砂类土体隧道围岩压缩模量的试验研究

砂类土的压缩模量与砂类土体隧道嗣岩稳定性有较大的关系.从影响砂类土体隧道嗣岩稳定性因素及围岩稳定性分级的角度出发,探讨了与砂类土体隧道围岩稳定性相关的压缩模量的影响冈素,发现砂类土的细粒(d<0.074 mm)含量对其压缩模量有较显著的影响,二者呈负相关;砂类土的相对密实度并非完全足越人而压缩模量也越大,还与细粒含量及细粒含水状态仃关:采用砂类上细粒含水率而不是砂类土含水率的方法来评定潮湿砂类土的压缩模量,得出了细粒含水率对砂类土压缩模量的影响规律.根据细粒含量和相对密实度对压缩模量的影响规律,提出了两指标的分级界限.

Test research on compression modulus of sandy soil tunnel surrounding rock

The compression modulus of sandy soil exerts influence on the stability of sandy soil surrounding rock of tunnel. From the perspective of influential factors of the stability of sandy soil surrounding rock and the stability classification of surrounding rock, the influential factors of compression modulus which are related to the stability of sandy soil surrounding rock, are explored. It is discovered that the clay content (d <0.074 mm) of sandy soil has distinct influence on the compression modulus of sandy soil; The relationship between the compactness and compression modulus is not always a direct ratio which is relevant to the clay content of sandy soil and water content of clay. It is held that it is more rational to adopt the water content of clay rather than water content of sandy soil to access the compression modulus of moist sandy soil. Recommended limits of content of clay and compactness for surrounding rock classification are advanced in accordance with the relationships between compression modulus and content of clay , compactness.