基于静力模型试验的华丽高速公路金沙江桥华坪岸顺层边坡安全性评估

发布时间：2018-01-13 18:04

本文关键词：基于静力模型试验的华丽高速公路金沙江桥华坪岸顺层边坡安全性评估　出处：《岩石力学与工程学报》2017年05期 　论文类型：期刊论文

【摘要】：顺层边坡的破坏范围及稳定性一般受工程扰动影响较大。以华丽金沙江桥华坪岸顺层边坡为研究对象,利用现场调查、地质力学方法和数值分析,综合确定华坪岸边坡破坏模式主要为后缘陡倾结构面控制剪入+T2凝灰岩软弱夹层主滑+前缘缓倾结构面剪出破坏控制。基于此,制作考虑后缘陡倾结构面和顺层软弱夹层边坡模型,设计了不同桥基荷载和水平荷载组合工况,分析余推力、位移、应力和应变发现:不同工况临界水平荷载为1.89~3.15 k N,临界水平地震加速度值为0.134 g~0.208 g,除100 a设防自然工况不满足外,其余条件下华坪岸边坡均满足工程区修正后地震设防标准0.105 g(50 a)和0.144 g(100 a)的要求。在模型试验过程中,数据的灵敏度和稳定性排序为表观应力和位移内部应力应变;传感器的费效比排序为量力环百分表土压力盒应变片。
[Abstract]:The failure range and stability of bedding slope are generally affected by engineering disturbance. Taking Huaping bank slope of Jinsha River Bridge as research object, field investigation, geomechanical method and numerical analysis are used. It is determined synthetically that the failure mode of bank slope in Huaping is mainly controlled by the structural plane of steep slope in the rear edge, which is controlled by cutting through the main slip front of the weak intercalation of T2 tuff, and the shear failure control is based on this. Based on the model of steep tilting structural plane and soft intercalation slope, different load combinations of bridge foundation and horizontal load are designed, and the residual thrust and displacement are analyzed. The results of stress and strain show that the critical horizontal load is 1.89 ~ 3.15 KN and the critical horizontal earthquake acceleration is 0.134 g / m ~ (0.208) g under different working conditions. Except 100a, the natural condition of fortification is not satisfied. Under other conditions, the slope of Huaping bank can meet the requirements of the revised seismic fortification standard 0.105 g ~ (50 a) and 0.144 g ~ (100 a) in the course of model test. The order of sensitivity and stability of the data is apparent stress and internal stress and strain of displacement. The cost-effectiveness ratio of the sensor is the strain gauge of the earth pressure box.
【作者单位】：云南省交通规划设计研究院陆地交通气象灾害防治技术国家工程实验室;中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室;重庆大学土木工程学院;中国科学院大学;
【基金】：云南省交通科技项目(云交科2014(A)01) 国家自然科学基金云南联合基金重点支持项目(U1402231) 国家自然科学基金资助项目(51608518)~~
【分类号】：U416.14
【正文快照】： 顺层边坡是一类具有典型缓倾地层结构或者控制性缓倾结构结构面的斜坡地形,其破坏模式和稳定性均受“顺层”的影响,特点鲜明,常见于沉积地层发育地区。由于其破坏的范围、破坏的剧烈程度和稳定性受开挖坡面与顺层面的空间关系影响较大,所以工程实践中很受关注,其安全问题值得

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