论文部分内容阅读
为了增加桥下被交道路的通行空间,采取袖阀管劈裂注浆加固柱式桥台台后主动压力区土体及台前被动压力区土体,并在分段分级挖除台前填土过程中增设锚杆钢筋混凝土挡墙的内外部双重加固措施;采用Abaqus6.10非线性分析软件,建立柱式桥台前坡加固改造的三维弹塑性模型,模拟分析柱式桥台前坡全断面一次挖除、分段分级挖除两种方案的开挖过程和路基边坡稳定性,确定了路基加固范围;现场监控开挖过程中的墙顶位移和锚杆拉力,分析了土体开挖、挡墙施工过程中的稳定性。研究结果表明:全断面分级开挖支挡方案的稳定安全系数为1.61,路基边坡分段分级开挖支挡方案的稳定安全系数为1.84,分段分级方案更加安全;墙顶位移主要发生在施工期,其间锚杆拉力没有发生突变,挡墙及墙后土体安全稳定;台前与台后劈裂注浆加固,有效提高了加固区土体的抗剪强度和抗变形能力,开挖过程中无坍塌、掉落、滑移等现象。
In order to increase the traffic volume of the road to be paved under the bridge, the soil of the active pressure zone behind the platform and the passive pressure zone in the front of the column bridge are reinforced by the sleeve valve sleeve splitting grouting, In addition, an internal and external double reinforcement measures of reinforced concrete retaining wall are added in the soil process. The Abaqus6.10 nonlinear analysis software is used to establish the three-dimensional elastic-plastic model of the reinforcement of the pillar abutment front slope. Excavation of section once and section excavation of two schemes and the stability of subgrade slope and the reinforcement range of subgrade were determined. On the scene of the excavation, the displacement of top wall and bolt tension were monitored. Digging, retaining wall construction process stability. The results show that the stability safety factor of full-face grading excavation and support scheme is 1.61, the stability safety factor of sub-grade excavation and support scheme of subgrade slope is 1.84, and the sub-grading scheme is safer. The displacement of wall top mainly occurs in During the construction period, there is no sudden change in anchor tension, and the soil behind the retaining wall and the back wall is safe and stable. The grouting reinforcement at the front and back of the retaining wall effectively improves the shear strength and deformation resistance of the soil in the reinforced area. Excavation The process of collapse, drop, slip and so on.