Izinsiza zokumba ezinezikhala eziphansi eziklanyelwe ukuze zisebenze ngaphakathi nezitulweni zimele isigaba esibalulekile sezinsiza ze-geotechnical ezikhethekile ngaphakathi komongo obanzi wokwesekwa komhlaba nokuphuculwa kwezintaba. Lezi zinhlelo zokumba ezinkulu, ezilula ukuhamba zenzelwe ukusebenza ezindaweni ezivulekile lapho izinsiza zokumba ezigcwele zingafinyelelwa khona, okwenza zibe zibalulekile emisebenzini yokunamathisela umhlaba ezitulweni, emikhakheni engaphansi, ekutsheni okulalelwayo, nakwezinye izinhlelo ezinamazinga aphansi. Ukufuna lezi zinsiza kuye kwandile kakhulu ekuthuthukiseni amadolobha, ekwakheni izitimela, nasezinhlelweni zezokwakha eziphansi lapho izinkinga zendawo ziwumgomo ophakeme wokwakhiwa. Umsebenzi oyinhloko wezinsiza zokumba ezinezikhala eziphansi emisebenzini yokunamathisela umhlaba uhilela ukubumba izimbobo ezizilawulayo ngezinhlangothi ezilawulwayo nezindlwana ezijulile emhlabathini noma ezithombeni ezizungezile, kulandele ukufakwa kwezinsimbi zensimbi noma izakhi zokwakha umhlabathi ezigcotshwe endaweni. Lezi zinsiza kumele zigcine amandla akho okumba ngesikhathi sevensi ngaphansi kwemikhawulo yepharamitha yephakethe, kuvame ukuthi kudingeke ama-masts akhokhelayo noma ahambayo angabhalwa phansi noma abuye axhaswe phakathi kweziteshi zokumba. Ezindaweni zezitulweni ikakhulukazi, abaphathi kumele babhekane nezindawo ezikhawulelwe zokudla, izimfuneko zokulawula uthuli, kanye nesidingo sokufuduka masinyane njengoba umsebenzi uqhubeka phansi kwesitulo. Lezi zinsiza kumele ziqhubeke zisebenza ngokufanele kokumba kungakhathaliseki ukuthi zifakwe emigqeni yokuhamba yokunciphisa noma kumajazi anemikhono ezitebhisini ezihambayo, ukuqinisekisa ukubumba izimbobo eziyisikhumbuzo, ukubumba izimbobo ezimile, nokujula okungashintshi phakathi kwezimo zomhlaba ezihlukene kanye nezithombe zezitshalo. Izimo zomhlaba ezitholwa emisebenzini yokunamathisela umhlaba nokuphuculwa kwezintaba zihluke ukusuka emhlabathini okukhukhulelayo nakuma-clays ahlangene kuya ezithombeni eziphukile, kudinga izinsiza zokumba ezine-torque eyanele, amandla okubhangqa, kanye nejubane lokujikeleza. Lezi zinsiza zokumba ezinezikhala eziphansi ezisebenza kulezi zindawo kumele ziwuhlanganise umsebenzi wokumba nokuphepha emisebenzini evulekile, kufaka phakathi izinhlelo zokukhanya, ukususa uthuli, nezixazululo ze-visibility zomphathi. Lezi zinsiza zivame ukuthunyelwa ngokuhlanganyela nezinhlelo zokugxila, amathuluzi wokuhlola ukuzinza komhlaba, nezinsiza zokuhlola umthwalo njengengxenye yecebo eliphelele lokuxhasa umhlaba. Izicelo zifaka phakathi ukuphuculwa kwemikhuba yokugijima ezindleleni zokusebenza zamathusi, ukwakha izakhiwo ezikhona ngesikhathi sokumba, ukugcina ubuso bokumba ezinhlelweni zesitimela, ukuvimbela ukuwa kobuso emisebenzini yokumba, nokwengeza izindawo zomhlaba ezibuthakathaka ngesikhathi sokuthuthukiswa okuphansi. Izincazelo zobuchwepheshe bezinsiza zokumba ezinezikhala eziphansi zifaka ukuthi ubude be-mast obuphetheka phakathi kwamamitha angu-2.5 no-4.5, okwenza zifanele izimfuneko zokuphakama eziphansi ngenkathi zigcina izindlwana zokumba zingu-8 kuya ku-30 meters kuncike kumodeli ethile nezimo zomhlaba. Ukukhetha ubuchwepheshe obufanele bezinsiza zokumba emisebenzini yokunamathisela umhlaba ezinezikhala eziphansi kudinga ukuhlolwa okulungile kwemikhawulo ethile yendawo, izicelo zokumba ezilindelwe, izimfuneko ze-pressure yokugxila, kanye nephrofayili ye-geological yemijondolo eqinisiwe. Abakhamphani abakhiqiza lezi zinhlelo ezikhethekile kumele babe nolwazi lwezindlela zokumba ezitholakala kuzo, ukuqonda kwezobuchwepheshe bomhlaba, nokuhlangenwe nakho nezindinganiso zamanje zokwakha eziphathelene nokuhlolwa kokuphakama.
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