In order to increase the usefulness of the pressuremeter (pmt) in the area of pavement design and evaluation, resilient moduli, determined from a special pmt test, were correlated to california bearing ratio (cbr) test results. The pmt resilient moduli-cbr correlations developed compared well with existing resilient moduli-cbr correlations. The special pmt test, called the resilient modulus pmt test, was developed to enable six resilient moduli to be determined from six unload-reload cycles conducted for various load durations along the linear portion of the in situ stress-strain response. The variouscycle lengths enabled resilient moduli to be determined as a function of the load durations typically encountered during the traffic loading of a pavement. The cycle lengths used were 10, 20, 30, 60, 120, and 240 sec. The pmt used was the monocell texam pressuremeter built by roctest, inc. It was concluded that the current texam pmt cannot be used to accurately conduct 10-sec unload-reload loops to determine resilient moduli, but can be used to accurately determine resilient moduli for the remaining cycle lengths and that the resilient moduli from these cycles are reasonable for use in design. This paperappears in transportation research record no. 1309, Geotechnical engineering 1991.
Samenvatting