膨胀土地层具有深层裂隙发育的地质特征,导致膨胀土高边坡在开挖过程中出现边坡稳定问题。常用的加固或防护措施对膨胀土临时高边坡的变形适应能力较差,且经济性较低,新型预应力伞型锚加固技术是一种新的解决途径。针对鄂北地区水资源配置工程中膨胀土渠坡开挖过程中出现的工程问题,开展了预应力伞型锚加固膨胀土高边坡现场试验及应用推广评价。结果表明:预应力伞型锚施工快速且抗拔力大,可有效地控制边坡变形发展趋势、保证边坡临时稳定;结合推广应用段边坡的安全监测数据,验证了伞型锚在膨胀土临时边坡快速加固中具有较好的推广应用价值。

Expansive soil stratum is featured with deep fissure development which brings about stability problems to high slope of expansive soil in excavation process. Commonly used reinforcement or protective measures for temporary high slope of expansive soil are of poor adaptability and low economic benefit. Prestressed umbrella-shaped anchor is a new solution for the reinforcement of temporary expansive soil slope. In order to solve the stability problem in the excavation of expansive soil slope in Water Resources Allocation Project in North Hubei Province, we conducted field test of prestressed umbrella-shaped anchor and evaluated its popularization value in practical application. Research result demonstrates that prestressed umbrella-shaped anchor is of fast construction and large resistance against pull-out force, hence effectively controlling deformation development and ensuring slope stability. According to the safety monitoring data of slope, we verified that umbrella-shaped anchor is of good application and popularization values in the rapid reinforcement of expansive soil slope.