摘要
为解决公路隧道超前水平钻孔塌孔问题,基于流固耦合原理,建立单水平钻孔渗流应力耦合模型,利用Geostudio对水平钻孔及其所处的土体进行应力渗流耦合分析。结果表明:孔隙水压力在水平钻孔附近没有变化,但其值在水平钻孔末端至1.1m间迅速增长,拟合直线斜率达到了0.62,1.1~4m间增长较缓,拟合直线斜率为0.36;在水平钻孔末端出现应力集中现象,易造成塌孔;由水平钻孔顶底面的应力数据σx、σy、τxy反算出土体C、Φ值,并判断出土体处于可塑状态且土体被定义为粉粘土,将结果与假定进行比较,验证了Geostudio计算模型的准确性。计算结果有助于公路隧道超前水平钻孔的优化设计。
In order to solve the problem of hole collapse in advance horizontal drilling of highway tunnel, based on the fluid-solid coupling, the fluid-solid coupling model of single perforation was established, which simulated the perforation and the soil body. The results shown that the pore water pressure was approximately equal near the perforation, but the data of the pore water pressure would getting bigger when it was far away from the perforation. Normal stress of the top and bottom face of perforation was getting bigger along with the hole depth increase. Concentration of stress happens in the terminal of the perforation. Back figured data of C and Φ could estimate the soil body is in a plastic state and it is defined of silt-clay which is similar compare with the hypothesis.
作者
赵红刚
李亚隆
ZHAO Hong-gang;LI Ya-long
出处
《建筑机械》
2022年第9期99-103,109,共6页
Construction Machinery
