上覆浅层黏土的嵌固式岩石基础上拔试验研究

Research on uplift test of rock embedded foundation covered by shallow clay

针对西南地区典型上覆浅层黏土岩石地基,进行现场真型嵌固式岩石基础上拔试验,得到基础上拔荷载-位移曲线、上拔荷载-基础边缘土体隆起位移曲线及水平荷载-位移曲线,分析了岩石基础的承载力特性及地基岩土体的破坏特征;根据试验上拔极限承载力,反推出考虑上覆浅层黏土岩石等代极限抗剪强度取值,并采用极限平衡理论验算基础的稳定性,得出与现场试验结果基本吻合的结论。同时,通过与三种常规基础进行技术经济指标比较分析,得出嵌固式岩石基础经济效益优势明显且对自然环境影响破坏小,属于经济、环保型基础,用于西南山区岩石地基的输电线路中可行。

Aiming at the typical rock foundation covered by shallow clay in southwestern region, the onsite uplift test of rock embedded foundation is carried out, from which the uplift load - displacement curve, uplift load - soil upheaval at foundation edge displacement curve, and horizontal load -displacement curve. The paper analyzes the characteristics of rock foundation bearing and foundation damage; deduces the ultimate shear strength value consid- ering shallow clay covered rock according to the tested uplift extreme bearing , and obtains the basically same con- clusion with that of onsite experiment by adopting the stability of checking computations of limit equilibrium. The paper, at the mean time, compares with three common foundations foundations from economic and technical index. It is found that rock embedded foundation, economic and environmental -protective, has a more obvious economic advantage and a less influence on environment, which is feasible for transmission line in southwestern mountainous area.