Studies On Falling Weight Deflection

Highway construction has been increasing rapidly for recent years. Up to date, the total length of expressway has reached 2000km,in Hebei, it has exceeded 1500km .In order to adapt for the quick development, we need a kind of deflection examination equipment which is more exact, more efficient and hold more data, then accordingly anew analysis method for pavement, bearing capacity .The presence of Falling Weight Deflectmeter meets this need.It has been more than ten years since we introduced FWD into our field at the end of 1980s. Because the application of FWD is not widespread and the experiment -criterion is very lagging, we have some difficulties in its direct application. In order to solve this problem, we selected the different, test section, finished a large number of parallel examinations, then found the correlation and applied it in our province.At present we have obtain some achievement in the research of the deflection basin measured by FWD. According to the deflection basin, we can calculate the pavement elastic modulus. But we need to excavate much pavement to verify the accuracy of the result; so our research result is still in the primary phase. At the soon future, this problem will be solved.