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<br /> <br />Collapsing Soils <br /> <br />COLLAPSING and settling 50115 are relatively low density <br />mater i a Is wh i ch shr I nk 1 n vo I ume when they become wet, and/or <br />are subjected to great weight such as from a bui Iding or road <br />fi II. The process of collapse with the addition of water is <br />also known as hydrocompaction. <br /> <br /> <br /> <br /> <br />tdbl <br /> <br />,//;;H/ <br />. ( ( {',Jfl. <br />III" 'I <br />/ / ( I If . <br /> <br />. 'III!I /', <br />If' ,I ( It <br />I II II/I, <br />I' I; ( <br />, //1 / (/ . <br /> <br /> <br /> <br /> <br />...... f/UI/I!,'// <br />'. tI, I, ,I II'. <br />i!ll/~c!;'!;/ . <br /> <br /> <br />l:? <br /> <br />~bl <br /> <br />, "11,/1" / '1/ . <br /> <br />It, Ii II!' ( { <br /> <br />( '{ II!{ I I. <br />- __';{ I I I <br /> <br />Successful multiple sequential land-use of mined areas requires planning and <br />engineering from the beginning. As illustrated here, filling a clay pit with <br />trash and placing structures on the fi II may not be successful due to the <br />settlement of fill as It decomposes. Controlled placement of fl II and/or <br />drl I led pier foundations can often create stable conditions for structures In <br />similar situations. Other situations may require an open space use of land. <br /> <br />41 <br />