顶管废弃渣土作为城市管网建设的副产品，具有体量大、区域性强、成分复杂等特点，且由于其内部含有表面活性成分，导致顶管废土不易排水固结，制约了废土资源的再利用。为解决该问题，利用黄冈城区地下综合管廊顶管施工所产生的废土为原材料制备自密实顶管废土——可控低强度材料（CLSM），并通过控制水固比、灰土比以及粉煤灰与水泥的比值（F/C）等因素，研究其流动性、泌水率以及抗压强度的变化规律。试验结果表明： 1）水固比对于CLSM的流动性变化起到主要作用，而抗压强度随着F/C的增大而减小，随着灰土比的增大而增大； 2）通过控制水固比、灰土比以及F/C，能够制备出流动性在100～200 mm、泌水率小于3%、抗压强度在0.35～0.7 MPa的自密实、高流动性材料，满足沟槽回填过程中对于工作性能以及强度的相关要求。

As a byproduct of urban pipe network construction, pipe jacking waste soil is characterized by large volume, strong regionallity, and complex composition. The pipe jacking waste soil is not easy to drain and consolidate due to its surface active ingredients, which restricts the refuse of waste soil resources. To address these problems, the waste soil generated by the pipe jacking construction of the underground comprehensive utility in Huanggang is used as raw materials to prepare selfcompacted pipe jacking controlled low strength materials (CLSM), and the change laws of its fluidity, bleeding rate, and compressive strength are studied by controlling the watersolid ratio, the cement to waste soil quality ratio, and the fly ash to cement (F/C) ratio. The test results show the following: (1) The watersolid ratio plays a major role in the fluidity change of CLSM, while the compressive strength decreases with the increase of F/C, and increases with an increase in cement to waste soil quality ratio. (2) By controlling the watersolid ratio, the cement to waste soil quality ratio, and F/C ratio, selfcompacting and highfluidity materials with fluidity of 100~200 mm, bleeding rate of less than 3%, and compressive strength of 0.35~0.7 MPa can be prepared, which meets the requirements of the trench backfilling process in terms of working performance and strength.