摘要
为了确保山区公路高边坡施工和运营的安全性,结合G342公路改扩建工程,采用GNSS和传统大地测量法相结合的监测手段,并选择代表性的监测点位,制定了一套敏感、高效、针对性的高边坡监测方案,同时利用GNSS、静力水准仪、串联式测斜仪等工具构建了山区高边坡监测预警体系。通过地表位移、深部位移、地表沉降实时监测数据的分析研究可知,水平地表位移无明显变化,竖向地表位移随着边坡高程的增大而减小,边坡滑移段处于二级平台以上;深部水平位移累计变形量整体上在可控范围内,稳定性相对较好;在距一级平台深度为9~11 m的范围内,存在边坡滑动面,因此将其作为后期边坡监测的重点,同时加强对该区域的加固与防护;地表沉降在前期变化速率最大,相对沉降高度也较大,随着时间的推移,沉降变化逐渐缓慢,沉降量也逐渐稳定。此外,高边坡中间位置与预测滑移带较近,因此相对于两侧,中间位置的沉降变化较大,但整体在可控范围内。
In order to ensure the safety of high slope construction and operation of mountain highways,combined with the G342 highway reconstruction project,a sensitive,efficient and targeted high slope monitoring plan was devel-oped by a monitoring method combining GNSS with traditional geodetic surveying and representative monitoring points.At the same time,GNSS,a monitoring and warning system for mountain high slopes was constructed by static level and series inclinometer.Through the analysis and research of real-time monitoring data of surface displace-ment,deep displacement and surface settlement,it can be concluded that there is no significant change in horizontal surface displacement,while vertical one decreases with the increase of slope elevation.The sliding section of the slope was above the second level platform;The cumulative deformation of deep horizontal displacement was gener-ally within a controllable range and had relatively better stability;Within a depth range of 9~11 meters from the first level platform,there was a sliding surface of the slope.So it was the focus of later slope monitoring.The rein-forcement and protection were strengthened in the area;Surface subsidence had the highest rate of change in early stage,and the relative subsidence height was also relatively larger.Over time,the subsidence changes gradually slew down and the subsidence amount gradually stabilized.In addition,the middle position of the high slope was relatively closer to the predicted slip zone.Compared with the two sides,the settlement change in the middle position was relatively larger,but the whole settlement was within a controllable range.
作者
梁慧
葛玉伟
Liang Hui;Ge Yuwei(Shaanci Huashan Road and Bridge Group Co.,Ltd.,Xi'an 710016,China;Shaanxi Zhengcheng Road and Bridge Engineering Research Institute Co,Ltd,Xi'an 710086,China)
出处
《市政技术》
2023年第12期168-173,187,共7页
Journal of Municipal Technology
关键词
山区公路
高边坡
稳定性
施工
变形监测
mountain highways
high slope
stability
construction
deformation monitoring
