumasistimu wokubopha afakwe kahle ukuze kulawule izithiyo ze-geotechnical. Imikhankaso ye-hydroelectric isebenzisa ukukhalipha kwezinsiza ezisekelweni zemifula, ezindaweni zokugeza, nasezindleleni zemigodi. Abakhi bezezimali ababambisene nale misebenzi badinga imishini ehlanganisa ukunemba kokumba, izakhono zokuphepha endaweni encane, nokwethembeka ezimeni ezinzima eziphansi. Ukukhetha izinsiza ezikahle zokumba i-tunnel, izinhlelo zokuhluza, nezindlela zokufaka kuthinta ngqo ukuphepha komsebenzi, ukusebenza kahle kwezimali, nokuhlanganiswa kwemikhakha yendawo ezitholakala phansi.
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