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• <br />Tensile strain <br />Compressive strain <br />Subsidence curve <br />• <br />Fi~~ure 3. ~ he three t~hases of subsiiienee develc~pmcnt. <br />• <br />~. , <br />'~1alr i I iChnnli~~ri•~. In.. I .t~~r I ' <br />a) Subcritical excavation <br />b) Critical excavation <br />c) Supercritical excavation <br />