CN103573276A - Dynamic grouting construction method for water-rich silty-fine sand stratum - Google Patents
Dynamic grouting construction method for water-rich silty-fine sand stratum Download PDFInfo
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- CN103573276A CN103573276A CN201310576180.3A CN201310576180A CN103573276A CN 103573276 A CN103573276 A CN 103573276A CN 201310576180 A CN201310576180 A CN 201310576180A CN 103573276 A CN103573276 A CN 103573276A
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Abstract
The invention discloses a dynamic grouting construction method for a water-rich silty-fine sand stratum. The method comprises the steps that a whole grouting range is divided into a water stopping area, a water stopping reinforcing area and a reinforcing area from outside to inside in sequence according to the situations of the stratum and underground water; construction preparation is carried out by detecting stratum parameters; water stopping grout is allocated according to the stratum parameters to carry out grouting and water stopping on the water stopping area; water stopping and stratum reinforcing grout is allocated according to the stratum parameters to carry out grouting, water stopping and stratum reinforcing on the water stopping reinforcing area; stratum reinforcing grout is allocated according to the stratum parameters to carry out grouting and stratum reinforcing on the stratum reinforcing area; a water pressure test is carried out on an area with tunnels to be excavated, osmotic coefficients are detected, detection is carried out on the intensity of a soil body, and a grouting effect is detected; tunnel excavation is carried out when the detection result shows that the grouting effect is good, and grouting weak links are checked and complementary grouting is specifically carried out on the grouting weak links when the detection result shows that the grouting effect is poor. Through the dynamic grouting construction method for the water-rich silty-fine sand stratum, good grouting, water stopping and reinforcing effects can be achieved on the water-rich silty-fine sand stratum.
Description
Technical field
The present invention relates to tunnel and underground construction technical field, particularly relate to a kind of mobilism grouting construction method of rich pigment fine sand layer.
Background technology
Fast development along with underground space development, increasing engineering can run into rich pigment fine sand layer, this stratum abundant water, there is certain pressure-bearing property, gush the blowout water yield large, may cause gushing water, cave in, the accident such as inbreak, thereby have influence on the safety of ground, surrounding enviroment, have a strong impact on programming and construction quality, even cause engineering to carry out and personnel casualty accidents, cause huge economic loss.Therefore, when running into rich pigment fine sand layer, often need to carry out grouting for water blocking reinforcing, just can carry out successive projects.
Traditional grouting method thinks that fine sand layer is uniformly, and in tunnel excavation process, is all constant, and this theory causes certain blindness, makes the slip casting failure of rich pigment fine sand more than success.Conventionally the grouting method adopting is at present Full-face pouring technology, and its supposition stratum is equally distributed, and outer side hydraulic pressure is uniformly distributed, and grouting and reinforcing scope is relevant with outer side hydraulic pressure, and hydraulic pressure is higher, the water yield is larger, and reinforcing scope is also just larger.But in fact stratum is uneven distribution, outer side hydraulic pressure neither be equally distributed, and along with the excavation in tunnel, formation condition and underground water are dynamic changes, thus Full-face pouring technology easily cause slip casting failure or slip casting effect undesirable.
Summary of the invention
The deficiency existing for overcoming above-mentioned prior art, the present invention's main purpose is to provide a kind of rich pigment fine sand stratum mobilism grouting construction method, to realize the mobilism of slip casting, in the slip casting of rich pigment fine sand layer, reaches good ejection for water plugging consolidation effect.
For reaching above-mentioned and other object, the present invention proposes a kind of rich pigment fine sand stratum mobilism grouting construction method, comprises the steps:
Step 1, is divided into sealing district, water sealing consolidation district and stabilization zone according to stratum and groundwater condition from outside to inside successively by whole range of grouting;
Step 2, detects formation parameter and carries out preparation of construction;
Step 3, according to detecting the formation parameter configuration water-stop slurry obtaining, utilizes described water-stop slurry to carry out ejection for water plugging to described sealing district, does not require generation intensity;
Step 4, according to the formation parameter configuration sealing detect the obtaining strengthening stratum slurries of holding concurrently, utilizes the described sealing strengthening stratum slurries of holding concurrently to carry out ejection for water plugging strengthening stratum to described water sealing consolidation district;
Step 5, according to detecting the formation parameter configuration strengthening stratum slurries that obtain, utilizes described strengthening stratum slurries to carry out Grouting Consolidation to described stabilization zone;
Step 6, treats that to tunnel excavation area carries out the hydrostatic test, check transmission coefficient, and soil strength is tested, check slip casting effect;
Step 7, is slip casting effect when good in check result, carries out tunnel excavation; In check result, be slip casting effect when bad, find slip casting weak link, slip casting weak link specific aim is supplemented to slip casting.
