CN109610502B - Construction method of concealed modified soil anti-slip retaining wall - Google Patents
Construction method of concealed modified soil anti-slip retaining wall Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0275—Retaining or protecting walls characterised by constructional features cast in situ
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Abstract
A construction method of a concealed modified soil anti-skid retaining wall is characterized in that a construction method combining a segmented excavation mode (L1) with a partitioned layered (h1, h2) excavation mode, combining a main excavation mode (7) with an auxiliary excavation mode (6), combining on-site stirring compaction rapid construction with timely temporary support is adopted for construction, compared with the similar methods, the construction method has the advantages of high construction speed, stable groove wall, easy control of construction quality, low construction cost and the like, and is particularly suitable for treating deep landslides in high liquid limit residual soil above soil-rock interfaces of argillaceous sandstone and carbonaceous shale residual soil cutting side slopes.
Description
Technical Field
The invention relates to a concealed modified soil anti-slip retaining wall, in particular to a construction method of the concealed modified soil anti-slip retaining wall.
Background
In recent years, highway and hydraulic engineering scientists have begun to research and apply soil improvement technology to treatment of swelling soil embankment side slopes, and achieved unusual engineering benefits and technical achievements. However, due to the lack of a proper construction technical method, the soil improvement technology cannot be directly applied to the treatment of landslides of the soil slope of the middle-deep expansive soil at present, and the scheme of a composite structure of anchor cables and anti-slide piles with poor economical efficiency is still mainly adopted for treating the landslides at home and abroad, so that a treatment method with reliable technology and better economical efficiency is urgently needed in engineering practice.
The expansive soil side slope landslide is mainly shallow layer landslide, but the thick layer residual soil landslide at the upper part of the argillaceous sandstone and carbonaceous shale cutting side slope is usually middle and deep layer landslide. The residual soil of the argillaceous sandstone and the carbonaceous shale is high liquid limit soil with weak expansibility, so the landslide belongs to a landslide of medium and deep layers of expansive soil. The main inducement of the landslide damage is that the unloading crack formed by the unloading action of the excavation on the excavation surface of the slope and the shrinkage crack formed by the shrinkage of the high liquid limit soil body under the dry and dehydrated condition open a convenient door for rainwater infiltration, and the rainwater infiltrates into the soil-rock interface to greatly increase the water content of the high liquid limit soil body above the soil-rock interface, so that the soil body is humidified and expanded, the strong shear strength is rapidly reduced until the strength is close to that of soft soil, and finally, the low strength induces the high liquid limit residual soil to generate middle-deep layer landslide damage along the soil-rock interface. This kind of landslide often length is great, if adopt retaining wall to manage, often needs multistage retaining wall, and this just must be built the concealed retaining wall in the middle part of the landslide body.
At present, cement modified soil is commonly used for chemically improving high liquid limit soil filler, the cement modified soil after the cement chemical improvement not only eliminates the bad deformation characteristic of dry shrinkage and wet swelling of the high liquid limit soil, but also has the good characteristic of fast hardening and forming the shear strength far higher than that of a humidified original high liquid limit soil body with higher cement mixing amount. If a proper construction method for applying the cement modified soil technology to the construction of the concealed retaining wall can be found, the multistage cement modified soil gravity type retaining wall can be formed by means of the larger dead weight of the large-width cement modified soil retaining wall, and the treatment of deep landslides in the high liquid limit soil can be realized.
Disclosure of Invention
The main problem that the modified soil is difficult to be used for treating the landslide of the expanded soil in the middle and deep layers is that when the excavation construction of the concealed type modified soil anti-skid retaining wall is carried out on the argillaceous sandstone and carbonaceous shale residual soil cutting slope of the damaged landslide, the secondary sliding of the slope is difficult to be ensured, and the stability of the wall of the excavated groove is difficult to be kept.
