加筋挡土墙离心模型试验研究

CENTRIFUGE MODELLING OF GEOTEXTILE-REINFORCED COHESIVELESS SOIL RETAINING WALLS

为了更深入研究加筋挡墙的加筋机理，本文运用离心模型试验手段，对加筋挡墙的破坏形式，破坏面及不同加筋参数（包括不同加筋间距、筋材强度、加筋长度以及基础强弱等）对墙体的影响进行了离心模型试验研究。试验结果揭示了加筋挡土墙的主要破坏形式、破坏机理以及主要加筋设计参数对墙体的影响。

Twenty-four vertical reinforced soil retaining wall models built with sand and gravel as the backfill and reinforced with anonwoen geotextile simulant were tested to failure under increasing self-weight in the geotechnical centrifuge. The failuremodes, the failure surfaces and the effects of different parameters, including the strength, spacing and length of reinforcement, as well as the strength of foundaion on the retaining wall were investigated. The test results show that: (1) the pat-tern of the failure surface are approaching to the logarithmic spiral and the 0. 3H type failure surface used in the wall design ismore reasonable than the Rankine surface. (2) the reation between the reinforcement strength, spacing, length, backfillstrength and the integral strength of retalning wall follows the theory of quasi-cohesive force. (3) enough anchorage length of reinforcement is requisite, and the length depends on the frictional properties of soil. (4)within a certain range, the effectof foundation upon the safety of retaining wall is not large.