Further, after step 7, also comprise the steps:
The water yield, current, soil body stream plasticity according to excavating out the soil body, further judge that whether slip casting effect is good;
If judgment result is that, slip casting effect is good, further judges whether slip casting process needs to optimize, if judgment result is that when slip casting effect is not good, finds slip casting weak link, and slip casting weak link specific aim is supplemented to slip casting;
As slip casting process needs to optimize, according to the water yield of the soil body excavating out, current, soil body stream plastic analysis front of tunnel heading stratum, groundwater change situation, according to analysis result, the slip casting process of next circulation is optimized, otherwise directly enters next circulation slip casting process.
It is further, described that slip casting weak link specific aim is supplemented to the step of slip casting is as follows:
If slip casting weak link when to be stagnant water effect bad, is returned to step 3; If slip casting weak link when to be sealing consolidation effect bad, is returned to step 4; When if the consolidation effect that slip casting weak link is described stabilization zone is bad, returns to step 5 and carry out region reinforcement.
Further, described sealing district is outermost region, tunnel, and described water sealing consolidation district is in described sealing district, outside described tunnel, have certain sealing ability and have the region of certain reinforcement effect, and described stabilization zone is for the region of fixed loose soil layer in tunnel.
Further, described sealing district is the region for 0.8～1.2m outside tunnel excavation outline line, described water sealing consolidation district can be the region of 0.8～1.2m within 1.5～2.5m outside excavation contour line, excavation contour line, and described stabilization zone is the nucleus within excavation contour line.
Further, described formation parameter comprises transmission coefficient, the water yield on stratum, the composition situation of particle.
Further, described water-stop slurry adopts modified water glass slurry, and the described sealing strengthening stratum slurries of holding concurrently adopt ordinary Portland cement-water glass slurry, and described strengthening stratum slurries adopt cement paste.
Further, in step 6, adopt inspection eye to get core method and inspection eye transmission coefficient method of testing combinatorial test slip casting effect.
Compared with prior art, a kind of rich pigment fine sand of the present invention stratum mobilism grouting construction method is by slip casting and tunnel excavation observation combination, by observed result analysis, judge slip casting effect, find slip casting weak link, and guide and whether take to supplement slip casting, and by observed result analysis judgement front of tunnel heading stratum, groundwater change situation, instruct next circulation slip casting reasonable implementation, thereby realized the mobilism of slip casting, avoided the blindness of slip casting, slurry injection technique is tallied with the actual situation more, thereby reach good ejection for water plugging consolidation effect.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of a kind of rich pigment fine sand of the present invention stratum mobilism grouting construction method;
Fig. 2 is subregion schematic diagram in preferred embodiment of the present invention;
Fig. 3 is the flow chart of steps of the preferred embodiment of a kind of rich pigment fine sand of the present invention stratum mobilism grouting construction method;
Fig. 4 is full section water-stop curtain mortar depositing construction schematic diagram in the hole of preferred embodiment of the present invention.
The specific embodiment
Below, by specific instantiation accompanying drawings embodiments of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by content disclosed in the present specification.The present invention also can be implemented or be applied by other different instantiation, and the every details in this manual also can be based on different viewpoints and application, carries out various modifications and change not deviating under spirit of the present invention.
Fig. 1 is the flow chart of steps of a kind of rich pigment fine sand of the present invention stratum mobilism grouting construction method.As shown in Figure 1, a kind of rich pigment fine sand of the present invention stratum mobilism grouting construction method, the slip casting for rich pigment fine sand stratum, comprises the steps:
Step 101, is divided into three regions according to stratum and groundwater condition by whole range of grouting, that is: sealing district, water sealing consolidation district and stabilization zone, as shown in Figure 2:
(1) sealing district is outermost slip casting, and Main Function is sealing, according to groundwater condition, can perform individual layer sealing district or multilayer sealing district;
(2) water sealing consolidation district, plays and has certain sealing ability and have certain reinforcement effect, can this be divided into and take sealing as main or take that to reinforce be that main ，Gai district, region is distributed in sealing district according to groundwater condition;
(3) stabilization zone is simple reinforcing, and Main Function is fixed loose soil layer, is beneficial to tunnel or excavation of foundation pit.