The middle and deep landslides of argillaceous sandstone and carbonaceous shale residual soil cutting slope are usually along the traction type, the progressive landslide that take place along the soil-rock interface, and the landslide body often comprises large-scale whole slider and crack area, and the glide plane is comparatively mild, and mostly is wriggling landslide, therefore, when large-scale whole slider body carries out the minor segment face excavation, the landslide body still has short-term interim soil arch effect and provides the stability of hole wall short-term. The technical idea of the invention is that based on the temporary soil arch effect of the large-sized sliding block body in the landslide, a reasonable excavation method is adopted, the technology of probing groove type small-section rapid excavation and rapid backfilling modified soil is utilized, and the early strength agent is added into the modified soil in a matching manner, so that the backfilled modified soil can provide a supporting effect in time before the probing groove type small-section temporary soil arch effect fails, and the stable excavation construction of a concealed retaining wall is realized. Specifically, the invention mainly realizes the stable and low-cost construction of the concealed anti-sliding retaining wall by the following measures:
1) the invention adopts 10 percent of cement, 3 percent of water glass and 87 percent of excavation landslide high liquid limit soil material to mix modified soil, then adds proper amount of water into the mixed modified soil material, uses an excavator to mix on site, backfills and compacts the mixture into an excavation groove, so as to form the cement modified soil wall body with rapid hardening characteristic. Because the main material of the wall body is excavated high liquid limit soil residual soil landslide soil material, the cost of the soil material is very low, and in addition, the construction cost of mixing, backfilling and compacting is greatly reduced by mixing, backfilling and compacting on site by using an excavator, so that the construction method provided by the invention has the advantages of rapidness and economy compared with the similar method;
2) the invention adopts a sectional, divisional and layered excavation mode, thereby realizing the aim of keeping the cell wall temporarily stable during excavation by means of the temporary soil arch effect provided by small-section excavation. On one hand, the design length (L) of the modified soil anti-skid retaining wall is divided into a plurality of construction sections by the width (L1) of 5m on a plane (1-a), each construction section comprises a main excavation area (7) and an auxiliary excavation area (6), the length of the main excavation area (7) is kept consistent with the design width (b) of the modified soil anti-skid retaining wall, and after construction of one construction section is completed, construction of at least one construction section is required to be separated and then the next construction section is carried out, so that the stability of a landslide slope body during the whole construction period is ensured; on the other hand, the half depth of the design depth (h) of the modified soil anti-skid retaining wall is used as the single-layer excavation depth on the section (1-b), and the construction section is divided into an upper layer area and a lower layer area according to the upper layer (h1) and the lower layer (h2) so as to facilitate the excavation operation of the excavator. The sample invention realizes that the section of single excavation is controlled in a small section range of 5m multiplied by 5m by combining the sectional excavation with the partitioned excavation and the layered excavation, and can provide temporary soil arch effect by virtue of the small section to ensure the transient stability of the groove wall during the excavation;
3) the invention adopts the combination of a main excavation mode and an auxiliary excavation mode to realize the purposes of rapid supporting and deep rapid excavation and ensure the stability of the pit wall during the whole excavation period. The design range of the concealed type modified soil anti-skid retaining wall is used as a main excavation region (7), the main excavation region (7) comprises two layers of a main excavation upper layer region (1) and a main excavation lower layer region (5), an auxiliary excavation region (6) is arranged in the ascending direction and the descending direction of the main excavation upper layer region (1), and the auxiliary excavation region (6) comprises three parts, namely an auxiliary excavation upper layer region (2) in the ascending direction, an auxiliary excavation upper layer region (3) below the descending direction side and an auxiliary excavation upper layer region (4) right below the descending direction. During excavation, firstly excavating the auxiliary excavation upper layer area (2), and by means of measures such as material mixing in advance, rapid compaction and backfilling of cement modified soil and the like, and by utilizing the rapid hardening characteristic of the cement modified soil, the aims of forming a temporary supporting structure for the main excavation upper layer area (1) in the range of the auxiliary excavation upper layer area (2) before the failure of the temporary soil arch effect of the landslide soil body and ensuring the stability of the excavation groove wall of the main excavation upper layer area (1) are achieved; the method is characterized in that an upper and lower operation channel is provided for the excavator to perform main excavation of a lower layer area (5) by excavating an auxiliary excavation upper layer area (3) in a downhill direction, and an operation machine position is provided for the excavator to perform main excavation of the lower layer area (5) by excavating an auxiliary excavation upper layer area (4) in the downhill direction.
In a word, the construction method of the concealed modified soil anti-slip retaining wall provided by the invention can be used for treating the middle and deep layer landslide of the argillaceous sandstone and carbonaceous shale residual soil cutting slope along the soil-rock interface, and compared with the similar construction method, the construction method has the advantages of high construction speed, stable pit wall support, easy control of construction quality, low construction cost and the like.
Drawings
Fig. 1 is a schematic view illustrating a construction method of a concealed type modified soil anti-slip retaining wall, and in fig. 1, (1-a) is a partition plan view of a construction section of a wall, (1-B) is a plan view of a single construction section, (1-c) is a sectional view a-a 'of a single construction section, and (1-d) is a sectional view B-B' of a single construction section.
