Deformability and Settlement of Jointed Rock Mass

This paper deals with in-situ parameters of rock mass determined by conducting five plate load tests in the right bank drift of Anji Khad Bridge. There are vast variations in deformability of rock mass even in close vicinity and it may be due to the extent and nature of discontinuities as seen from the results. Net settlement and elastic rebound varies from 0.185 mm to 0.615 mm and 0.993 mm to 1.655 mm respectively at applied stress 5.66 MPa. Expected settlement of bridge foundation for 1200m 2 footing varied from 7.40 mm to 16.44 mm at applied stress 5.66 MPa. Values of coefficient of uniform elastic compression (C u ) and modulus of sub-grade reaction (K z ) varied from 326 kg/cm 2 /cm to 534 kg/cm 2 /cm and 68 kg/cm 3 to 148 kg/cm 3 respectively.