Preferably, for obtaining better ejection for water plugging consolidation effect, after step 107, also comprise the steps:
Fig. 3 is the flow chart of steps of the preferred embodiment of a kind of rich pigment fine sand of the present invention stratum mobilism grouting construction method.In preferred embodiment of the present invention, before mobilism slip casting, carry out preparation of construction: first according to stratum and groundwater condition, whole range of grouting is divided into sealing district, water sealing consolidation district and San Ge region, stabilization zone, sealing district is the outermost slip casting district outside tunnel, can be 0.8～1.2m outside tunnel excavation outline line, water sealing consolidation district can be 1.5～2.5m outside excavation contour line, 0.8～1.2m within excavation contour line, stabilization zone is the nucleus within excavation contour line, Fig. 4 is full section water-stop curtain mortar depositing construction schematic diagram in the hole of preferred embodiment of the present invention.In figure, black outline line is interval main track preliminary bracing structure, and in structure, innermost region is soil stabilization district, 1m in structure, and the region of the outer 2m of structure is sealing stabilization zone, pool till the region of outermost, width is 1m; Then detect transmission coefficient, the water yield on stratum, the parameters such as composition situation of particle are carried out preparation of construction, in preferred embodiment of the present invention, soil sample is carried out to sieve test, the soil body apparent density be 2600kg/m3, fineness modulus is 1.3, belongs to powder fine sand.
After preparation of construction, carry out slip casting process, first configure water-stop slurry, utilize water-stop slurry to carry out ejection for water plugging to sealing district, do not require generation intensity, the configuration sealing strengthening stratum slurries of holding concurrently, water sealing consolidation district is carried out to ejection for water plugging strengthening stratum, and configuration strengthening stratum slurries, carry out Grouting Consolidation to stabilization zone.Be proven ， sealing district and adopt modified water glass Jiang， water sealing consolidation district to adopt ordinary Portland cement (superfine cement)-water glass slurry, stabilization zone adopts cement paste.
Then tunnel is treated to excavation area carries out the hydrostatic test, check transmission coefficient, and soil strength is tested, check slip casting effect, by slip casting effect inspection, determine and supplement slip casting or excavate.
In the present invention, the method for slip casting effect inspection can be divided into four large classes, is respectively: 1) analysis classes: P-Q-t curve method, water yield method of comparison, slurries filling rate anti-inference method; 2) check class: inspection eye observation, inspection eye are got core method (commonly using), inspection eye transmission coefficient method of testing (commonly using); 3) process class: digging process consolidation effect observation, monitoring test data criterion; 4) physical prospecting class: radar method, electrical method.In preferred embodiment of the present invention, adopt inspection eye to get core method and inspection eye transmission coefficient method of testing (water flood) combinatorial test.In check result be slip casting effect good after, carry out tunnel excavation; In check result, be slip casting effect when bad, find slip casting weak link, specific aim is supplemented slip casting.For example, when slip casting weak link is that stagnant water effect is bad, return to ejection for water plugging, slip casting weak link is sealing consolidation effect when bad, returns to ejection for water plugging and reinforces, slip casting weak link is that the consolidation effect in tunnel reinforcement district is bad, returns to grouting and reinforcing and carries out region reinforcement.
After tunnel excavation, the water yield, current, soil body stream plasticity according to excavating out the soil body, further judge that whether slip casting effect is good.
If judgment result is that, slip casting effect is good, further judge whether slip casting process needs to optimize, as needed, optimize, according to the water yield of the soil body excavating out, current, soil body stream plastic analysis front of tunnel heading stratum, groundwater change situation, according to analysis result, the slip casting process of next circulation is optimized, to instruct next circulation slip casting reasonable implementation, if do not needed to optimize, directly enter next circulation slip casting process; If judgment result is that, slip casting effect is not good, finds slip casting weak link, and specific aim is supplemented slip casting.For example, when slip casting weak link is that stagnant water effect is bad, return to ejection for water plugging, slip casting weak link is sealing consolidation effect when bad, returns to step ejection for water plugging and reinforces, slip casting weak link is that the consolidation effect in tunnel reinforcement district is bad, returns to grouting and reinforcing and carries out region reinforcement
In sum, a kind of rich pigment fine sand of the present invention stratum mobilism grouting construction method is by slip casting and tunnel excavation observation combination, by observed result analysis, judge slip casting effect, find slip casting weak link, and guide and whether take to supplement slip casting, and by observed result analysis judgement front of tunnel heading stratum, groundwater change situation, instruct next circulation slip casting reasonable implementation, thereby realized the mobilism of slip casting, avoided the blindness of slip casting, slurry injection technique is tallied with the actual situation more, thereby reach good ejection for water plugging consolidation effect.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any those skilled in the art all can, under spirit of the present invention and category, modify and change above-described embodiment.Therefore, the scope of the present invention, should be as listed in claims.
