受空洞坍塌影响的加筋路基研究综述

工程上常利用水平加筋法来预防或延迟因受交通荷载和地下水等因素导致空洞坍塌而引起的临近道路的突发性破坏，起到破坏预警作用；但加筋体界面特性与作用机制相当复杂，下伏空洞加筋路基缺少完善的设计方法。通过总结国内外已有文献的研究成果，重点阐述了受空洞坍塌影响的加筋路基-路堤力学机制与作用机制，包括对路堤填土滑移面的定义、层间土拱效应、加筋体拉膜效应、塌陷区上覆填土膨胀、锚固区筋土界面摩擦及过渡区加筋体张拉力折减等方面；总结了空洞区加筋路基已有的设计方法，并进行了对比与讨论。结果表明，已有成果对受空洞坍塌影响的加筋路基-路堤荷载传递机制、渐进性破坏演变机制、沉降计算、极限承载力与稳定性问题等方面的研究仍显不足，针对加筋体上方荷载分布形式仍未形成定论，现有设计方法过于保守，并指明了进一步的研究建议，可为今后研究提供方向和参考。

State of the art in research of geosynthetic-reinforced embankment overlying voids

Horizontal reinforcement solutions are generally used in pavement engineering to prevent or delay the sudden damage of adjacent roads caused by collapse of cavities induced by vehicle loads and ground water, and to provide an early warning. This kind of approach is extensively adopted in many countries, but load transfer mechanisms and characteristics of the interfaces between the geosynthetics and soils are not yet fully understood. This study presents an review of the state of the art for the geosynthetic-reinforced embankment overlying voids. The mechanical mechanisms (e.g. sliding surfaces of the embankment fills, arching theory, membrane effect, soil expansion over the geosynthetics, friction in anchorage areas and reduction of tensions in the transition areas) are mainly introduced. The comparisons and shortcomings of the design methods are also discussed. To improve the design methods, the several mechanical behaviors of prior literatures need to be further investigated: load transfer mechanisms, delayed deformation and collapse due to the geosythetics, settlement calculation, ultimate bearing capacity and stability of the embankment subjected to localized voids. The load distributions have not been revealed, the exiting design methods are overly conservative. A set of recommendations and insights is presented for further researches.