Isihlabathi samatshe sibalulekile ezindaweni eziningi zomlando namasiko, okubalwa kuzo iYungang Grottoes edumile. Le ndawo yasendulo inokubaluleka okukhulu ngezifanekiso zayo eziyinkimbinkimbi kanye nefa layo lezenkolo. Ukulondolozwa kwezakhiwo zamatshe esihlabathi kubalulekile ukugcina ifa lamagugu futhi kuqinisekise ukuphila isikhathi eside ngokumelene nezinto ezilimaza imvelo. Izixazululo zamagciwane, okubalwa kuzo imvula enamagciwane eyenzeka ngokwemvelo kanye nezinto ezingcolisa umoya ezidalwa abantu, zibeka ingozi enkulu kuqine kwesihlabathi samatshe. Ukuqonda ukuthi lezi zixazululo zamagciwane zisebenzisana kanjani nesihlabathi samatshe kungaholela imizamo ephumelelayo yokulondolozwa nokubuyiselwa. Lesi sihloko sihluza umthelela wezixazululo zamagciwane kuqine kwesihlabathi samatshe, sigxile ekuhlaziyeni izivivinyo kanye nemiphumela esebenzayo yokulondolozwa.

Izigodi zaseYungang zisebenza njengesibonelo esihle kakhulu njengoba isihlabathi lapha sivame ukuthinteka kalula yizinto ezibola ngamakhemikhali. Amanzi anobuthi, avame ukuba nezinto ezifana ne-sulfuric acid (H2SO4) noma ezinye izinto ezinobuthi, angashesha ukubola lezi zakhiwo zamadwala. Ukusebenzisana phakathi kwezixazululo ezinobuthi nesihlabathi kuthinta izici zomzimba nezamakhemikhali zetshe, okubangela izinguquko ezibukwayo kanye nokuncipha kwamandla. Lesi sethulo sibeka isiteji sokuhlola okuningiliziwe ngezindlela lapho izixazululo ezinobuthi zilimaza ubuqotho besihlabathi futhi sichaza indlela ehlelekile le sifundo esiyilandela.

Ukuqonda imiphumela yezixazululo zamakhemikhali (acid solutions) kukuqina kwe-sandstone, izibonelo zahlungwa ngokucophelela ukuze zilinganise izimo ezitholakala ensimini. Izibonelo ze-sandstone zadlula ekubonisweni okulawulwayo ezixazululweni zamakhemikhali ezahlukene, okuhlanganisa i-H2SO4 nezixazululo zamakhemikhali ezilinganiselayo (buffer solutions), kanye nezixazululo eziyisisekelo (basic solutions) ukuze kwenziwe ukuhlaziywa kokuqhathanisa. Ukulungisa izibonelo kwahlanganisa ukuhlanza, ukumisa, nokulinganisa ubukhulu ukuze kuqinisekiswe imiphumela yokuhlolwa ethembekile. Ukusetshenziswa kwezixazululo kwalinganisa ukusebenzisana kwamanzi amakhemikhali emvelo (natural acid water) okungenzeka i-sandstone ihlangane nayo ezindaweni zemvelo.

Uhlolo lwamandla beluyingxenye ebalulekile yendlela yokwenza izinto. Izivivinyo zokucindezela zilinganise izinguquko emandleni omshini we-sandstone ngaphambi nangemva kokuchayeka ezixazululweni zamakhemikhali. Lezi zivivinyo zinikeze idatha enobungako yokuthi umthwalo wokuthwala itshe wehle kanjani ngenxa yokonakala kwamakhemikhali. Ngaphezu kwalokho, kwenziwa izilinganiso ze-P-wave velocity ukuhlola izinguquko zangaphakathi esakhiweni sedwala. I-P-wave velocity, indlela ye-ultrasonic, ibucayi kumafutha amancane kanye nokushintsha kwe-porosity, inikeza ukuqonda ekulimaleni kwangaphakathi kwe-sandstone.

Imiphumela ibonise izinguquko ezinkulu zokuma ezinsampulini zesihlabathi ezivezwe ezixazululweni ze-acid. Ukuguguleka kwendawo, ukwanda kwe-porosity, kanye nokuncibilika kwemaminerali kwakubalulekile. Amanzi e-acid anciphise kakhulu ukubola uma kuqhathaniswa nezixazululo ezibhakwe noma eziyisisekelo, kugqanyiswa amandla okubhidliza ezindawo ze-acidic. Ukuhlolwa okubonakalayo kanye nokusebenzisa imishini kwakuqinisekise ukuthi imingcele yamagranule yesihlabathi yaba buthakathaka, okuholela ekuhlukaneni nasekuqhekekeni kwendawo.

