阅读说明：本技术 一种软弱地层隧道超前深孔注浆加固材料及其制备方法 (Weak stratum tunnel advanced deep hole grouting reinforcement material and preparation method thereof ) 是由 王庆磊 于 2019-11-29 设计创作，主要内容包括：本发明公开了一种软弱地层隧道超前深孔注浆加固材料及其制备方法,属于注浆材料技术领域,由以下重量份数的原料制成：水泥300-500份、建筑废弃沙石200-300份、粉煤灰150-250份、氯化钙50-80份、水玻璃60-90份、羟甲基纤维素40-60份、水400-600份；本发明添加氯化钙和水玻璃,生成凝胶体,提高了材料体系的凝胶性能,且添加羟甲基纤维素,进一步提高体系粘度,上述组分能够在浆料体系中形成相互作用的网络结构,材料被注入之后能够快速凝结,阻止了外界水分的侵入,从而提高整个浆料体系的抗分散性能；以建筑废弃沙石和粉煤灰辅助水泥,减少了水泥的使用量,变废为宝,经济且环保。(The invention discloses a soft stratum tunnel advanced deep hole grouting reinforcement material and a preparation method thereof, belonging to the technical field of grouting materials and being prepared from the following raw materials in parts by weight: 500 portions of cement, 300 portions of waste building sand, 300 portions of 200 portions of waste building sand, 250 portions of fly ash, 50 to 80 portions of calcium chloride, 60 to 90 portions of water glass, 40 to 60 portions of hydroxymethyl cellulose and 600 portions of water; according to the invention, calcium chloride and water glass are added to generate gel, so that the gel property of a material system is improved, and hydroxymethyl cellulose is added to further improve the viscosity of the system, the components can form an interactive network structure in a slurry system, and the material can be quickly condensed after being injected, so that the invasion of external moisture is prevented, and the anti-dispersion property of the whole slurry system is improved; the cement is assisted by the building waste sand and stone and the fly ash, so that the use amount of the cement is reduced, waste materials are changed into things of value, and the cement is economical and environment-friendly.)

1. The advanced deep hole grouting reinforcement material for the tunnel in the weak stratum is characterized by being prepared from the following raw materials in parts by weight: 500 portions of cement, 300 portions of waste building sand and 300 portions of sand, 250 portions of fly ash, 50 to 80 portions of calcium chloride, 60 to 90 portions of water glass, 40 to 60 portions of hydroxymethyl cellulose and 600 portions of water.

2. The advance deep hole grouting reinforcement material for the weak stratum tunnel according to claim 1 is characterized by being prepared from the following raw materials in parts by weight: 420 parts of cement 350-containing material, 280 parts of building waste sand stone-containing material, 240 parts of fly ash 160-containing material, 55-70 parts of calcium chloride, 65-85 parts of water glass, 42-56 parts of hydroxymethyl cellulose and 580 parts of water 450-containing material.

3. The advance deep hole grouting reinforcement material for the weak stratum tunnel according to claim 2 is characterized by being prepared from the following raw materials in parts by weight: 400 parts of cement, 260 parts of building waste gravel and sand, 210 parts of fly ash, 65 parts of calcium chloride, 72 parts of water glass, 53 parts of hydroxymethyl cellulose and 520 parts of water.

4. The advance deep hole grouting reinforcement material for the weak stratum tunnel according to claim 3, wherein the particle size of the building waste sand is 3-6 mm.

5. The preparation method of the advance deep hole grouting reinforcement material for the weak stratum tunnel according to any one of claims 1 to 4, characterized by comprising the following steps:

s1, respectively weighing the following raw materials in parts by weight: 500 portions of cement, 300 portions of waste building sand, 300 portions of 200 portions of waste building sand, 250 portions of fly ash, 50 to 80 portions of calcium chloride, 60 to 90 portions of water glass, 40 to 60 portions of hydroxymethyl cellulose and 600 portions of water;

and S2, mixing the raw materials weighed in the S1, and uniformly stirring to obtain the advance deep hole grouting reinforcement material for the tunnel in the weak stratum.

6. The method for preparing the advance deep hole grouting reinforcement material for the weak formation tunnel according to claim 5, wherein the step S2 specifically comprises the following steps:

dissolving S1 hydroxymethyl cellulose in water to obtain a first mixture; dissolving S1 sodium silicate in water to obtain a second mixture; mixing S1 cement, building waste gravel and sand, fly ash and calcium chloride, and adding water to prepare a third mixture; and adding the first mixture into the third mixture, uniformly stirring, adding the second mixture, and uniformly mixing and stirring.

7. The preparation method of the advance deep hole grouting reinforcement material for the weak stratum tunnel according to claim 6, wherein the mass percent of water in the first mixture in S1 water is 5-8%, the mass percent of water in the second mixture in S1 water is 8-12%, and the mass percent of water in the third mixture in S1 water is 80-87%.

