摘要
进行了加筋土、素土及损伤土的三轴压缩剪切试验,其中损伤土的强度试验按2种方法进行。通过比较,发现加筋土的强度比素土的大,而素土的强度比按方法3所得损伤土的强度大,结合有关文献中的试验资料,按文中定义的5个强度的相互关系分析,认为加筋土的强度是在损伤土的强度基础上增加了一个强度增量而得到,此强度增量是由加筋材料的作用体现出来,若这个增量不足以弥补素土和损伤土之间的强度差值,则加筋土的强度会低于素土的强度,这主要是加筋材料给土试样造成了难以弥补的损伤;若加筋材料的补强作用足以弥补这种损伤,则显示出加筋的作用效果,这种补强作用的效果与加筋材料性质和它在试样中的位置有关;按方法4所得损伤土的强度比素土的强度大,其值同加筋土强度相当,从而证明加筋材料在试样的固结过程起加强作用,试样在剪切阶段表现出比素土高的强度,未发现加筋材料在试样的击实阶段起加强作用。
The tri - axial shear tests were carried out on the soil, the reinforced soil and damage soil. Five kinds strength variables were defined. Compared with the strength of the three kinds soils and these strength variables, referring to the related paper, it is found that the strength of reinforced soil is more than that of soil, and that of soil is more than that of damage one in test method 3. It can be thought that the strength of reinforced soil consists of the strength of damage soil and the strength provided by reinforcement, if the strength provided by reinforcement is less than the difference between the strength of the reinforced soil and that of the soils. The strength of the reinforced soil is less than that of soil, because of the existence of intercalation damage by reinforcement in soil mass. Otherwise, the strength of the reinforced soil is more than that of soil. The strength provided by reinforcement is related to the properties of reinforcement and its location in soil sample greatly. The strength of damage soil equals to that of reinforced soil roughly, and strength of damage in method 4 is more than that of soil, which demonstrates that the role of reinforcement is played only in the process of consolidating soil sample evidently. It is not in the process of forming soil sample seemly. Therefore, the strength of damage soil sample in test method 4 is higher than that of soil sample in the process of shearing.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2006年第6期42-45,共4页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(59479017)
陕西省自然科学基金资助项目(97C22
2001C01)
地质灾害防治与工程地质环境保护国家专业实验室开放基金项目(GZ2005-03
99007)
关键词
加筋土
素土
损伤
结构强度
补强作用
reinforced soil
pure soil
damage
structural strength
compensation strength
