CN-122010508-A - Nano-excitation fluid-state solidified soil based on drilling slag soil, and preparation method and application thereof

CN122010508ACN 122010508 ACN122010508 ACN 122010508ACN-122010508-A

Abstract

The invention discloses nano-excited fluid state solidified soil based on drilling slag soil, which is formed by mixing drilling slag soil slurry and a solidifying agent, wherein the mixing amount of the solidifying agent is 6-12% of the weight of the drilling slag soil slurry, the drilling slag soil slurry is formed by mixing drilling slag soil and water, the solidifying agent comprises, by weight, 85-92% of sulphoaluminate cement, 0.3-1.0% of underwater non-dispersing agent, 0.5-2.0% of nano early strength agent and 5-10% of active mineral admixture, the nano early strength agent is nano C-S-H nucleating agent or nano lithium carbonate with the particle size less than or equal to 100nm, the 1d strength of the fluid state solidified soil can reach 180kPa, the 2d strength is more than or equal to 150kPa, the early strength of the conventional solidified soil is improved by more than 80%, the rotary drilling rig is shortened to 24-48H, and the construction efficiency is greatly improved.

Inventors

ZHAN WEN
TANG KAI
LUO LIPING
CHEN SHAOLIN
TANG XIAO
Shen Erbo
HU XINGLONG
SUN YUQIU

Assignees

中交二航武汉港湾新材料有限公司
中交武汉港湾工程设计研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20251231

Claims (8)

1. The nano-excited fluid state solidified soil based on the drilling slag soil is characterized by being formed by mixing drilling slag soil slurry and a curing agent, wherein the mixing amount of the curing agent is 6% -12% of the weight of the drilling slag soil slurry; wherein the curing agent comprises 85 to 92 weight percent of sulphoaluminate cement, 0.3 to 1.0 weight percent of underwater non-dispersant, 0.5 to 2.0 weight percent of nano early strength agent and 5 to 15 weight percent of active mineral admixture; The nanometer early strength agent is a nanometer C-S-H nucleating agent or nanometer lithium carbonate with the grain diameter less than or equal to 100 nm.
2. The nano-excited fluidized solidified soil based on drilling slag soil according to claim 1, wherein the initial fluidity of the fluidized solidified soil is 250-300 mm, no obvious dispersion exists in the process of underwater soaking for 72 hours, 2d unconfined compressive strength is greater than or equal to 150kPa, and 28d unconfined compressive strength is greater than or equal to 250kPa.
3. The nano-excited fluidized solidified soil based on drilling slag soil of claim 1, wherein the particle size of the nano-C-S-H nucleating agent is 20-50nm and the particle size of the nano-lithium carbonate is 50-100nm.
4. The nano-excited fluidized bed soil based on drilling slag soil according to claim 1, wherein the underwater non-dispersant is hydrophobic-associated polyacrylamide or a compound of hydroxyethyl methylcellulose and partially hydrolyzed polyacrylamide in a compound ratio of 1:1-2:1.
5. The nano-excited fluidized solid soil based on drilling muck of claim 1, wherein the drilling muck slurry has a specific gravity of 1.45-1.50 Sand content is less than or equal to 5 percent, gel content is more than or equal to 95 percent, the grain diameter of the drilling slag soil is less than or equal to 40mm.
6. The borehole slag based nano-excited fluidized bed soil of claim 1, wherein said reactive mineral admixture is class I fly ash or S95 slag powder.
7. A method for preparing nano-excited fluid state solidified soil based on drilling slag as claimed in any one of claims 1-6, comprising the steps of: s1, raw material preparation Collecting drilling slag generated by processing the boulder by rotary drilling, and mixing the sulphoaluminate cement, the underwater non-dispersant, the nano early strength agent and the active mineral admixture according to a proportion to obtain a curing agent for standby; S2, pulping Mixing drilling slag soil and water in proportion to prepare homogeneous drilling slag soil slurry; S3, mixing and stirring And stirring and mixing the drilling slag soil slurry and the curing agent to form the non-segregation and non-caking fluid state cured soil.
8. A method for backfilling a rotary excavation hole by shield tunneling boulder treatment, which is characterized by adopting the fluid solidified soil according to any one of claims 1-6, and comprising the following steps: Step 1, perfusion catheter layout Placing a perfusion catheter in the rotary drilling hole, keeping the bottom opening of the perfusion catheter 300-500 mm away from the bottom of the hole, and connecting the catheter joint in a sealing type quick connection manner; Step 2, continuous pouring Continuously pumping the fluid solidified soil into a pouring guide pipe, and pouring for the first time to ensure that the bottom end of the pouring guide pipe is buried below the solidified soil surface to be more than or equal to 0.8m, controlling the burying depth of the pouring guide pipe to be 2-6 m in the pouring process, matching the pulling speed with the pouring speed, and controlling the pulling speed to be 0.5-1 m/h until the pouring guide pipe is poured to be 500mm above the designed elevation of the orifice; step 3, orifice treatment And (5) removing the orifice slurry within 24 hours after the pouring is finished, and trimming to the designed elevation.

