Experimental and Analytical Study of the Response of Earth Materials to Static and Dynamic Loads.

摘要

A field and laboratory experimental test program was conducted at the Mixed Company and Cedar City test sites to determine the effect of specimen size on the strength and deformation of intact and jointed rock. The strength of Cedar City quartz diorite decreased by a factor of four with increasing specimen size;the Kayenta sandstone decreased by a factor of less than two. A large block test was conducted at the Mixed Company site in which deformation and velocity was measured as a function of stress. The in-situ stress conditions were measured at the Mixed Company site and had a marked effect on the seismic wave velocity in the sandstone. In addition,in situ modulus was measured by several different techniques. A constitutive model for jointed rock,incorporating real data,was developed for use in the calculation of rock mass response. The model for the compressive properties consists of a rate dependent model of the Maxwell type while the plastic shear response due to the presence of joints,is accounted for in terms of additional plastic deformation associated with slip on the joint planes.