Uvivinyo lokuqina kokuphusha lubonise ukwehla okukhulu kokuqina kwesihlabathi ngemuva kokuchayeka ku-asidi, lapho izixazululo ze-H2SO4 zibonisa imiphumela emibi kakhulu. Ukwehla kokuqina kuxhumene nezinga lokuncibilika kwemaminerali nokwanda kwe-porosity. Izixazululo ezibhakwe zibonise isivinini esincane sokubola, okubonisa ukubaluleka kwamandla okubhakwa ekunciphiseni umonakalo obangelwa yi-asidi. Ukuhluka kokuqina kokuphusha kugcizelela isidingo sokuqapha ukuchayeka kumakhemikhali ezindaweni zokulondolozwa.

Izilinganiso ze-P-wave velocity zaqeda lezi zitholakele ngokudalula ukulimala kwangaphakathi okwakungabonakali ngaso sonke isikhathi ngaphandle. Izixazululo zamakhemikhali zehlise izilinganiso ze-P-wave, okukhombisa ukwanda kwama-microcracks nokulahlekelwa ukubambana ngaphakathi kwe-sandstone matrix. Le ndlela yokuhlola nge-ultrasonic yaba ithuluzi elibalulekile elingonakalisi ukuhlola ubuqotho be-sandstone endaweni.

Izindlela zokubola zazichazwa njengokuhlanganiswa kokuncibilika kwamakhemikhali kwe-calcite namanye amaminerali ancibilikayo, kuhlanganiswe nokuwohloka ngokomzimba ngenxa yokwanda kwe-porosity nama-microfractures. Ukuqonda lezi zindlela kusiza ekwakheni izindlela ezingcono zokulondoloza, njengokufakwa kwezendlalelo zokuvikela nezinqubo zokulawula imvelo ukunciphisa ukuchayeka emanzini anamakhemikhali.

Lolu cwaningo lubonisa ukuthi izixazululo zamagciwane, ikakhulukazi lezo ezisekelwe ku-sulfuric acid, zithinta kakhulu ukuqina kwe-sandstone ngokubangela ukuguguleka komhlaba, ukuncibilika kwemaminerali, ukulahlekelwa amandla, kanye nomonakalo wangaphakathi. Ukusetshenziswa kwezilinganiso ze-P-wave velocity kunikeza indlela ethembisayo yokuqhubeka nokuqapha isimo se-sandstone. Imizamo yokulondolozwa kufanele ibeke phambili ukulawula ukuchayeka kwamagciwane emvelweni kanye nokuthuthukisa amandla okubuyisela emuva ezindaweni ezizungeze izakhiwo ze-sandstone.

Izincomo zihlanganisa ukufaka izendlalelo zokuvikela ezivimbela ukungena kwamagciwane, ukuhlolwa njalo nge-ultrasonic kusetshenziswa izindlela ze-P-wave velocity, kanye nokugcina izimo zemvelo ezizungezile ukuze kuncishiswe ukwakheka kwamanzi anegciwane. Lezi zinyathelo zizosiza ukulondoloza izindawo ezibalulekile zamagugu ezakhiwe nge-sandstone njenge-Yungang Grottoes. Izinhlangano ezifana ne-Dermax zidlala indima ebalulekile ekuhlinzekeni ngosekelo lobuchwepheshe obusha kanye nezinto ezithuthukisa ukusebenza kahle kokulondolozwa.

Siyabonga iz contributions ezibalulekile ezivela emaqenjini ocwaningo agxile ekongiwe kwezinto zemvelo kanye nesayensi yezinto. Ukusekelwa kwezibalo okuhlinzekwe yiDermax kube kubalulekile ekumisweni kwezivivinyo, ikakhulukazi ezintweni zokulinganisa i-ultrasonic P-wave velocity kanye nobuchwepheshe bezinto. Ukuzinikela kwabo ekuthuthukiseni ubuchwepheshe bokulondolozwa kuhambisana nezinjongo zokuvikela ifa lezamasiko.

Ucwaningo lubhekisa ekukhetheni okubanzi kwezincwadi nge-sandstone weathering, izindlela zokulondolozwa, kanye nezindlela zokuhlola i-ultrasonic. Kubafundi abanesifiso sokuqhakambisa ulwazi lwabo ngesihloko, izihloko ezibalulekile zocwaningo kanye nemithombo enegunya ngemiphumela ye-acid solution kanye nokuqina kwe-sandstone ziyatuswa. Ezicelo ezisebenzayo kwezobuchwepheshe kwezokwelapha nezimboni, hlola kabanzi ku-Mayelana Nathi ikhasi leDermax.

Ababhali bahlangene nezikhungo ezihamba phambili ekugcinweni kwezinto zemvelo kanye nobunjiniyela bezinto. Ukubambisana neDermax kuthuthukise ucwaningo ngokufinyelela ezinsizeni eziphambili zokuhlola kanye nolwazi olukhethekile ngemisebenzi yamachiza nezinto zokwakha. Le nhlanganisela phakathi kocwaningo lwezemfundo kanye nobuchwepheshe bemboni kuqinisa ukubaluleka okusebenzayo kanye namandla okusebenzisa isifundo.