CN101538848A

CN101538848A - Method for treating rock outburst

Info

Publication number: CN101538848A
Application number: CN200910074192A
Authority: CN
Inventors: 王衡
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-04-15
Filing date: 2009-04-15
Publication date: 2009-09-23
Anticipated expiration: 2029-04-15
Also published as: CN101538848B

Abstract

The invention relates to the underground construction technical field, in particular to a method for treating rock outburst which solves the problems that when the existing underground construction is evacuated, low pressure strength, lacking toughness, non-resilience, low rupture strength, and easy happening rock outburst exist in methods such as working surface bolting and shotcreting rigid concrete and the like for preventing rock outburst. The method is as follows: a layer of elastic concrete is bolted and shotcreted on an underground construction excavation working surface; the elastic concrete is made from Portland cement, sand, gravels, concrete complexing agent, bromine, rubber kernels and elastic additive; the spay layer can be firmly bonded on a stone head to form a concrete structure with dense structure, specific elongation, elasticity and toughness, pressive strength reaching up to 60 MPa and the rupture strength increased to four times of the pressive strength; the concrete structure has certain resilience, can reduce the damage of the strong impact force gathered in the rock mass on the terrane, increases the durability of a concrete member, greatly reduces the damage of rock outburst, and solves a difficult problem for the underground construction building which is difficult to be overcome all the time.

Description

A kind of method of administering rock burst

Technical field

The present invention relates to the underground construction technical field, be specially a kind of method of administering rock burst.

Background technology

Rock burst is that a kind of off-load common in the High Ground Stress Areas underground construction destroys the geological disaster phenomenon, be deformation energy fierce suddenly release in Underground Engineering Excavation of building up in the rock mass, the phenomenon that causes the rock explosion and eject, sliver is only peeled off in slight rock burst, do not have and to launch phenomenon, the serious earthquake magnitude that measures 4.6 grades, and with the very big sound, its reason is that surrouding rock stress surpasses its elastic limit, the elastic deformation energy of assembling in the rock mass fierce release suddenly.

At present in the location that rock burst easily takes place, take multiple supporting method such as anchor pole, advance anchor bolt supporting, the supporting of anchor spray concrete, steel fabric shotcrete supporting, steel support effectively to combine the generation that prevents rock burst, specific practice is to spray steel fibre or plastic optical fibre concrete to basement rock arch and sidewall immediately after the explosion, add anchor pole and steel mesh reinforcement again, also will set up the steel bow member in case of necessity and set advance anchor bolt and carry out supporting.The concrete of above-mentioned injection is rigid concrete, promptly its interior capillary porosity is higher after this concrete setting, the particle adhesion stress is relatively poor, like this, formed concrete component frequent moment weight or the effect of impact force under, cause the concrete component ultimate bearing and make component surface be full of cracks, breakage occur.Therefore, have now when Underground Engineering Excavation, on the rock of work plane the layer of concrete compressive strength of anchor spray low, solidify slow, the slump amount is big, the more important thing is that lacking toughness, no springback capacity, rupture strength are low, easier generation rock burst disaster.

Summary of the invention

When the present invention has Underground Engineering Excavation now in order to solve, methods such as employing work plane anchor spray rigidity concrete prevent rock burst, formed layer of concrete exist compressive strength low, solidify slow, the slump amount is big, the more important thing is that lacking toughness, no springback capacity, rupture strength are low, the problem of rock burst very easily takes place, and a kind of method of administering rock burst is provided.

The present invention adopts following technical scheme to realize: a kind of method of administering rock burst, be included in anchor spray one deck elastic concrete on the basement rock of Underground Engineering Excavation work plane, described elastic concrete is to be made by the raw material of following parts by weight: portland cement 400-480kg, sand 635-655kg, stone 1050-1350kg, composite concrete agent 60-72kg, bromine 12-14.4kg, rubber grain 28-33.6kg, elastomeric additive A group powder 20-57.6kg, B group liquids 12-24kg.The consumption of above-mentioned each component can enlarge according to the amount equal proportion of required concrete batching or dwindle.Above-mentioned anchor pressure spray process is existing known technology.

In the above-mentioned prescription, described Portland cement can be the cement of labels such as commercially available P.O425, P.O325, P.O525, preferred No. 525 Portland cements of conch board; Sand can be the river sand of Xuzhou product at least; Granite stones that stone can be shown no increases in output for the Shanxi Province is former at least or limestone rock ballast, particle diameter are 1-5cm; Described composite concrete agent is this application people in the patent No. is disclosed prescription in 200610102246.5 the application documents, be specially silica 48-55%, fluorite 27.5-45%, cetyl benzene sulfonic acid sodium salt 2.5-8%, hydroxycarboxylic acid 4-9%, aliphatic hydroxyl sulphonate high efficiency water reducing agent 0.5-1%, can improve the particle bonding bond stress of elastic concrete aggregate, improve slump, improve concrete compressive strength and rupture strength, make the compressive strength of this elastic concrete reach 60Mpa; Described bromine can be the bromine that Qingdao produces at least, utilizes the flame-retarding characteristic of bromine itself, makes elastic concrete of the present invention become the anti-flaming product of fire prevention, eliminates disaster hidden-trouble; Described rubber grain can increase concrete elasticity and pliability, increases the springback capacity of elastic concrete layer, and this rubber grain can obtain by pulverizing scrap rubber or waste rubber product; Described elastomeric additive is this application people in the patent No. is disclosed prescription in 200510012490.8 the application documents, it comprises A group powder and B group liquids, A group powder prescription is as follows: silica 65-75%, hydroxycarboxylate 2-10%, agstone 10-20%, dispersing agent 0.1-0.8%, water reducing agent 0.05-0.2%, rubber powder 3-6%; B group liquids prescription is as follows: the polyacrylamide of 20-300 gram adds in 100 premium on currency and stirs, make polyacrylamide solution, the polyethers of 10-200 gram adds in 100 premium on currency and stirs, make polyethers solution, polyethers solution and polyacrylamide solution are with 1: 2-4 mixes and stirring obtains B group liquids, this additive joins in the concrete of the present invention, disclosed consistent in its mechanism of action and the above-mentioned patent document, other component in this elastomeric additive and the concrete formulation of the present invention cooperatively interacts, make concrete rupture strength bring up to four times of compressive strength, further improved concrete durability.

