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利用真三轴仪,对重塑黄土进行了竖向加载条件下的平面应变试验,研究其在平面应变条件下的应力-应变关系、中主应力的变化特性和强度特性。试验结果表明:竖向主应力加载过程中,重塑黄土的应力-应变曲线均为硬化型或强硬化型。同一压实系数和固结围压条件下,含水率愈小,重塑黄土的强度就越高;同一含水率和固结围压条件下,压实系数越大,重塑黄土的强度就越高;同一含水率和压实系数条件下,固结围压越大,重塑黄土的强度就越高;重塑黄土的中主应力随轴向应变的增大而增大,固结围压越大,含水率越小,相应的中主应力越大;随着含水率的增大,黏聚力衰减明显,内摩擦角略有减小;随着压实系数的增大,黏聚力显著增大,内摩擦角几乎不变。
Using true triaxial apparatus, the plane strain test of the remolded loess under vertical loading was carried out to study the stress-strain relationship, the variation characteristics and the strength characteristics of the mid-principal stress under the plane strain condition. The experimental results show that the stress-strain curve of the remolded loess is either hardened or hardened during the vertical main stress loading. Under the same compaction coefficient and consolidation confining pressure, the smaller the water content, the higher the strength of the remolded loess; under the same moisture content and consolidation confining pressure, the greater the compaction coefficient, the stronger the remolded loess High; under the same moisture content and compaction coefficient, the larger the consolidation confining pressure, the higher the strength of remolded loess; the middle principal stress of remolded loess increases with the axial strain, and the consolidation confining pressure The larger the water content, the smaller the water content, the greater the middle principal stress. With the increase of water content, the cohesion decays obviously and the internal friction angle decreases slightly. With the increase of the compaction coefficient, the cohesion Significantly increased, the internal friction angle is almost constant.