气泡混合轻质土在奥运通道中填土减荷的工程实践

研究目的：探讨气泡混合轻质土的设计及施工等方面的问题。研究方法：通过北京奥林匹克公园地下通道气泡混合轻质土的工程实践，介绍了气泡混合轻质土的基本特性、填土减荷设计、配合比参数、关键工艺、质量控制及检测技术，并对工程实测结果进行了分析。研究结果：利用气泡混合轻质土填土减荷效果良好，其容重在浸水条件下虽有较大增加，但没有超过设计要求范围，满足了通道设计荷载要求。研究结论：利用气泡混合轻质土的轻质性进行减荷设计，效果明显，气泡混合轻质土用于地面的下基坑等回填时，亦适用于地下水浸泡范围内的填土，有着非常广泛的应用前景和社会效益。

Construction Practice of Filling Olympic Corridor with Bubble Mixed Light Soil for Reduction of Load

Research purposes: The purposes are to make an exploration on the issues related to the design and construction of filling the corridor with bubble mixed light soil.Research methods:Through the construction practice of filling the underground corridor of Beijing Olympic Park with bubble mixed light soil,the inductions are given to the basic characteristics of bubble mixed light soil,design of filling soil for reduction of load,parameters of mixture ratio,key techniques,quality control and test technology,and the analysis is made for the tested results.Research results:It has a good result to use bubble mixed light soil for reduction of load.Although the volume-weight of the soil under submerging increases much,but it does not exceed the design range and meets the requirement of corridor design load.Research conclusions:It has a perfect achievement to use bubble mixed light soil for reduction of load and has a wide applicable prospect and social benefits when bubble mixed light soil is used for filling surface lower foundation ditch,including filling soil to the area submerged by underwater.