摘要
在砂卵砾石层进行地下连续墙施工时浆液漏失严重、槽壁垮塌频发、工程成本陡增,传统膨润土泥浆已很难满足工程要求。在理论分析的基础上进行试验研究,对天然粘土泥浆进行综合改性以研制新型护壁泥浆解决砂卵砾石层地连墙槽壁坍塌问题。通过优选试验确定基础改性剂CN-1以改善其悬浮稳定性问题,在此基础上进一步筛选得到提粘护胶剂(CG-14S)、协同封堵剂(DFD-2)对其综合性能指标进行改进,通过正交试验确定优化配方并进行性能与成本评价,同时分析了其改性过程与护壁机理,并进行了现场试验,最终研制出一种可应用于砂卵砾石层地连墙施工的改性粘土护壁泥浆,即15%天然粘土+0.2%CN-1+0.4‰CG-14S+0.5‰DFD-2。研究成果为解决复杂地层地连墙施工槽壁垮塌问题提供了新的选择。
The traditional bentonite mud can hardly meet the engineering requirements because of serious slurry leakage,frequent trench side collapse,and highly increased construction cost.On the basis of theoretical analysis,experimental research was carried out to develop a new type of trench side protection mud by comprehensive modification of natural clay mud to solve the problem of trench side collapse in sand,gravel,and boulder layers.The basic modifier CN-1 was determined through the optimization test to improve its suspension stability.On this basis,the adhesive lifting agent(CG-14S)and the cooperative plugging agent(DFD-2)were further obtained through optimization to improve its comprehensive performance index.The optimized formula was determined by orthogonal test,and the performance and cost evaluation was carried out.Field tests were conducted,and a modified clay mud for trench side protection was finally developed.It is made up of 15%natural clay+0.2%CN-1+0.4‰CG-14S+0.5‰DFD-2,and can be used in the construction of the diaphragm wall in gravel and boulder layers.The research results provide an option for solving the problem of trench side collapse in the construction of the diaphragm wall in complex strata.
作者
周昌军
何烨
解程超
王胜
何鑫
唐庆东
李守信
ZHOU Changjun;HE Ye;XIE Chengchao;WANG Sheng;HE Xin;TANG Qingdong;LI Shouxin(Chengdu Hydroelectricity Construction Engineering Co.,Ltd of Sinohydro Bureau No.7 Company,Chengdu Shichun 611130,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu Shichun 610059,China)
出处
《钻探工程》
2023年第2期91-98,共8页
Drilling Engineering
基金
中国水利水电第七工程局有限公司科技项目“富水砂卵砾石层防渗墙垮塌机制与泥水平衡稳壁技术研究”(编号:2021-749-59-53)。
