1. The shield muck curing agent is characterized in that: comprises the following components in percentage by mass: cement: calcium oxide: calcium sulfate: sodium polyacrylate ═ 8-15: 4-10: 4-10: 1-4.

2. The resource utilization method of the shield muck curing agent according to claim 1, characterized in that: the method comprises the following steps:

step 1: preparing 100 parts of shield muck and 3-10 parts of curing agent by mass, and uniformly mixing by a machine;

step 2: carrying out initial pressing, leveling and uniform rolling on the uniformly mixed soil body according to the technical specification of highway subgrade construction (JTG F10-2019) specification until the soil body is compact;

and step 3: watering and maintaining for more than 7 days, wherein the shield muck and the curing agent have hydration reaction, polymerization reaction, calcification reaction and volcanic ash reaction;

and 4, step 4: detecting the compactness according to technical Specification for highway subgrade construction (JTG F10-2019);

step 5: the compressive strength and CBR values were determined according to the road soil test code (JTG 3430-2020).

3. The shield muck curing agent according to claim 1, wherein: the components and mass ratio are as follows: cement: calcium oxide: calcium sulfate: sodium polyacrylate ═ 10: 4: 5: 1.

4. the shield muck curing agent according to claim 1, wherein: the components and mass ratio are as follows: cement: calcium oxide: calcium sulfate: sodium polyacrylate ═ 10: 3: 5: 2.

5. the shield muck curing agent according to claim 1, wherein: the components and mass ratio are as follows: cement: calcium oxide: calcium sulfate: sodium polyacrylate ═ 10: 3: 6: 3.

Background

The shield muck refers to soil, soil slag or slurry produced by a tunnel shield in a subway engineering project. At present, a composite earth pressure balance shield is mainly used in a shield construction and tunneling mode of a subway under construction, during the construction of the earth pressure balance shield, muck cut by a cutting system enters an earth bin, and earth pressure formed by the muck is utilized to balance earth pressure and water pressure on a tunnel face, so that the muck can meet the construction requirement only if the muck has certain flowing plasticity.

In order to ensure that an earth pressure balance shield can smoothly tunnel, at present, modifiers such as water, foam, bentonite and the like are mainly injected into excavated muck, so that a soil body has good flow plasticity to meet the requirement of shield tunneling, but the method ensures that the shield muck has high water content, poor permeability, high compressibility and great disposal difficulty.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide the shield muck curing agent, which can effectively improve the mechanical property of the shield muck, reduce the water content of the muck, improve the permeability of the muck and reduce the compressibility of the muck.

The invention also aims to provide a resource utilization method of the shield muck curing agent.

As conceived above, the technical scheme of the invention is as follows: the shield muck curing agent is characterized in that: comprises the following components in percentage by mass: cement: calcium oxide: calcium sulfate: sodium polyacrylate ═ 8-15: 4-10: 4-10: 1-4.

Further, the resource utilization method of the shield muck curing agent comprises the following steps:

step 1: preparing 100 parts of shield muck and 3-10 parts of curing agent by mass, and uniformly mixing by a machine;

step 2: carrying out initial pressing, leveling and uniform rolling on the uniformly mixed soil body according to the technical specification of highway subgrade construction (JTG F10-2019) specification until the soil body is compact;

and step 3: watering and maintaining for more than 7 days, wherein the shield muck and the curing agent have hydration reaction, polymerization reaction, calcification reaction and volcanic ash reaction;

and 4, step 4: detecting the compactness according to technical Specification for highway subgrade construction (JTG F10-2019);

step 5: the compressive strength and CBR values were determined according to the road soil test code (JTG 3430-2020).

Further, the components and mass ratio are as follows: cement: calcium oxide: calcium sulfate: sodium polyacrylate ═ 10: 4: 5: 1.

further, the components and mass ratio are as follows: cement: calcium oxide: calcium sulfate: sodium polyacrylate ═ 10: 3: 5: 2.

further, the components and mass ratio are as follows: cement: calcium oxide: calcium sulfate: sodium polyacrylate ═ 10: 3: 6: 3.

the sodium polyacrylate as the component of the present invention has very strong water absorption, forms colorless transparent viscous gel after absorbing free water, and in alkaline environment, the gel has further strengthened viscosity and adsorbs soil particle, free calcium ion, magnesium ion, etc. after the free water is lost between soil particles, the viscous matter is combined with soil particles to produce large agglomerate and block particle.

The invention utilizes the characteristic of strong water absorption of sodium polyacrylate to rapidly absorb the water in the shield muck, the clay generated by the sodium polyacrylate aggregates soil particles into clusters, the early-strength shield muck curing agent has obvious effect, the shield muck is converted into a plastic state after being treated by the curing agent from a flow plastic state, and the transportation is convenient, thereby solving the problem of shutdown of subway projects due to full load of muck pools, and the mechanical property of the cured soil after being maintained for 7 days meets the requirement of roadbed fillers, thereby realizing the resource utilization of the shield muck.

