宝鸡市黄土工程边坡抗滑挡墙防治失效问题研究

RESEARCH ON FAILURE PROBLEM OF LOESS ENGINEERING SLOPE ANTI-SLIDING RETAINING WALL PREVENTION AND MITIGATION IN BAOJI CITY

论文基于对陕西省宝鸡市黄土工程边坡防护工程的系统调查测绘,针对普遍存在的抗滑挡墙防治失效问题进行了研究,提出了抗滑挡墙3种失效模式:黄土泥流越顶、墙体剪切破坏和挡墙"坐船随行"。以岭南滑坡抗滑挡墙防治失效为例,开展了黄土土力学测试,运用极限平衡法对滑坡推力进行了复核,分析了不同失效模式对应的成因机制。研究表明:(1)黄土工程边坡失稳多受工程切坡和降雨的双重影响。(2)坡面排水系统不完善、表层土体松散、降雨及坡体局部存在积水洼地是导致黄土泥流发生的主要影响因素;挡墙有效埋深不足是发生"坐船随行"的主因。(3)最后对解决黄土工程边坡抗滑挡墙失效问题进行了对策探讨。

Based on the system investigation and mapping of loess engineering slope protection in the areas of Baoji,Shanxi Province,the prevalent problem of prevention and mitigation failure of anti-sliding retaining wall is studied. In this paper,three anti-sliding retaining wall failure modes,loess mud over wall,shear failure and＂retaining wall traveling by ship＂,are put forward. To analyze the relationship between modes and different mechanisms,the authors conducted a loess soil mechanics test and calculated the landslide thrust using the limit equilibrium mehtod with the Lingnan landslide as an example. The results show that：（ 1） Both engineering slope cutting and rainfall cause slopes instability.（ 2） Imperfect slope drainage system,incompact surface soil,rainfall and local existence water depression are the leading cause of loess mud flow disaster. The burial depth of anti-sliding retaining wall foundation is the main reason of retaining wall traveling by ship.（ 3） Finally,the articlediscusses how to solve the problem of prevention and mitigation failure of anti-sliding retaining wall of loess engineering slope.