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岩溶区公路工程中采用水平加筋处治方法可有效减少岩溶塌陷风险,而该技术目前仍缺乏成熟的计算方法与设计理论,有必要对其展开深入研究。针对这一现状,基于太沙基理想土中拱效应理论确定塌陷上方加筋体所受的荷载,然后根据塌陷上方水平加筋体受力特点,将其划分为临空段、洞端过渡段及锚固段3个受力特征段。对临空段推导其竖向位移微分方程并解得水平加筋体洞端拔出位移与加筋体内拉力水平分量间的关系;对洞端过渡段,假定界面摩阻力达到极限值,结合库仑摩擦定理解得加筋体由于过渡段摩阻力作用而引起的拉力损失值;对洞端锚固段,建立界面荷载传递的理想弹塑性模型,引入荷载传递法基本方程求解,分别考虑加筋体为有限长或无限长两种情况,导得其解析解答,以及塑性段长度解析表达式,由此解算出锚固段端部拉力与位移间关系。结合3个受力特征段的荷载位移关系采用曲线交汇法求解。最后对拉拔试验及足尺试验进行了计算分析,由结果可知,计算值与实测值吻合良好。
The karst area highway project using horizontal reinforcement method can effectively reduce the risk of karst collapse, but the technology is still lack of mature calculation methods and design theory, it is necessary to carry out in-depth study. According to this situation, the load of the reinforced body above the collapse is determined based on the theory of mid-arch effect of the Tarzan base. Then, according to the characteristics of horizontal reinforcement above the collapse, And anchorage section 3 force characteristics section. The vertical displacement differential equation was deduced for the temporary section and the relationship between horizontal pull-out displacement and the horizontal component of tensile strength in the reinforced body was obtained. For the transitional section of the hole, the frictional resistance of the interface reached the limit value, combined with Coulomb The friction theorem solves the tensile force loss caused by the frictional effect of the transitional section. For the anchored section of the hole, an ideal elastic-plastic model of the interface load transfer is established, and the basic equations of the load transfer method are introduced. Finite or infinite length of the two cases, leading to its analytical solution, as well as the analytical expression of plastic section length, thus calculating the end of the anchorage section tension and displacement relationship. Combined with the three load characteristics of the load-displacement relationship using the curve intersection method. Finally, the drawing test and the full-scale test are calculated and analyzed. The results show that the calculated value is in good agreement with the measured value.