N.J. Admin. Code § 19:6-2.24
Current through Register Vol. 56, No. 24, December 18, 2024
Section 19:6-2.24 - Allowable soil bearing pressures(a) The allowable soil bearing pressures on satisfactory bearing materials shall be those established in table 613.7. The allowable bearing pressures on nominally unsatisfactory bearing materials shall be those established in accordance with section 25 of this subchapter. Allowable bearing pressures shall be considered to be the allowable pressure at a point in the soil mass in excess of the stabilized overburden pressure existing at the same point prior to construction operation. The stabilized overburden pressure existing at a point shall be defined as that portion of the weight of the overlying soil material that is supported by granular interaction rather than pore pressure. In general, the magnitude of the stabilized overburden pressure may be approximated as follows: 1. The overlying soil material shall have been in place for an adequate length of time to produce a stable condition of pore pressure in or below the foundation level. Where the bearing stratum consists of soils of classes 5-65 through 8-65, the bearing stratum shall be considered to be fully consolidated except with regard to the weight of that portion of the overlying soil material that consists of added fill material.2. Where all or a portion of the overlying soil consists of fill material, the weight of the fill material shall not be included in the stabilized overburden pressure unless the magnitude of stabilized pressure is verified by an analysis acceptable by the chief engineer on the basis of laboratory or field tests on undisturbed material.3. Bearing stratum: Where the bearing stratum consists of soils of classes 9-65 through 11-65, the stabilized overburden pressure shall be considered as zero unless the magnitude of the stabilized pressure is established by an analysis acceptable by the chief engineer on the basis of laboratory or field tests on undisturbed material.4. The stabilized overburden pressure shall not include the weight of any soil removed by excavation and not replaced. For footings, the total stabilized overburden pressure shall not exceed the weight of a one square foot column of soil (considering submerged weight where the soil column is partly submerged) measured from the bottom of the footing to the lowest level of the final grade above the footing. For a box foundation, where the strength of the slab is adequate to stabilize the underlying soil, the stabilized overburden pressure shall not exceed the weight of a one square foot column of soil measured from the bottom of the box to the lowest level of the adjacent grade.5. Where the bearing stratum consists of soils of classes 9-65 through 11-65, the allowable bearing pressure shall be adjusted for the effects of rebound due to excavation as determined from consolidation test data.6. Where the bearing stratum consists of rock of classes 1-65 through 3-65, the stabilized overburden pressure shall be neglected. N.J. Admin. Code § 19:6-2.24