浸泡吸水条件下陶粒土的抗剪强度

【摘要】 由疏松多孔的陶粒构成的陶粒回填土具有重度低、内摩擦角高、透水性好、施工简便等优点。陶粒的易破碎性是控制陶粒土强度与变形特性的关键因素。为研究陶粒土的强度特性,开展了陶粒土直剪试验,分析了浸泡吸水对陶粒土剪切强度的影响。结果表明:陶粒土抗剪强度与法向应力呈非线性关系,浸泡吸水导致陶粒更易破碎。更多还原

【Abstract】 Geotechnical backfills composed of highly porous light-weight expansive clay aggregates(LECA) have advantages of low weight, high internal friction angle, high permeability and easy workability. The high crushability of LECA fundamentally determines the strength and deformation behavior of LECA backfills. To study its shear strength features, direct shear tests on LECA backfill were carried out. The effects of water absorption on the shear strength of LECA backfill were analyzed. The test results show that the shear strength of LECA backfill is nonlinearly related to the normal stress due to particle crushing, and water absorption can promote particle breakage.更多还原