8. The method for preparing the advance deep hole grouting reinforcement material for the tunnel in the weak stratum according to claim 5, wherein the fly ash is prepared by sieving with a 60-mesh sieve.

Technical Field

The invention belongs to the technical field of grouting materials, and particularly relates to a weak stratum tunnel advanced deep hole grouting reinforcement material and a preparation method thereof.

Background

During tunnel construction, various complex topographic challenges are often met, particularly, when the tunnel penetrates through a weak stratum, tunnel collapse is easily caused if no pretreatment is carried out due to loose geology and poor soil bonding capability, and tunnel construction safety is seriously threatened. In order to solve the problems, the conventional method adopts a grouting method, namely, before the tunnel is excavated, grouting reinforcement is performed on a weak stratum, and slurry permeates into the stratum and is solidified, so that the originally loose stratum is solidified into a whole, the mechanical property and the permeation resistance of the stratum are improved, and collapse accidents in the tunnel excavation process can be effectively prevented. The current slurry can permeate into a geological layer and improve the mechanical property of weak geology, but has the following problems: when the material is injected into a stratum with more water, the material is easily diluted when meeting water, so that the material proportion is changed, and the material performance is reduced; the raw material price is higher, has improved construction cost.

Disclosure of Invention

The invention aims to provide a reinforcement material for advance deep hole grouting of a tunnel in a weak stratum and a preparation method thereof aiming at the defects in the prior art.

The invention aims to provide a soft stratum tunnel advanced deep hole grouting reinforcement material which is prepared from the following raw materials in parts by weight: 500 portions of cement, 300 portions of waste building sand and 300 portions of sand, 250 portions of fly ash, 50 to 80 portions of calcium chloride, 60 to 90 portions of water glass, 40 to 60 portions of hydroxymethyl cellulose and 600 portions of water.

Preferably, the advance deep hole grouting reinforcement material for the tunnel in the weak stratum is prepared from the following raw materials in parts by weight: 420 parts of cement 350-containing material, 280 parts of building waste sand stone-containing material, 240 parts of fly ash 160-containing material, 55-70 parts of calcium chloride, 65-85 parts of water glass, 42-56 parts of hydroxymethyl cellulose and 580 parts of water 450-containing material.

More preferably, the advance deep hole grouting reinforcement material for the weak stratum tunnel is prepared from the following raw materials in parts by weight: 400 parts of cement, 260 parts of building waste gravel and sand, 210 parts of fly ash, 65 parts of calcium chloride, 72 parts of water glass, 53 parts of hydroxymethyl cellulose and 520 parts of water.

Preferably, the particle size of the building waste sand is 3-6 mm.

The second purpose of the invention is to provide a preparation method of the advanced deep hole grouting reinforcement material for the tunnel of the weak stratum, which comprises the following steps:

s1, respectively weighing the following raw materials in parts by weight: 500 portions of cement, 300 portions of waste building sand, 300 portions of 200 portions of waste building sand, 250 portions of fly ash, 50 to 80 portions of calcium chloride, 60 to 90 portions of water glass, 40 to 60 portions of hydroxymethyl cellulose and 600 portions of water;

and S2, mixing the raw materials weighed in the S1, and uniformly stirring to obtain the advance deep hole grouting reinforcement material for the tunnel in the weak stratum.

Preferably, the S2 specifically includes the following steps:

dissolving S1 hydroxymethyl cellulose in water to obtain a first mixture; dissolving S1 sodium silicate in water to obtain a second mixture; mixing S1 cement, building waste gravel and sand, fly ash and calcium chloride, and adding water to prepare a third mixture; and adding the first mixture into the third mixture, uniformly stirring, adding the second mixture, and uniformly mixing and stirring.

Preferably, the mass percent of water in the first mixture in S1 water is 5-8%, the mass percent of water in the second mixture in S1 water is 8-12%, and the mass percent of water in the third mixture in S1 water is 80-87%.

Preferably, the fly ash is prepared by sieving with a 60-mesh sieve.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, calcium chloride and water glass are added to generate gel, so that the gel property of a material system is improved, and hydroxymethyl cellulose is added to further improve the viscosity of the system, wherein the hydroxymethyl cellulose contains a large amount of hydroxyl groups, and can form an interactive network structure in a slurry system under the electrostatic interaction with calcium ions, so that the material can be rapidly coagulated after being injected, and the invasion of external moisture is prevented, thereby improving the anti-dispersion property of the whole slurry system; the cement is assisted by the building waste sand and stone and the fly ash, so that the use amount of the cement is reduced, waste materials are changed into things of value, and the cement is economical and environment-friendly.

Detailed Description

In order to make the technical solutions of the present invention better understood and enable those skilled in the art to practice the present invention, the following examples and data are provided for further illustration, but the examples are not intended to limit the present invention.