Detailed Description
The wall body of the concealed type modified soil anti-skid retaining wall provided by the invention consists of modified soil; the solid weight mixing ratio of the modified soil is 10% of cement, 3% of water glass and 87% of high liquid limit soil material for landslide excavation; the invention divides a hidden type modified soil anti-skid retaining wall into a plurality of construction sections (1-a) according to the excavation construction procedure; the single construction section (1-b) comprises a main excavation area (7) and an auxiliary excavation area (6) (1-a); the main excavation region (7) comprises a main excavation upper layer region (1) positioned on the upper layer (h1) and a main excavation lower layer region (5) positioned on the lower layer (h2), and is distributed in the design range (1-c) of the anti-skid retaining wall of the modified soil; the auxiliary excavation region (6) comprises an auxiliary excavation upper layer region (2) positioned at the ascending position of the upper layer (h1), an auxiliary excavation upper layer region (3) below the descending position side and an auxiliary excavation upper layer region (4) right below the descending position, and is a construction range (1-b) (1-c) (1-d) increased for auxiliary construction. The invention will be further explained with reference to fig. 1 and a specific construction example in slope landslide reinforcement of a slope excavated from a certain expansive soil in Baise, Guangxi.
1. The wall body of the concealed type modified soil anti-skid retaining wall provided by the invention consists of modified soil; the solid weight mixing ratio of the modified soil is 10% of cement, 3% of water glass and 87% of high liquid limit soil material for landslide excavation; the construction method of the concealed modified soil anti-slip retaining wall is characterized by comprising the following steps:
1) selecting a construction section, digging an auxiliary excavation upper layer area (2) of an upper slope position of a main excavation upper layer area (1) by using a plane size (1-a) with the length (L1) of 5m and the width (b1) of 3m and the depth size of 5m, sprinkling excavated high liquid limit soil materials to a soft and plastic state, mixing and proportioning the solid weight of 10% of cement, 3% of water glass and 87% of high liquid limit soil, and uniformly mixing the materials on site by using an excavator, wherein the mixed cement modified soil materials are in a hard and plastic state (1-a);
2) and backfilling the mixed modified soil materials layer by layer to assist in excavating the upper layer area (2) to the ground surface, wherein the thickness of the single-layer virtual pavement is 70cm, the width (b1) is 3m, compacting is carried out by adopting an excavator bucket, the number of compaction passes is not less than 6 times, and the thickness is ensured to be not more than 50 cm. After the layered backfilling and compaction are finished for 1 day, the modified soil body can be hardened, so that a temporary supporting structure (1-a,1-d) for the main excavation upper layer area (1) is formed;
3) excavating a main excavation upper layer area (1) according to excavation sizes of length (b), width (L1) and depth (h 2);
4) excavating an auxiliary excavation upper layer region (3) by using a plane size (1-a) with the length (L1) of 5m and the width (b1) of 3m and a depth size with the starting depth of the left end of 0m and the ending depth of the right end of 5m, and excavating an auxiliary excavation upper layer region (4) (1-d) by using a plane size (1-a) with the length (L1) of 5m and the width (b1) of 3m and a depth size with the depth of 5 m;
5) the excavator is driven to the bottom of the auxiliary excavation upper layer region (4) from the excavated auxiliary excavation upper layer region (3);
6) excavating a main excavation lower storey (5) with a length (b), a width (L1) and a depth (h1)
Carrying out layered backfilling by using the mixed modified soil material, wherein the requirements of single-layer virtual paving and compaction are the same as those of the step 2);
7) referring to the step 5), backfilling the main excavation upper layer area (1);
8) referring to the step 5), backfilling the auxiliary excavation upper layer area (3) and the auxiliary excavation upper layer area (4) to complete all construction of the first construction section;
9) selecting the next construction section according to the principle of separating one construction section by one construction section width (L1), and referring to the steps 2) to 7), and performing construction of the next construction section;
10) and 8), finishing the construction of all construction sections.
In 2017, the construction technology of the patent is applied to the construction of the modified soil anti-skidding retaining wall for treating the muddy rock weathered slope with the side slope middle and deep layer landslide at the site of the project department of a certain highway in Guangxi Baise, and the examination of a plurality of heavy rainstorms in one year shows that the patent technology has the advantages of high construction speed, stable pit wall support, easy control of construction quality, low construction cost and the like.
