块体加固土体大型直剪试验
Large-scale direct shear tests of block-reinforced soil

在土中通过灌浆等方式形成大块体是一种有潜力的新加固结构型式。该文进行了多组砾石、铝柱等模拟块体加固土的大型直剪试验。试验结果表明：直剪试验条件下块体发生滑移、翻转等运动，逐渐形成作用链。这显著提高了土的抗剪强度，引起土发生明显的剪胀。随着块体加固比的增大，土的抗剪强度随之增大，其变形特性由应变硬化和体积收缩逐渐发展为应变软化和体积膨胀。块体的形状对块体加固土的抗剪强度影响显著。
Abstract：Large soil blocks, produced by grouting the soil are a new reinforcement approach with significant potential. Large-scale direct shear tests were conducted on soil reinforced by blocks simulated with gravel and aluminum cylinders. The results showed that the blocks exhibited significant movement and rotation with interaction chains during the direct shear tests. These increased soil shear strength with significant dilatancy. As the block reinforcement ratio increased, the soil shear strength increased and the soil deformation exhibited increased strain softening and dilatancy from the strain hardening and volumetric contraction. The block shape significantly affected the strength of the reinforced soil.