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为掌握不同水保措施下土壤含水率分布规律和土壤含水率对土壤抗剪强度影响程度的差异性,对上辛庄水保科技示范园的水平条和鱼鳞坑措施径流小区和裸土对照小区的不同土层深度的土壤含水率和土壤抗剪强度展开实验,结合当地的气候、地质、土壤和水文条件,研究了0~100 cm土壤深度下不同水保措施下的土壤质量含水率空间分布特征及其对土壤抗剪强度的影响。研究结果表明,坡面含水率总体上下坡大于上坡;对于不同坡面的相同坡位处,土壤含水率差异较小,水平条坡面>鱼鳞坑坡面>对照坡面。结合原状土和重塑土的抗剪强度实验可知,在土壤容重=1.04 g cm-3、含水率为7%~16%的范围内,抗剪强度随着含水率的增加先增加再减少。在此条件下,含水率对抗剪强度的影响主要是通过影响土壤的黏聚力来改变抗剪强度,对内摩擦角的影响较小。结果表明,采取水平条措施的坡面蓄水能力比鱼鳞坑坡面和对照坡面强,有较好的水保效益;在含水率低于16%的情况下,相对于采取水平条措施和鱼鳞坑措施的坡面,裸土坡面容易受破坏,坡体内部的潜在失稳风险较大。
In order to understand the distribution of soil water content under different soil and water conservation measures and the difference of soil moisture content on the shear strength of soils, this paper analyzed the differences of horizontal strips and scale-scale measures of runoff plot and bare soil plot in Shangxinzhuang Soil and Water Conservation Technology Demonstration Garden Soil moisture content in soil depth and soil shear strength were studied. According to the local climate, geology, soil and hydrological conditions, the spatial distribution characteristics of soil moisture content at 0-100 cm soil depth under different soil and water conservation measures were studied. Its impact on soil shear strength. The results show that the slope water content is generally lower than the uphill slope; for the same slope position of different slope, the difference of soil moisture content is small, horizontal slope> scale slope> control slope. According to the shear strength test of undisturbed and remolded soils, the shear strength first increases and then decreases with the increase of water content in the range of soil bulk density = 1.04 g cm-3 and water content of 7% -16%. Under these conditions, the influence of moisture content on shear strength is mainly influenced by the cohesion of the soil to change the shear strength, but less influence on the internal friction angle. The results showed that the horizontal water storage capacity was better than that of the fish scale pit slope and the control slope slope. When the moisture content was less than 16%, compared with the horizontal water level measure and Slope scale measures, bare soil slope vulnerable to damage, slope potential greater risk of instability inside.