|
|
|
| Experimental study on reusing soil dug by EPB shield from clay layer to synchronous grouting |
| QIAN Xin1, GUAN Chao1, CHEN Yiyuan1, LING Fanlin2*, WANG Shuying2
|
1. Communications Engineering Construction Branch of CCCC, the Third Harbor Engineering Co., Ltd., Shanghai 200940, China;
2. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China |
|
|
|
|
Abstract In order to solve the problem of EPB(earth pressure balance)shield muck accumulation and transportation impact on the urban environment, relying on the shield tunnel project in a work area of Hangzhou Metro Line 10, for the clay soil layer, the shield muck reuse was proposed as synchronous grouting material. In the scheme, the slurry performance was tested by uniform test method. Linear regression and single factor analysis were performed on the test results. Among them, the 28 d compressive strength and the 2 d hardening rate were both increased significantly with the increase of the proportion of muck, while the 3 h bleeding rate decreased accordingly. It was found that when the water-binder mass ratio was 0.65, the cement-sand mass ratio was 0.7, the residue mass fraction was 5%, and the cement mass fraction was 30%, all the parameters of the slurry met the requirements. The influence of each factor on the key performance indicators of the slurry was explored to provide a new idea for the reuse of earth pressure balance shield muck.
|
|
Published: 07 July 2020
|
|
|
|
|
|
|
|