The invention has the following advantages and positive effects:

1. the water content of the shield muck treated by the shield muck curing agent is 35-90%, the treated shield muck is immediately converted from a flow plastic state to a plastic state, the transportation is convenient, the shield muck is not required to be tedded, and the shield muck is directly filled in layers, compacted in layers and maintained by spraying water, so that the flow is simplified.

2. The shield residual soil solidified soil after solidification and maintenance has good mechanical property, and the soil leaching solution meets the standard and meets the requirement of roadbed filling. Indoor tests and engineering applications show that the water stability is good, the unconfined compressive strength reaches 3-5MPa, and the CBR value is greater than the requirement of first-level highway subgrade filling.

3. The method can effectively reduce the shutdown of shield construction due to shield muck treatment, thereby improving the working efficiency, reducing the disposal cost and realizing the resource utilization of the shield muck.

Detailed Description

The green early strength shield muck curing agent and the resource utilization method are further explained in detail by combining the concrete examples:

the invention provides a shield muck curing agent which comprises the following components in percentage by mass: cement: calcium oxide: calcium sulfate: sodium polyacrylate ═ 8-15: 4-10: 4-10: 1-4.

Example 1: the water content of the shield muck is required to be 53% in the embodiment, and the curing agent comprises the following components in percentage by mass: cement: calcium oxide: calcium sulfate: sodium polyacrylate ═ 10: 4: 5: 1. the mass ratio of the curing agent to the shield muck is 5: 100.

The shield muck source Nanjing subway five-line new pavilion road station.

According to the formula design, the resource utilization method of the shield muck curing agent comprises the following steps:

step 1: curing agent according to mass ratio: adding materials into the shield muck at a ratio of 5:100, and uniformly mixing by a machine; transferring to a roadbed filling construction site;

step 2: carrying out layered filling and compaction on the uniformly mixed soil body according to technical Specification for highway subgrade construction (JTG F10-2019);

and step 3: watering and maintaining for more than 7 days, wherein the shield muck and the curing agent have hydration reaction, polymerization reaction, calcification reaction and volcanic ash reaction;

and 4, step 4: detecting the compactness according to technical Specification for highway subgrade construction (JTG F10-2019), wherein the detection result is 96 percent and meets the specification requirement;

and 5: and (3) detecting the compressive strength and the CBR value according to the Highway soil engineering test regulation (JTG 3430-2020), wherein the detection result shows that the unconfined compressive strength is 4.35MPa, and the CBR value is 36 percent, so that the standard requirement is met.

Example 2:

the water content of the shield muck is required to be 65% in the embodiment, and the curing agent comprises the following components in percentage by mass: cement: calcium oxide: calcium sulfate: sodium polyacrylate ═ 10: 3: 5: 2. the mass ratio of the curing agent to the shield muck is 6: 100.

The shield is from a Nanjing subway five-line Kongyung station.

According to the formula design, the resource utilization method of the shield muck curing agent comprises the following steps:

step 1: curing agent according to mass ratio: adding materials into the shield muck in a ratio of 6:100, and uniformly mixing by a machine; transferring to a roadbed filling construction site;

step 2: carrying out layered filling and compaction on the uniformly mixed soil body according to technical Specification for highway subgrade construction (JTG F10-2019);

and step 3: watering and maintaining for more than 7 days, wherein the shield muck and the curing agent have hydration reaction, polymerization reaction, calcification reaction and volcanic ash reaction;

and 4, step 4: detecting the compactness according to technical Specification for highway subgrade construction (JTG F10-2019), wherein the detection result is 95 percent and meets the specification requirement;

and 5: detecting the compressive strength and the CBR value according to Highway soil engineering test regulation (JTG 3430-2020), wherein the detection result is that the unconfined compressive strength is 3.75MPa, and the CBR value is 28%; and the standard requirement is met.

Example 3:

the water content of the shield muck is required to be 85% in the embodiment, and the curing agent comprises the following components in percentage by mass: cement: calcium oxide: calcium sulfate: sodium polyacrylate ═ 10: 3: 6: 3. the mass ratio of the curing agent to the shield muck is 8: 100.

The shield is from the source of dregs in Nanjing subway on line five Yuan street station.

According to the formula design, the resource utilization method of the shield muck curing agent comprises the following steps:

step 1: curing agent according to mass ratio: adding materials into the shield muck at a ratio of 8:100, and uniformly mixing by a machine; and transferring to a roadbed filling construction site.

Step 2: carrying out layered filling and compaction on the uniformly mixed soil body according to technical Specification for highway subgrade construction (JTG F10-2019);

and step 3: watering and maintaining for more than 7 days, wherein the shield muck and the curing agent have hydration reaction, polymerization reaction, calcification reaction and volcanic ash reaction;

and 4, step 4: detecting the compactness according to technical Specification for highway subgrade construction (JTG F10-2019), wherein the detection result is 95 percent and meets the specification requirement;

and 5: detecting the compressive strength and the CBR value according to the Highway soil engineering test regulation (JTG 3430-2020), wherein the detection result is that the unconfined compressive strength is 3.52MPa, and the CBR value is 22%; and the standard requirement is met.

The embodiments and descriptions described above are illustrative of the principles and embodiments of the present invention, and modifications and variations of this invention are possible without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.