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通过室内土工试验,测试庆阳地区马兰黄土在天然状态及风干、加湿、夯实、加筋等不同条件下的强度性质,为黄土窑洞稳定性分析提供必要的物理力学性质指标。结果表明:原状黄土的强度对含水量极为敏感,黄土含水量增大到饱和状态时粘聚力可从30kPa减少到0kPa;草泥的强度控制因素为筋土质量比,最佳质量比在3%～5%,拌合时稠度大于0.75,风干后的加筋土c值可达到178 kPa～201kPa,φ值可达50°～55°,破坏后草泥的残余强度依然保持比天然黄土高的水平,当垂直压力为100kPa时,草泥的抗剪强度可达天然黄土的4.5倍;夯实土的单轴极限抗压强度为2.09～3.46MPa。
Through indoor geotechnical test, the strength properties of Malan loess in Qingyang area under natural conditions and in different conditions such as air drying, humidification, compaction and reinforcement were tested to provide necessary index of physical and mechanical properties for stability analysis of loess cave. The results show that the strength of undisturbed loess is extremely sensitive to the water content, and the cohesion decreases from 30 kPa to 0 kPa when the water content of loess increases to saturation. The strength control factor of grass mud is the mass ratio of reinforcement to soil, and the best mass ratio is between 3 % ~ 5%, the consistency is greater than 0.75 when mixed, the c value of air-dried reinforced earth can reach 178 kPa ~ 201 kPa and the value of φ can reach 50 ° ~ 55 °. The residual strength of grass mud after the destruction remains higher than that of natural loess When the vertical pressure is 100kPa, the shearing strength of the grass mud can reach 4.5 times that of the natural loess. The uniaxial ultimate compressive strength of the compacted soil is 2.09 ~ 3.46MPa.