Description

Nano-excitation fluid-state solidified soil based on drilling slag soil, and preparation method and application thereof Technical Field The invention relates to the field of fluid-state solidified soil. More particularly, the invention relates to nano-excited fluid state solidified soil based on drilling slag soil, and a preparation method and application thereof. Background The shield tunneling construction method is increasingly widely applied to rail transit and underground railway engineering, and the construction safety, tunneling efficiency and shield attitude control are directly related to geological conditions. The boulders commonly distributed in coastal granite stratum randomly develop in residual soil, fully weathered/strong weathered granite and a small amount of slope soil, and the problems of line deviation, cutter abrasion and the like easily occur when a shield passes through, and the problems need to be accurately positioned and broken step by a rotary drilling rig. The rotary drilling process can generate a large amount of waste residue soil (containing silt, clay and the like), the traditional disposal mode is external transportation landfill, the cost is increased, the environment-friendly pressure exists, and meanwhile, the drilling depth is more below the groundwater level, and the formed holes need to be backfilled to ensure the safety of the subsequent tunneling of the shield. The traditional backfill material (common mortar and underwater concrete) has three core pain points, ① is easy to disperse and isolate under water, strict process control is needed, ② is long in setting time (the 7d strength of common cement-based material is less than 100 kPa), so that a rotary drilling rig cannot quickly transfer, the construction period is prolonged, the core sign of ③ is that the cement hydration reaction rate is slow, an efficient excitation mechanism is lacked, and the engineering requirement of 'forming a stable tunnel face rapidly' is difficult to meet. In the existing improvement scheme, the conventional soil curing agent has no underwater anti-dispersion capability, the common early strength agent (such as calcium chloride) has limited lifting effect and is easy to cause durability problem, and the comprehensive requirements of 'underwater stability, quick hardening early strength, waste utilization and cost controllability' can not be simultaneously solved. Disclosure of Invention To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a preferred embodiment of the present invention provides a nano-excited fluidized bed soil based on a borehole slag slurry, which is mixed with a solidifying agent in an amount of 6% -12% by weight of the borehole slag slurry, the borehole slag slurry being mixed with water; wherein the curing agent comprises 85 to 92 weight percent of sulphoaluminate cement, 0.3 to 1.0 weight percent of underwater non-dispersant, 0.5 to 2.0 weight percent of nano early strength agent and 5 to 15 weight percent of active mineral admixture; The nanometer early strength agent is a nanometer C-S-H nucleating agent or nanometer lithium carbonate with the grain diameter less than or equal to 100 nm. Preferably, the initial fluidity of the fluid-state solidified soil is 250-300 mm, no obvious dispersion exists when the fluid-state solidified soil is immersed under water for 72 hours, the 2d unconfined compressive strength is more than or equal to 150kPa, and the 28d unconfined compressive strength is more than or equal to 250kPa. Preferably, the particle size of the nano C-S-H nucleating agent is 20-50nm, and the particle size of the nano lithium carbonate is 50-100nm. Preferably, the underwater non-dispersing agent is hydrophobic-associated polyacrylamide or a compound of hydroxyethyl methylcellulose and partially hydrolyzed polyacrylamide in a compound ratio of 1:1-2:1. Preferably, the specific gravity of the drilling slag mud is 1.45-1.50Sand content is less than or equal to 5 percent, gel content is more than or equal to 95 percent, the grain diameter of the drilling slag soil is less than or equal to 40mm. Preferably, the active mineral admixture is class I fly ash or S95 slag powder. In another aspect, a preferred embodiment of the present invention provides a method for preparing the nano-excited fluidized solidified soil based on drilling slag, comprising the steps of: s1, raw material preparation Collecting drilling slag generated by processing the boulder by rotary drilling, and mixing the sulphoaluminate cement, the underwater non-dispersant, the nano early strength agent and the active mineral admixture according to a proportion to obtain a curing agent for standby; S2, pulping Mixing drilling slag soil and water in proportion to prepare homogeneous drilling slag soil slurry; S3, mixing and stirring And stirring and mixing the drilling slag soil slurry and the curing agent to f