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固化黄土的强度问题关系到黄土地区边坡、公路路堤等处理工程的安全稳定。以山西太原地区黄土,掺入新型高分子固化材料SH形成固化体,就不同掺量、干密度和含水率等变化因素条件下的固化黄土进行直接剪切试验,测定固化黄土的抗剪强度,分析抗剪强度指标的影响因素和变化特性。结果表明,固化剂SH掺量、含水率和干密度等是影响固化黄土抗剪强度的重要因素;内聚力和内摩擦角随着SH掺量和固化体干密度的增大及风干养护时间的延长而增大,而随含水率的增大内聚力呈指数式衰减,内摩擦角为多项式分布递减。实际应用时可以通过增大固化剂掺量和干密度、控制含水率而满足黄土固化工程需要和稳定安全。与条件基本相同的水泥和HEC对比发现,SH固化黄土的抗剪强度高于水泥和HEC。
The strength of solidified loess relates to the safety and stability of slopes and highway embankments in loess areas. In the Taiyuan area of Shanxi Province, the loess was mixed with a new type of polymer solidification material SH to form a solidified body. The direct shear test was conducted on the cured loess under different factors such as the content, dry density and moisture content. The shear strength, Analysis of influencing factors and changing characteristics of shear strength index. The results show that the SH content, moisture content and dry density of curing agent are important factors affecting the shear strength of cured loess. The cohesion and internal friction angle increase with the increase of SH content and dry density of cured body and the drying maintenance time While the cohesion decreases exponentially with the increase of water content, and the internal friction angle decreases with the polynomial distribution. In practical application, the dosage of curing agent and dry density can be increased to control the moisture content to meet the needs of loess solidification engineering and be stable and safe. Comparing with the cement with HEC with the same conditions, the shear strength of SH-cured loess is higher than that of cement and HEC.