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为研究水泥砂浆固化土剪切强度特性和合理确定水泥砂浆固化土工程应用的配比,从掺砂量、水泥掺入比、原料土含水率及砂料粒径入手,对水泥砂浆固化土进行了室内固结不排水三轴(CU)试验研究。结果表明,掺砂可以改善固化土强度;随掺砂量的增加,黏聚力和有效黏聚力先增加后减小,转折点的掺砂量为最佳掺砂量(10%左右),内摩擦角和有效内摩擦角不断增加,一定掺砂量下增加水泥掺入比可有效地提高固化土的强度;随着含水率的增加,固化土的黏聚力呈近似线性减小的关系,而内摩擦角几乎保持不变,采用水泥砂浆处理高含水率软弱地基时适当提高掺砂量,可以较大幅度改善固化土的力学性质;在掺料配比一定的情况下砂料粒径对固化土的抗剪强度指标存在一定的影响。采用单一粒径砂料的固化土抗剪强度更高,该单一粒径在固化土级配良好的前提下,不均匀系数Cu趋于最大、曲率系数Cc趋于最小。
In order to study the shear strength characteristics of solidified soil of cement mortar and reasonably determine the proportion of cement mortar solidified engineering application, starting from the amount of sand mixed, the cement incorporation ratio, moisture content of raw material and sand particle size, cement mortar solidified soil Indoor consolidation undrained triaxial (CU) experimental study. The results show that the strength of hardened soil can be improved by using sand. With the increase of sand content, the cohesion and effective cohesion firstly increase and then decrease, and the optimum amount of sand (about 10%) at the turning point is The friction angle and the effective internal friction angle increase continuously. Adding a certain amount of cement mixed with sand in a proper amount can effectively increase the strength of the hardened soil. With the increase of the water content, the cohesion of the hardened soil shows an approximately linear decrease. While the internal friction angle is almost the same. When cement mortar is used to treat soft foundation with high moisture content, the proper amount of sand is increased, which can greatly improve the mechanical properties of the solidified clay. When the mixing ratio is certain, Cured soil shear strength index there is a certain impact. The shear strength of solidified soil with single particle size sand is higher. Under the condition of good solidified soil gradation, the nonuniformity coefficient Cu tends to be the maximum and the curvature coefficient Cc tends to the minimum.