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Subsidence lnve�;tigation Quiros-Martine:z Residence-Zephyrhills, Florida SDII Project Number•3023547 �__- hole to be sure that the cone is completely embedded. The cone point is the into the soi] u�ing the ring weight hammer falling 20 inches. The blow cou lb. hammer to drive the cone can be directly correlated to the blow�o n driven 1-3/4 inches by SPT. Therefore, the DCPT is a method of choice for testing the stren nts required for the 15 foundations, in closely confined spaces, or where there is some �sk o nts and N value obtained correlations b�;tween the cone penetrometer and ASTM D1586 Penetr �h of shallow soils near Sampling of S��ils)on a blow-count basis are used to develo N val f soil collapse. Empirical � ation Test and Split-Barre] There is no A,�>TM method for DCPT, but ASTM S p ues for each of the tests. the instrument and the correlation with SPT blow counts. pecial Technical Publication No. 399 rev�ews Cone Penetra��eter Tests SDII utilizes two versions of friction cone penetrometers. One, the cone enetr standard cone that, because of its size, is inserted b for resistance, The second a " Y a hydraulic ram installed o aeheavy�,obje t inserted with ,� r� ' mini-cone" penetrometer, utilizes a smaller cone and can be mounted on a small vehicle or anchored to the house. While it is more portable, the d!epth of penetration may be limited when using the smaller cone ASTM methods have been developed for the cone but not for the s penetrometer. "t'he data from the two methods are comparable and are interpreted�e enetrometer. maller mini-cone On both syste.rns, the cone includes two sensors. The tip sensor measures the r . s�e way. soil being pene;trated to insertion of the cone. The second sensor, which is a sleeve the cone just above the ti esistance of the p, measures the frictional resistance of the soil against the s d s o�f the cone. The fricl:ion ratio(sleeve resistance divided by tip resistance, ex presse d as a erc especially usei'u] for identifica tion of raveling conditions in soils. The advanta es of u p entage) is ypes of electronic fnction cone systems are ability to identify raveling zones and collec ' continuous dat:,a with depth. The resistance data from the cone penetrometer�g se of both N values obtai�zed from SPT. The d i s a d v a n t a g e o f c one penetrometer testin is th t��n of c a n n o t be co l lected. For this reason SPT is the primary investigation metho b e c o r r e l a t e d t o g at soil samples ASTM Methocl D5778 d used by SDII. governs use of the cone penetrometer. The results of comparisons of tlie results of the smaller mini-cone with the cone penetrometer show that the smaller provides direcitly correlated strength measurements. Since the friction ratio is a ratio resistance measurernent, it can be directly used for sinkhole evaluation and is not sub'e System uncertainties o,r concerns associated with correlation of the mini-cone penetrometer to the �Ot a penetrometer rnethod. ,1 ct to any one Relative Floor Elevation Map If it is determi.ned that the elevation pattern of the floor can provide meanin ful info about the caus;;s of damage to a structure, a floor elevation map is prepared. The fl g rmation map involves laying out a grid inside the house. SDII staff does not move furniture and ot objects, so the grid is limited to accessible areas. A manometer is then used to deteroor elevation elevations to i:he nearest 0.]-inch accuracy. The floor elevation pattern is represented her contour map s]-�owing relative elevation. mine relative by a