Claims (8)
1. a rich pigment fine sand stratum mobilism grouting construction method, comprising:
Step 1, is divided into sealing district, water sealing consolidation district and stabilization zone according to stratum and groundwater condition from outside to inside successively by whole range of grouting;
Step 2, detects formation parameter and carries out preparation of construction;
Step 3, according to detecting the formation parameter configuration water-stop slurry obtaining, utilizes described water-stop slurry to carry out ejection for water plugging to described sealing district, does not require generation intensity;
Step 4, according to the formation parameter configuration sealing detect the obtaining strengthening stratum slurries of holding concurrently, utilizes the described sealing strengthening stratum slurries of holding concurrently to carry out ejection for water plugging strengthening stratum to described water sealing consolidation district;
Step 5, according to detecting the formation parameter configuration strengthening stratum slurries that obtain, utilizes described strengthening stratum slurries to carry out Grouting Consolidation to described stabilization zone;
Step 6, treats that to tunnel excavation area carries out the hydrostatic test, check transmission coefficient, and soil strength is tested, check slip casting effect;
Step 7, is slip casting effect when good in check result, carries out tunnel excavation; In check result, be slip casting effect when bad, find slip casting weak link, slip casting weak link specific aim is supplemented to slip casting.
2. a kind of rich pigment fine sand as claimed in claim 1 stratum mobilism grouting construction method, is characterized in that: after step 7, also comprise the steps:
The water yield, current, soil body stream plasticity according to excavating out the soil body, further judge that whether slip casting effect is good;
If judgment result is that, slip casting effect is good, further judges whether slip casting process needs to optimize, if judgment result is that when slip casting effect is not good, finds slip casting weak link, and slip casting weak link specific aim is supplemented to slip casting;
As slip casting process needs to optimize, according to the water yield of the soil body excavating out, current, soil body stream plastic analysis front of tunnel heading stratum, groundwater change situation, according to analysis result, the slip casting process of next circulation is optimized, otherwise directly enters next circulation slip casting process.
3. a kind of rich pigment fine sand as claimed in claim 2 stratum mobilism grouting construction method, is characterized in that, described that slip casting weak link specific aim is supplemented to the step of slip casting is as follows:
If slip casting weak link when to be stagnant water effect bad, is returned to step 3; If slip casting weak link when to be sealing consolidation effect bad, is returned to step 4; When if the consolidation effect that slip casting weak link is described stabilization zone is bad, returns to step 5 and carry out region reinforcement.
4. a kind of rich pigment fine sand as claimed in claim 1 stratum mobilism grouting construction method, it is characterized in that: described sealing district is outermost region, tunnel, described water sealing consolidation district is in described sealing district, outside described tunnel, have certain sealing ability and have the region of certain reinforcement effect, and described stabilization zone is for the region of fixed loose soil layer in tunnel.
5. a kind of rich pigment fine sand as claimed in claim 4 stratum mobilism grouting construction method, it is characterized in that: described sealing district is the region for 0.8～1.2m outside tunnel excavation outline line, described water sealing consolidation district can be the region of 0.8～1.2m within 1.5～2.5m outside excavation contour line, excavation contour line, and described stabilization zone is the nucleus within excavation contour line.
6. a kind of rich pigment fine sand as claimed in claim 1 stratum mobilism grouting construction method, is characterized in that: described formation parameter comprises transmission coefficient, the water yield on stratum, the composition situation of particle.
7. a kind of rich pigment fine sand as claimed in claim 1 stratum mobilism grouting construction method, it is characterized in that: described water-stop slurry adopts modified water glass slurry, the described sealing strengthening stratum slurries of holding concurrently adopt ordinary Portland cement-water glass slurry, and described strengthening stratum slurries adopt cement paste.
8. a kind of rich pigment fine sand as claimed in claim 1 stratum mobilism grouting construction method, is characterized in that: in step 6, adopt inspection eye to get core method and inspection eye transmission coefficient method of testing combinatorial test slip casting effect.
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| CN104747208A (en) * | 2015-01-27 | 2015-07-01 | 山东科技大学 | Grouting reinforcement grout diffusion regulation method |
| CN106149677A (en) * | 2015-04-16 | 2016-11-23 | 中铁二院工程集团有限责任公司 | High-pressure water-enriched goaf grouting reinforcement means |
| CN108590698A (en) * | 2018-04-27 | 2018-09-28 | 中铁十二局集团有限公司 | Jacked piles with small section abnormal deformation treatment effect control method |
| CN108842754A (en) * | 2018-07-05 | 2018-11-20 | 浙江科技学院 | Rich in the grouting strengthening method and device in flowing underground water gravel boulder bed |
| CN109681214A (en) * | 2019-03-01 | 2019-04-26 | 中国水利水电第八工程局有限公司 | A kind of construction method of Full-face pouring strengthening stratum |
| CN110499757A (en) * | 2019-08-27 | 2019-11-26 | 中铁二局集团有限公司 | A kind of water-rich sand layer three axes agitating pile construction method |
| CN111175477A (en) * | 2020-03-10 | 2020-05-19 | 北京市政路桥股份有限公司 | Saturated fine sand layer induced grouting experimental model and experimental method |
| CN111691903A (en) * | 2020-06-02 | 2020-09-22 | 中铁十五局集团第三工程有限公司 | Construction method of pipe-curtain-method supporting structure |
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