柱式桥台前坡改造数值分析与现场检测

doi:10.6040/j.issn.1672-3961.0.2014.040

摘要/Abstract

摘要： 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。

关键词: 强度折减法, 劈裂注浆, 锚杆挡墙, 柱式桥台

Abstract: In order to get more traffic clearance under bridge during the road upgrading transformation, an internal and external reinforcement program was proposed to the underpass grade separation. The internal program was the soil reinforcement by the Soletanche method to active pressure soil and passive pressure soil of the abutment, and the external program was the anchored retaining wall by tie rods. Based on Abaqus6.10, the nonlinear FEM software, a 3D elastic-plastic numeric model was built to simulate the transformation process from buried abutment slope to anchored retaining wall. Two kinds of the construction processes were simulated, one was the slope soil excavation in layer vertically only and the other was in section horizontally and in layer vertically, and the soil reinforcement area was determined. Based on site detections to the top displacement and the bolt tension force of the retaining wall, stability analysis during the soil excavation and the wall construction were done, and the anchor pull test was carried out. The results indicated that the stability factor of the slope soil excavation program in layer vertically was 1.61, while the program in layer vertically and in section horizontally was 1.84, and the latter program was better. The top displacement of the wall increased mainly during the construction process, and the tension forces of the bolt did not change suddenly, and the wall and the soil behind the wall were stable. The soil reinforcement by the Soletanche method could enhance the soil shear strength and the resistance to deformation, and there was no collapse, fall, and slip during the construction process.

Key words: buried abutment, anchored retaining wall by tie rods, the Soletanche method, strength reduce method

中图分类号:

TU416

朱登元, 姚占勇, 葛守仁. 柱式桥台前坡改造数值分析与现场检测[J]. 山东大学学报(工学版), 2015, 45(3): 86-94.

ZHU Dengyuan, YAO Zhanyong, GE Shouren. Study on buried abutment slope transformation based on numerical simulation and site detections[J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2015, 45(3): 86-94.

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