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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。
The formation of large blocks by grouting in the soil is a potential new type of reinforcement structure. In this paper, a large group of direct shear tests were carried out to simulate the consolidation of soil with gravel and aluminum columns. The test results show that under the condition of direct shear test, the block slippage and overturn, and gradually form the action chain. This significantly increases the shear strength of the soil, causing significant dilatancy of the soil. As the reinforcement ratio increases, the shear strength of soil increases, and its deformation characteristics gradually develop from strain hardening and volume shrinkage to strain softening and volume expansion. The shape of the block has a significant effect on the shear strength of the block reinforced soil.