含根量对原状与重塑草根加筋土强度影响的试验研究

用室内三轴试验方法研究了原状和重塑草根加筋土的强度特性,分析含根量对土体强度的影响,并对二者强度的差异进行量化描述。试验结果表明:对于原状草根加筋土,含根量的增加对内摩擦角基本无影响,但可提高土体黏聚力,并且黏聚力先增加再基本保持不变;对于重塑草根加筋土,存在最优含根量使其强度最高,并且该值与围压相关,随围压的增大,该值增加;重塑草根加筋土的含根量是原状土的4~6倍时,二者土体破坏时的主应力差值基本相等。

Experimental research on influence of root content on strength of undisturbed and remolded grassroots-reinforced soil

Laboratory triaxial tests are carried out in order to understand the strength property of undisturbed and remolded grassroots-reinforced soil (UGRS and RGRS). The influence of root content on soil strength is investigated. Moreover, the strength difference between the two soils is quantitatively described by root content. The laboratory test results show that: (1) As to UGRS, the increase of root content has little effect on the internal friction angle, while it can improve the cohesion which increases first and then keeps unchanged; (2) There is an optimal root content in RGRS making soil strength the highest, which increases with the increasing confining pressure; (3) When the root content in RGRS is 4~6 times that in UGRS, the deviator stresses of RGRS and UGRS in the limit equilibrium state are almost equal.