Experimental Study on Shear Strength Evolution of Xiashu Loess under Rainfall Infiltration
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摘要: 针对下蜀土在实际降雨入渗条件下抗剪强度演化规律研究的不足，以镇江两处典型边坡的下蜀土为研究对象，根据自动化监测获得的降雨入渗下的含水率变化数据，开展了降雨入渗条件下下蜀土抗剪强度演化规律的试验研究。研究结果表明：下蜀土的抗剪强度受含水率影响较大，同时存在一界限含水率，在该含水率左右的下蜀土强度特性不同；随着含水率的增加，两处下蜀土的黏聚力都为先小幅减小，而后急剧减小，最后再小幅减小并最终保持稳定；随着含水率的增加，下蜀土的内摩擦角则为先急剧减小，再小幅减小并最终保持稳定。研究结果可为下蜀土边坡的防护治理提供理论依据，具有实际工程意义。Abstract: Under the actual rainfall infiltration condition, the research on the shear strength evolution law of Xiashu loess is insufficient. According to the change of water contents under the condition of rainfall infiltration obtained by automatic monitoring, the experimental research on the shear strength evolution law of Xiashu loess under the condition of rainfall infiltration was carried out in two typical slopes in Zhenjiang. The results show that the shear strength of Xiashu loess is greatly affected by the water content, and the strength characteristics of Xiashu loess are different near limit water content. With the increase of water contents, the cohesion of Xiashu loess decreases slightly at first, then decreases sharply, finally decreases slightly and remains stable. With the increase of water contents, the internal friction angle of Xiashu loess decreases sharply at first, then decreases slightly and finally remains stable. The research results can provide a theoretical basis for the protection and treatment of Xiashu loess slope, and have practical engineering significance.
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Key words:
- Xiashu loess /
- rainfall infiltration /
- water content /
- shear strength /
- field test
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表 2 下蜀土的颗粒组成
山体类型 粒径组成/% 1～0.5 mm 0.5～0.25 mm 0.25～0.075 mm <0.075 mm 宝盖山 2.1 8.5 7.6 81.8 獾山 2.3 8.2 7.8 81.7 
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