STRONG INTERLOCKED SKELETON DENSE GRADATION FOR GRADED BROKEN STONES

摘要

In order to improve the mechanical properties of graded broken stones (GBS) , step filling method is adopted to get coarse aggregate gradation based on the principle of minimum void ratio. A study is made on physical-mechanical properties of GBS by changing the proportion of coarse to fine aggregates as well as fine aggregate gradation, and the gradation with excellent physical-mechanical properties is preliminarily put forward. On this basis, a further study is made on the influence rules of sieve pores' through rate on the mechanical properties of GBS. Subject to the principle of optimal mechanical property, strong interlocked skeleton dense gradation (SISD) is proposed, as well as verified by means of particle flow simulation technique. It turns out that the SISD proposed in this paper, with CBR up to 500 ～ 550% and shear strength up to 0.28MPa、 0.78MPa、 1.78MPa and 2.45MPa when confining pressure is 100kPa、 300kPa、 500kPa and 700kPa, is of optimal mechanical property compared with that put forward in existing literatures, so as to realize the target of strong interlocked. Therefore, the research achievements can be referenced in design and construction of GBS.