摘要
通过大型物理模型试验,研究预应力格构锚固体系中格构梁在预应力作用下、滑坡发展过程中及滑坡极限状态的内力分布规律,并与倒梁法内力计算结果进行对比。试验结果表明:预应力格构梁各点应变在滑坡发展过程中逐渐增大,且存在2个极值点,正极大值位于跨中,负极大值位于节点,两者关系为节点处大于跨中;格构梁在跨中为外侧受拉,节点处为外侧受压;横梁应变呈左右对称分布,竖梁应变随加载呈上小下大分布;在预应力作用下,各横梁、各竖梁受力一致,但极限状态时,横梁从坡顶至坡脚受力依次增大,底梁内力明显大于顶梁;横梁竖梁受力不同,横梁节点弯矩大于竖梁节点弯矩;格构梁内力试验测试值与倒梁法理论值分布趋势基本一致,两者在边跨部分较为接近,中跨部分差异较大,倒梁法不能很好反映梁中间位置的受力状态。研究结果可为格构锚固体系的设计提供一定参考。
The internal force distribution in lattice beams of prestressed lattice anchorage system under the action of prestress,in the process of landslide and at the limit state of the landslide was investigated through large-scale physical modelling test. The test results were compared with the ones calculated with the reverse beam method. It was found that the strains in lattice beam increased gradually in the process of landslide development with two extreme values,of which the positive maxima occur at the mid-spans and the negative maxima appear at the nodes. The abstract values of the latter were greater than the former. The mid-span of the beam was in lateral tension while the node part was in lateral compression. The strains in horizontal beam were symmetrical while the strains in vertical beam were increased from top to bottom. In the prestressing stage,the forces in each horizontal beam and each vertical beam were the same. But in the limit state,the forces in horizontal beams increased from top to bottom. The internal forces in bottom beam was significantly greater than that in top beam. The forces in horizontal and vertical beam were different. The bending moments at the nodes of horizontal beam were greater than that of vertical beam. The internal forces of the test values and theoretical values with the reverse beam method had basically the same trend,which were relatively close at two ends but were different at the middle part. The method of reversing beam cannot reflect the exact state of forces in the middle of beams.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第8期1619-1627,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国土资源大调查项目(1212011220145)
陕西省自然科学基金项目(2013JM5004)
关键词
边坡工程
滑坡防治
预应力
格构锚固体系
格构梁
内力
slope engineering
landslide protection
prestressed force
lattice anchor system
lattice beam
internal force
