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为分析研究延北地区黄土力学特性,以某站场工程为例,采用探井取样进行土工实验,结合黄土现场力学特征,进行拟合计算,经过统计分析可知,延北地区黄土有其地区特征,受气候及降水影响,不同时代饱和黄土压密性不同。根据实验,延北地区黄土强度受含水率大小、土层埋深及矿物成分和胶结强度的相互影响。当黄土超过实验统计的最佳含水率时,随着含水量增大强度逐渐减小。随着黏粒含量增加,黄土强度增大。由于上覆土层压力,黄土随深度的增大强度增加。工程建设中应保持在最佳含水量,并且不超过最佳含水量的1%的范围,以提高延北地区黄土强度。
In order to analyze and study the mechanics characteristics of loess in Yanbei area, take a station project as an example, carry on geotechnical experiment with exploratory well sampling and combine the mechanics characteristics of loess site with the fitting calculation. After statistical analysis, it can be seen that the loess in Yanbei area has its regional characteristics, Affected by climate and precipitation, different ages have different compactness of saturated loess. According to the experiment, the strength of loess in Yanbei area is affected by the water content, the depth of soil layer and the mineral composition and cementation strength. When the loess exceeds the optimal moisture content of the experimental statistics, the intensity decreases as the water content increases. As clay content increases, loess strength increases. Due to the overburden pressure, the loess increases with depth. Construction should be maintained at the optimal moisture content, and does not exceed 1% of the optimal range of water content in order to improve the strength of loess in Yanbei.