大型边坡加固技术的研究

随着国家大规模经济建设的展开,水利水电、交通、矿山、国防等工程建设中经常会遇到大型边坡的加固问题。以边坡规模、工程地质条件和工程重要性作为影响边坡加固方法选择的3类主要因素,并将其分别分解为3个级别,通过各因素之间不同级别的组合分级来确定边坡加固方案的初步选择。对于一些工程地质条件很差的重要边坡,现有的边坡加固方法存在一定的局限性和不足。为此,作者提出了可用于大型边坡加固的地下梁-桩框架结构体系。通过将桩和梁相互连接而构成的空间框架结构,该体系可以将稳定性不足的坡体与深部稳定岩体牢固地连结起来,进而可以充分发挥岩体的自支撑能力。该结构体系的实施不仅可以充分利用为其他目的而开挖的探洞、试验洞等已有洞体,而还可以轻易、高效地实现边坡的排水和监测。

RESEARCH ON REINFORCEMENT TECHNIQUE OF SLOP WITH LARGE DIMENSIONS

As the increasing economic developments in China, the reinforcements of large-size slopes are frequently encountered during the constructions of hydraulic and hydroelectric power, transportation, mining, and national defense projects. Three main factors influencing the choice of slope reinforcement methods, are chosen to be slope dimensions, engineering geological conditions and project importance, and classified by three grades. It is analyzed that present slope reinforcement methods have some limitations and defects for the reinforcement of important slope characterized by worse engineering geological conditions. For this reason, the authors have developed a new reinforcement method, i.e., underground beam-pile frame structure system. This system is applicable to the reinforcements of large-scale slopes. By connecting adjacent piles and beams, a spatial frame structure will be constructed. The slope parts with a lower stability can be closely jointed with stable rock masses in depth. This is helpful for exerting the self-sustaining capacity of the rock masses. Not only existent tunnels (e. g. investigation adits, testing tunnels) can be utilized for constructing the structure system, but also drainage and monitoring for slopes can be easily and efficiently realized.