锚固植被加强系统对新开挖膨胀土边坡大气影响深度的作用

[目的]探索锚固加强植被系统(ARVS系统)对新开挖膨胀土边坡大气影响深度的影响，为该系统防护新开挖膨胀土边坡的应用提供参考依据。[方法]以南宁市膨胀土边坡为研究对象，进行新开挖的裸露边坡、植草边坡、ARVS系统防护边坡的现场试验，监测边坡的土体含水率、土体温度、锚杆轴力，研究大气作用下ARVS系统对新开挖膨胀土边坡的大气影响的深度。[结果]裸露边坡的大气影响深度发展最快，短时间内就能发展到了2.4 m左右，ARVS系统防护边坡的发展最慢，多次降雨后，大气影响深度小于1.8 m; ARVS系统能约束膨胀作用，限制胀缩裂隙的发育，再加上植被作用，减缓大气影响深度向内部发展的速度；随着大气影响深度向土体深部发展，中性点向深处移动，坡面的植被与高性能植被保护垫(HPTRM)能使限制这种移动，保证ARVS系统约束膨胀作用的能力。[结论] ARVS系统的植被，HPTRM和锚杆3者相互作用，通过约束膨胀作用来限制新开挖膨胀土边坡大气影响深度的发展。

Effects on Atmospheric Influence Depth for an Anchored Vegetation Reinforcement System to Protect Newly Excavated Expansive Soil Slopes

[Objective] The data that could provide a reference basis for the application of an anchor-reinforced vegetation system (ARVS) were obtained to protect newly excavated slopes with expansive soil.[Methods] Field tests were conducted on a newly excavated bare slope, vegetated slope, and ARVS-protected slope of expansive soil in Nanning City. Soil moisture content, soil temperature, and anchor shaft force of the slope were monitored to study the depth of atmospheric influence of ARVS on a newly excavated expansive soil slope under atmospheric action.[Results] The depth of atmospheric influence on the bare slope developed the fastest, developing to about 2.4 m in a short time. The depth of atmospheric influence on the ARVS-protected slope developed the slowest. The depth of atmospheric influence was less than 1.8 m after repeated rainfall events. ARVS restrained the expansive effect and limited the development of expansive and shrinking fissures, together with vegetation and high performance turf reinforcement mats (HPTRM), ARVS slowed down the development of the depth of atmospheric influence to the interior. As the depth of atmospheric influence developed to the deep part of the soil body, the neutral point moved deeper.[Conclusion] The vegetation, HPTRM, and anchor rod of ARVS interacted with each other to limit the development of atmospheric influence depth on a newly excavated expansive soil slope by restraining the expansive effect.