Application method of composite sodium-based bentonite on construction of underground continuous wall

Abstract

The invention provides an application method of composite sodium-based bentonite on construction of an underground continuous wall, which takes the composite sodium-based bentonite as a material for preparing a wall-protection slurry and comprises the following process steps of: (1) preparing the wall-protection slurry by using the composite sodium-based bentonite, calcined soda and water and sufficiently mixing and storing the wall-protection slurry for standby; (2) during the trough-forming process of the underground continuous wall, filling the wall-protection slurry to be used into the trough section so as to carry out wall protection by slurry; (3) cleaning the hole after forming the trough; (4) repeatedly separating, purifying and detecting the slurry pumped out of the trough bottom during the cleaning-hole process; and (5) adjusting the qualified sands after separating the sand; subsequently repeatedly using the slurry; and abandoning the recycled slurry exceeding the index range. The wall-protection slurry prepared by the method has excellent wall-protection performance, slag-carrying capability and anti-pollution capability, can overcome the quality problems of the underground continuous wall such as collapse, settlement, exposed reinforcement, water leakage, and the like, thereby being suitable for all enclosure structures of the underground continuous walls, particularly the ultra-deep underground wall engineering with thicker sandy silts.

Description

Technical field: [0001] The invention relates to the application of a mud-water slurry material for construction engineering, in particular to a method for applying a novel composite sodium-based bentonite in the construction of an underground diaphragm wall, and belongs to the technical field of construction. Background technique: [0002] In the construction of tunnel engineering, the entrance and exit process of shield tunneling is the key process of tunnel construction by shield tunneling method. The quality of this process will directly affect the quality of the axis of the tunnel or pipeline after completion, the effect of environmental protection at the entrance and exit of the tunnel, and even affect the The success or failure of engineering construction. The tunnel entry and exit technology of the shield must be formulated according to the hydrogeology, environmental conditions and environmental protection requirements of the project. For the entry and exit tunnel s...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing underground diaphragm wall construction method using conventional bentonite mud as the retaining mud, and to provide an application method of composite sodium bentonite in underground diaphragm wall construction. Bentonite is used as the material of the wall retaining mud, and the process control of preparation and mixing, separation and purification, and mud recovery is strengthened during the construction process, so as to improve the wall retaining performance, slag-carrying ability and anti-pollution ability of the mud, so as to overcome the collapse of the underground continuous wall groove section, the wall Settlement, exposed reinforcement, water leakage and other quality problems to ensure the safety of foundation pit excavation

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