Preparation method of mechanical rotary drilling pile wall-retaining slurry

Abstract

The invention discloses a preparation method of mechanical rotary drilling pile wall-retaining slurry. The method is characterized by comprising the following steps: a, using a main material of a pulping agent having excitation expansion performance and main component SiO2 to prepare powder, performing uniform stirring, and allowing the stirred material to stand for 1-2 days for homogenization toform a uniform pulping material; b, adding an excitant and a swelling agent into the pulping material obtained in the step a, performing uniform mixing, adding water, and performing mixing under stirring to complete excitation and expansion of the main material of the pulping agent; and c, adding a dispersant, a tackifying agent, a thickening agent and a water retaining agent as auxiliary materials, and performing uniform mixing under stirring to prepare the wall retaining slurry. According to the preparation method provided by the invention, the wall retaining slurry prepared by the method has the advantages of better quality, lower preparation costs and better self-consolidation performance.

Description

technical field [0001] The invention belongs to the technical field of wall protection mud, and in particular relates to a method for preparing wall protection mud of mechanical rotary excavation piles. Background technique [0002] At present, bentonite is still the first choice for domestic preparation of retaining mud, especially when forming holes in soft soil foundations, the excellent slurry-making performance of bentonite strongly guarantees the safety of hole formation in wet operations. However, in order to reduce construction costs and utilize local materials, some projects use clay mixed with organic polymers such as polyacrylamide (PHP) and carboxymethyl cellulose (CMC) to prepare wall retaining mud, which has achieved good engineering application results. When clay is used as a pulping material, higher requirements are put forward for the content of montmorillonite, pulping rate, sand content, and plasticity index in the clay. Moreover, since the pulping rate of...

AI Technical Summary

Problems solved by technology

[0003] Analyzing the research and application status of retaining mud, the problems in the preparation and application of retaining mud are as follows: 1. The cost of preparing retaining mud with bentonite is high; as a mineral, bentonite has regional distribution, and currently many regions in China do not produce bentonite , the use of bentonite to prepare wall protection mud needs to be purchased from other places, and the increase in transportation distance also leads to an increase in the price of bentonite, which leads to an increase in the preparation cost of wall protection mud

2. Using clay to prepare wall protection mud has a high sand content; using clay instead of bentonite to prepare wall protection mud can significantly reduce the preparation cost, but it also leads to increased sand content and lower viscosity of the mud, which also affects the stability of the mud

3. The viscosity and relative density of the retaining mud are low. The relative density of the slurry is low when using clay and bentonite to compound the preparation of the retaining mud. In order to increase the relative density of the slurry, it is usually necessary to add raw materials with higher densities such as barite, resulting in Performance indicators such as slurry viscosity decrease

4. The recycling rate of retaining mud is low; using cementitious materials with hydration hardening characteristics to prepare retaining mud can improve the consolidation ability of the slurry, but the stability of the slurry is also reduced due to the continuous hydration of the cementitious material in the mud , the recycling rate is significantly reduced

The accumulation of high-calcium and high-sulfur coal ash will cause environmental pollution problems such as soil pollution and water pollution.