Claims (1)
1. The construction method of the concealed modified soil anti-slip retaining wall comprises the following steps that (1) the wall body of the concealed modified soil anti-slip retaining wall is composed of modified soil; the solid weight mixing ratio of the modified soil is 10% of cement, 3% of water glass and 87% of high liquid limit soil material for landslide excavation; dividing a concealed type modified soil anti-skid retaining wall into a plurality of construction sections (1-a) with the length of L1 according to the excavation construction procedure; the single construction section (1-b) with the length of L1 comprises a main excavation area (7) and an auxiliary excavation area (6); the main excavation region (7) comprises two regions, namely a main excavation upper layer region (1) positioned on the upper layer (h1) and a main excavation lower layer region (5) positioned on the lower layer (h2), and is distributed in the design width range of the anti-skid retaining wall of the modified soil; the auxiliary excavation region (6) comprises an auxiliary excavation upper layer region (2) positioned at the uphill direction of the upper layer (h1), an auxiliary excavation upper layer region (3) below the downhill direction side and an auxiliary excavation upper layer region (4) right below the downhill direction, and is a construction range increased for auxiliary construction; the construction method of the concealed modified soil anti-slip retaining wall is characterized by comprising the following construction steps:
1) selecting a construction section with the length of L1, digging an auxiliary excavation upper layer area (2) in the upward slope direction of a main excavation upper layer area (1) by using the plane size with the length of L1 of 5m and the width of b1 of 3m and the depth of 5m, sprinkling the dug high-liquid limit soil material to a soft and plastic state, mixing and proportioning the cement, the water glass and the high-liquid limit soil according to the solid weight of 10% of cement, 3% of water glass and 87% of high-liquid limit soil, and mixing uniformly on site by using an excavator, wherein the mixed cement modified soil material is in a hard and plastic state;
2) the mixed modified soil materials are used for backfilling the auxiliary excavation upper layer area (2) in the uphill direction to the ground surface layer by layer, the single-layer virtual pavement thickness is 70cm, the width b1 is 3m, the compaction is carried out by adopting an excavator bucket, the compaction times are not less than 6 times, the thickness is not more than 50cm, the modified soil body can be hardened after the backfilling compaction by layer is completed for 1 day, and thus a temporary supporting structure for the main excavation upper layer area (1) is formed;
3) excavating a main excavation upper layer area (1) according to excavation sizes of length b, width L1 and depth h 1;
4) excavating an auxiliary excavation upper layer region (3) below the downhill azimuth side by using plane dimensions with the length L1 of 5m and the width b1 of 3m, and depth dimensions with the starting depth of the left end of 0m and the ending depth of the right end of 5m, and excavating an auxiliary excavation upper layer region (4) directly below the downhill azimuth by using plane dimensions with the length L1 of 5m and the width b1 of 3m, and depth dimensions with the depth of 5 m;
5) the method comprises the following steps that an excavator is driven to move from an auxiliary excavation upper layer area (3) below the excavated downhill direction side to the bottom of an auxiliary excavation upper layer area (4) right below the downhill direction;
6) digging a main excavation lower layer area (5) by the length b, the width L1 and the depth h2, and carrying out layered backfilling by using the mixed modified soil material, wherein the requirements of single-layer virtual pavement and compaction are the same as those of the step 2);
7) referring to the step 6), backfilling the main excavation upper layer area (1);
8) referring to the step 6), backfilling an auxiliary excavation upper layer area (3) below the side of the downhill position and an auxiliary excavation upper layer area (4) right below the downhill position, and completing all construction of a first construction section;
9) selecting the next construction section according to the principle of separating the width L1 of the construction section, and referring to the steps 1) to 8), finishing the construction of the next construction section;
10) and step 9) finishing the construction of all construction sections.
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| JP3030604B2 (en) * | 1995-02-03 | 2000-04-10 | 西武建設株式会社 | Inside slope structure of waste disposal site |
| CN103088834B (en) * | 2013-02-01 | 2014-11-12 | 河海大学 | Method for improving slope stability of expansive soil and controlling structural damage of expansive soil |
| CN103572765B (en) * | 2013-11-19 | 2015-04-08 | 苏州荣帆建设工程有限公司 | Treatment and construction method of bridge site river bank expansive soil landslide positions |
| CN104674842B (en) * | 2015-02-13 | 2016-06-01 | 福建省建专岩土工程有限公司 | Solidified earth barricade and constructional method thereof |
| CN106351239B (en) * | 2016-10-28 | 2018-11-27 | 长沙理工大学 | A kind of modified cement soil strengthens geogrids reinforced earth structure and its construction method |
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