The thickness of described elastic concrete layer is 10-15cm, in this thickness range, can satisfy the elastic limit of common surrouding rock stress; The particle diameter of described rubber grain is 1-3mm; The soil that contains in the described sand is measured less than 3%, otherwise can influence concrete particle adhesion stress.

Compared with prior art, the present invention's elastic concrete that anchor spray one deck is filled a prescription as described herein on the basement rock of deep layer excavated surface, firm being bonded on the basement rock of this spray-up energy, the formation structure is closely knit, has elongation per unit length, elasticity and toughness, and compressive strength can reach 60Mpa, rupture strength is brought up to the concrete structure of four times of compressive strength, when rock burst takes place in its inside, this elastic concrete layer has certain springback capacity, can reduce the destruction of the strong impact force of gathering in the rock mass to the rock stratum, improve the durability of concrete component, if be used, will greatly reduce the harm of rock burst, even can avoid the generation of rock burst with original multiple supporting method, for underground engineering construction has solved a great difficult problem that is difficult to overcome always, has good application prospects.

The specific embodiment

Embodiment 1:

A kind of method of administering rock burst, be included in anchor spray one deck elastic concrete on the basement rock of Underground Engineering Excavation work plane, the thickness of elastic concrete layer is 10cm, described elastic concrete is to be made by the raw material of following parts by weight: portland cement 400kg, sand 635kg, the soil amount of containing in the sand is 2%, stone 1050kg, composite concrete agent 60kg, bromine 12kg, rubber grain 28kg, particle diameter are 1mm, elastomeric additive A group powder 20kg, B group liquids 12kg, each raw material of this elastic concrete is fully mixed, stir then, utilize existing anchor spraying equipment to be sprayed onto on the basement rock, get final product until desired thickness.

Embodiment 2:

A kind of method of administering rock burst, be included in anchor spray one deck elastic concrete on the basement rock of Underground Engineering Excavation work plane, the thickness of elastic concrete layer is 15cm, described elastic concrete is to be made by the raw material of following parts by weight: portland cement 480kg, sand 655kg, the soil that contains in the sand is measured less than 3% stone 1350kg, composite concrete agent 72kg, bromine 14.4kg, rubber grain 33.6kg, particle diameter are 3mm, elastomeric additive A group powder 57.6kg, B group liquids 24kg, each raw material of this elastic concrete is fully mixed, stir then, utilize existing anchor spraying equipment to be sprayed onto on the basement rock, get final product until desired thickness.

Embodiment 3:

A kind of method of administering rock burst, be included in anchor spray one deck elastic concrete on the basement rock of Underground Engineering Excavation work plane, the thickness of elastic concrete layer is 12cm, described elastic concrete is to be made by the raw material of following parts by weight: portland cement 450kg, sand 655kg, the soil amount of containing in the sand is 1%, stone 1050kg, composite concrete agent 72kg, bromine 13kg, rubber grain 28kg, particle diameter are 1mm, elastomeric additive A group powder 57.6kg, B group liquids 12kg, each raw material of this elastic concrete is fully mixed, stir then, utilize existing anchor spraying equipment to be sprayed onto on the basement rock, get final product until desired thickness.

Embodiment 4:

A kind of method of administering rock burst, be included in anchor spray one deck elastic concrete on the basement rock of Underground Engineering Excavation work plane, the thickness of elastic concrete layer is 14cm, described elastic concrete is to be made by the raw material of following parts by weight: portland cement 475kg, sand 640kg, the soil that contains in the sand is measured less than 3% stone 1200kg, composite concrete agent 65kg, bromine 13.5kg, rubber grain 31kg, particle diameter are 2mm, elastomeric additive A group powder 35kg, B group liquids 18kg, each raw material of this elastic concrete is fully mixed, stir then, utilize existing anchor spraying equipment to be sprayed onto on the basement rock, get final product until desired thickness.

Claims

1, a kind of method of administering rock burst is characterized in that being included in anchor spray one deck elastic concrete on the basement rock of Underground Engineering Excavation work plane, and described elastic concrete is to be made by the raw material of following parts by weight:

Portland cement 400-480kg, sand 635-655kg, stone 1050-1350kg, composite concrete agent 60-72kg, bromine 12-14.4kg, rubber grain 28-33.6kg, elastomeric additive A group powder 20-57.6kg, B group liquids 12-24kg.

2, a kind of method of administering rock burst according to claim 1, the thickness that it is characterized in that the elastic concrete layer is 10-15cm.

3, a kind of method of administering rock burst according to claim 1 and 2, the particle diameter that it is characterized in that described rubber grain is 1-3mm.

4, a kind of method of administering rock burst according to claim 1 and 2 is characterized in that the soil that contains in the described sand is measured less than 3%.