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... <br /> <br />1+I+ PO'I'EN'1'IAI. IIYItltO(_Ohll'A'fl~t[I: an arc•^ which m;+y be subject [o the <br />Juwur;ard displarr-rm~n[ nl the };round surlarc by cuLlnpse uF <br />certain ]uw-density, w•ak soils aFter wet[ing, hxresslve <br />wctt in}; from irri1;ot ion, hrokeu wn CCr liucs, surface pond lag, <br />or drrinage diversions crut causehydroconq~acti.ur, ~ soils <br />foun~ln[lon Lrvc;;tign[lun should Lc made to dr_ccrminc [he <br />sr•v~u~ity of this ha::ard and ascertain ef.fcctivc mi[i};atlon <br />un. [hods. <br />cs EXYAN;IVI•: (S1JEf,1.it2C) S01_I. OR ROCK: loll or ruck that contains <br />clay; [lint er:}rood signil.icantly upon wetting and shrink upnu <br />drying, In the study arra, the I-tancos Shah :md dc•poelts derived <br />from the Manchus Shale :ire e:;peciully prune to such changes in <br />volume. Expansive coil ur rock eery cause stnrcCUrn] damage to <br />buildings, roads, and pipcl.iucs and should bc. evaluated by a <br />::oils rutd LoundatJon engineering iuvesti};;rti.on, <br />1 <br />;I~ j <br />