Ukuhlinzeka ngendawo yokumba izithameli, imishini ye-jet grouting yokumba ivelaphi ukhuluma ngemithi yokuhlinzekela izindawo zokwakha engaphansi komhlaba, ikakhulukazi ezindaweni ezibophezelayo lapho izindlela zokwakha ezijwayelekile ezinjengezikhala ezijulile noma izindonga ezikhiyeziwe zingasebenzi kahle noma zingesizo zinzuzo. Le nkathi yokusebenza ihlanganisa imishini ethile nezinhlelo eziklanyelwe ukwenza imisebenzi ye-jet grouting ehloswe kahle ezindaweni zokugaya izikhumbuzo, lapho ukwelashwa kwendawo kumelela ukujwayela ubface, ukulawula ukuhamba, nokuthuthukisa noma yiziphi izici zomhlaba ngaphambi noma ngesikhathi sokuhola umgudu. Izinqubo zokusebenza ze-jet grouting zokumba zifaka phakathi ukungeza kakhulu kwemix ye-cement noma ye-chemical ngok-pressure ephezulu—ngokuvamile i-300 kuya ku-700 bar—ngokusebenzisa umbono wokuhamba noma isikhanga esibekwe kumshini wokuhamba. I-jet stream enezinga eliphezulu, ngokuvamile iphakama ngaphezulu kwama-200 m/s, iklwebha futhi ixubhe umhlabathi odlalayo, ngokuhamba ngesikhathi ophendukayo nokuqhubeka. Le nqubo iqamba i-columnar noma inethiwekhi yezenzo zokuhlobisa zomhlaba ezithuthukisa ukuhlanganiswa, zinciphisa ukungena, futhi ziqinisa ubface bomgudu. Izicelo zihlanganisa i-pre-grouting ngaphambi kobuso bomshini wokumba umgudu (TBM) ezimweni ze-geological eziphansi, i-post-grouting yokulawula ukuhamba komhlaba nokuvikela izikhala ngemuva kwezigaba, kanye nokwelashwa kwezigaba ezithintekile ngezinkinga, ukungena kwamanzi, noma izinguquko ze-geological ezingalindelekile. Ukucaciswa kwemishini ngokuvamile kuqukethe umshini wokuhamba ophethe izinhlelo ezikhethekile ezikwaziyo ukulawula u-jetting ngokuqinile, impahla ye-grouting ephezulu enezinqola ezinamandla ezihloniphekile yokusebenza okuqhubekayo e-500–700 bar, izinhlelo zokuhlunga nezixube, izinhlelo zokuthutha i-slurry, kanye nesikhanga sokuhamba se-jet esinezinhlaka eziningi (ukusebenza okukodwa, kabili, noma kuthathu). Izinhlelo ze-tripod noma zokuhamba ziqinisekisa ukulawulwa kwesikhundla futhi zenza kube lula ukuphendukela phezulu phesheya komgudu. Izinhlelo zokuphinda zisebenze i-mud noma i-slurry zibalulekile, njengoba i-jet grouting yokumba ikhiqiza ivolumu enkulu ye-fluid enezinsiza ezifanele ukusebenza kahle kwezinga lezemvelo. Ukukhetha imishini ye-jet grouting yokumba kuthinteka yizici eziningi kuhlanganisa ukwakheka komhlabathi endaweni bese izinto ezihlelekile ziqinile, izimo zamanzi omhlaba, ukujula kokuphakama nezimo zokucindezela, ububanzi obufiselekayo be-column kanye nezinye izinhlelo, izikhala ezitholakalayo zomsebenzi nezinqoba ezikhungweni zomgudu, kanye nespecification ye-composition ye-grout (i-cement slurry noma i-microfine cement noma i-chemical grouts). Umsebenzi we-jet kufanele ukwazi ukulawula ukujikeleza okuqondile nokwejwayelekile ukuze ifake kahle emholes ukuze iqinisekise ukuhamba okuhle phakathi kwe-columns ezinhle zokubeka ukuze kube nomthelela. Imisebenzi ye-jet grouting yomgudu ibhekwa ngezindinganiso zaseYurophu EN 14679 (Ukuphothula imisebenzi ethile ye-geotechnical—Jet grouting) kanye ne-EN 12716 (Ukuphothula imisebenzi ethile ye-geotechnical—Grouting), kanye nezincazelo zephrojekthi ezitholekayo ezisuke kumarekhodi okuhlola kwe-geotechnical. Imishini kufanele iveze ukuhlonipha imiyalo ye-pressure system futhi ibe nemibhalo efakazela amandla wamapompo, izinga lo-pressure, nezinhlelo zokuphepha. Abasebenzi badinga ukuqeqeshwa ekuphathweni kwencwadi, rheology ye-grout, kanye nokuqashelwa kwe-stability yendabuko ukuze kuqinisekiswe ukusebenza kahle kanye nokuphepha emkhakheni onzima ophansi komhlaba.
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