This study investigates the use of glass fiber-reinforced polyester(GRP)pipe powder(PP)for improving the bearing capacity of sandy soils.After a series of direct share tests,the optimum PP addition for improving the b...This study investigates the use of glass fiber-reinforced polyester(GRP)pipe powder(PP)for improving the bearing capacity of sandy soils.After a series of direct share tests,the optimum PP addition for improving the bearing capacity of soils was found to be 12%.Then,using the optimum PP addition,the bearing capacity of the soil was estimated through a series of loading tests on a shallow foundation model placed in a test box.The bearing capacity of sandy soil was improved by up to 30.7%.The ratio of the depth of the PP-reinforced soil to the diameter of the foundation model(H/D)of 1.25 could sufficiently strengthen sandy soil when the optimum PP ratio was used.Microstructural analyses showed that the increase in the bearing capacity can be attributed to the chopped fibers in the PP and their multiaxial distribution in the soil.Besides improving the engineering properties of soils,using PP as an additive in soils would reduce the accumulation of the industrial waste,thus providing a twofold benefit.展开更多
珠江角有全国最软的软土,具有高含水率(30%~130%)、高压缩性(1.1~4.2)、低承载力(一般为35~60 k Pa)和深厚等特点,另外还有低渗透性、结构性、流变性、欠固结特性等特点。这些软土特性导致该地区进行基坑设计和施工难度大、造价高和工...珠江角有全国最软的软土,具有高含水率(30%~130%)、高压缩性(1.1~4.2)、低承载力(一般为35~60 k Pa)和深厚等特点,另外还有低渗透性、结构性、流变性、欠固结特性等特点。这些软土特性导致该地区进行基坑设计和施工难度大、造价高和工程事故常有发生的,尤其对于开挖在3~6 m范围内的浅基坑(一层地下室),由于开挖较浅容易被设计、施工和管理单位忽视,使得常发生失稳和局部滑移事故。针对深厚软土浅基坑的特殊性和工程实践中发现的问题,探讨了深厚软土浅基坑支护若干问题:1软土浅基坑常用支护形式及合理支护方案问题;2软土浅基坑失稳破坏模式分析;3软土浅基坑失稳破原因分析;4软土浅基坑被动区加固效果分析;5分析了具体失稳破坏浅基坑工程事故。以上若干问题的分析和探讨为设计浅基坑提供技术支撑,本文成果可为优化设计和施工提供了有益的参考,为类似工程提供借鉴。展开更多
基金This study was supported by the Polish National Agency for Academic Exchange under Grant No.PPI/APM/2019/1/00003.
文摘This study investigates the use of glass fiber-reinforced polyester(GRP)pipe powder(PP)for improving the bearing capacity of sandy soils.After a series of direct share tests,the optimum PP addition for improving the bearing capacity of soils was found to be 12%.Then,using the optimum PP addition,the bearing capacity of the soil was estimated through a series of loading tests on a shallow foundation model placed in a test box.The bearing capacity of sandy soil was improved by up to 30.7%.The ratio of the depth of the PP-reinforced soil to the diameter of the foundation model(H/D)of 1.25 could sufficiently strengthen sandy soil when the optimum PP ratio was used.Microstructural analyses showed that the increase in the bearing capacity can be attributed to the chopped fibers in the PP and their multiaxial distribution in the soil.Besides improving the engineering properties of soils,using PP as an additive in soils would reduce the accumulation of the industrial waste,thus providing a twofold benefit.
文摘珠江角有全国最软的软土,具有高含水率(30%~130%)、高压缩性(1.1~4.2)、低承载力(一般为35~60 k Pa)和深厚等特点,另外还有低渗透性、结构性、流变性、欠固结特性等特点。这些软土特性导致该地区进行基坑设计和施工难度大、造价高和工程事故常有发生的,尤其对于开挖在3~6 m范围内的浅基坑(一层地下室),由于开挖较浅容易被设计、施工和管理单位忽视,使得常发生失稳和局部滑移事故。针对深厚软土浅基坑的特殊性和工程实践中发现的问题,探讨了深厚软土浅基坑支护若干问题:1软土浅基坑常用支护形式及合理支护方案问题;2软土浅基坑失稳破坏模式分析;3软土浅基坑失稳破原因分析;4软土浅基坑被动区加固效果分析;5分析了具体失稳破坏浅基坑工程事故。以上若干问题的分析和探讨为设计浅基坑提供技术支撑,本文成果可为优化设计和施工提供了有益的参考,为类似工程提供借鉴。
