钻遇复杂溶洞群注浆处置材料室内试验研究

Indoor experimental study of grouting and disposal materials for drilling complex cavern clusters

摘要:

以潇水某盾构掘进工程段为案例，研究解决岩溶地质条件下注浆材料配比的关键问题。在试验前期使用粘土、砂石和水泥等原料开展了一系列预实验，在此基础上通过就地取土的方式进行膏浆配比因素的正交试验。试验结果表明，干土和水胶比是对膏浆抗压强度影响最大的因素；膏浆坍落度的主要影响因素是水胶比，而干土和砂的掺量对坍落度的贡献相当；在抗压强度方面，贡献度依次为水胶比>干土>砂。综合考虑膏浆性能参数和经济性，建议选用6号（A2B1C3）膏浆作为本次施工的填充注浆材料。研究结果表明，利用施工现场的粘土和机制砂制备膏浆可以满足设计院对岩溶填充材料的性能指标要求。

关键词:注浆工程;注浆材料;溶洞群;膏浆配比;盾构施工

Abstract:

Taking a shield tunneling project section in Xiaoshui as a case study， research was conducted to solve the key problem of the proportioning of grouting materials under karst geological conditions. A series of pre-tests were carried out in the pre-test period using raw materials such as clay， sand， gravel and cement， on the basis of which orthogonal tests on the factors of paste slurry proportioning were carried out by means of in situ soil extraction. The test results show that the dry clay and water-cement ratio are the factors that have the greatest influence on the compressive strength of the paste； The main influencing factor of the slump of the paste is the water-cement ratio， and the mixing amount of dry clay and sand contributes to the slump quite a lot； In terms of the compressive strength， the degree of contribution is in the order of the water-cement ratio>dry clay>sand. Considering the performance parameters and economy of paste slurry， it is recommended to choose No.6 （A2B1C3） paste slurry as the filling grouting material for this construction. The results of the study show that the preparation of paste slurry using clay and mechanism sand from the construction site can meet the requirements of the Design Institute for the performance index of karst filling materials.

Key words:grouting engineering;grouting material;cavern clusters;paste slurry proportioning;shield tunneling