Abstract
This paper performs an extensive literature survey and example investigation on the stabilisation of slurry wall trenches during the construction of diaphragm wall panel trenches, and the failure modes of slurry wall trench instability, the stability theoretical analysis models and methods, the slurry formation and its protection mechanism, the influence of related factors on slurry wall trench stabilisation, and other related problems are summarized and analyzed emphatically. And then, based on the limit equilibrium analysis method, the mechanical models of the overall stability and local stability of the trench wall are established, respectively, and the design method of slurry unit weight is derived to ensure the stability of the trench wall. Furthermore, an example application shows that the established slurry unit weight design method is reliable. At last, this paper also proposes the focus and direction for follow-up work, that is, to construct an accurate and effective theoretical analysis model of slurry wall trench instability considering the influence of multiple factors and the calculation method of the slurry cake and its mechanical or mathematical relationship with slurry quality.
Highlights
Diaphragm wall panel trenches are continuous underground walls with seepage proof, waterproof, and retaining and bearing functions that are formed by using digging machines to excavate narrow and deep grooves underground and pour materials inside with the help of a slurry wall [1]
Many scholars believe that the diaphragm wall panel trench instability modes can be divided into overall instability and local instability (Figure 1). e slurry wall trench instability for soft ground with a certain bonding property is reflected in the global sliding, whilst that for a weak interlayer with weak or without bonding property is mainly reflected in the local instability of the spot scale off
Based on the above formula, the horizontal stress produced in the soil increases along with the shear strength of the slurry gel and the stability of the groove hole. erefore, high-quality slurry must be used in practice. e slurry consistency increases to gain a certain shear strength, whilst the gelling action increases to improve the stability of the slurry wall trench
Summary
Diaphragm wall panel trenches are continuous underground walls with seepage proof, waterproof, and retaining and bearing functions that are formed by using digging machines to excavate narrow and deep grooves underground and pour materials inside with the help of a slurry wall [1]. Originated from Europe, the diaphragm wall panel trench excavation technology has been developed using the slurry and underwater concreting method for oil drilling [2]. E quality of the wall protection slurry, the mechanism of the slurry, and the influence of relative factors on slurry wall trench stability during the construction of a diaphragm wall panel trench must be understood as they directly affect the safety of the project. Erefore, this paper examines the issues related to the stability of these trenches by performing an extensive literature review and emphasizes the diaphragm wall panel trench instability failure modes, the computation method, the slurry wall protection mechanism, and the relative factors that affect slurry wall trench stability to provide a valuable reference for follow-up studies and engineering applications Ese accidents can be attributed to the defects in the quality of the wall protection slurry (i.e., uniformity and specific gravity) and the changes in the underwater level. e quality of the wall protection slurry, the mechanism of the slurry, and the influence of relative factors on slurry wall trench stability during the construction of a diaphragm wall panel trench must be understood as they directly affect the safety of the project. erefore, this paper examines the issues related to the stability of these trenches by performing an extensive literature review and emphasizes the diaphragm wall panel trench instability failure modes, the computation method, the slurry wall protection mechanism, and the relative factors that affect slurry wall trench stability to provide a valuable reference for follow-up studies and engineering applications
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