A method and structure for reinforcing and treating a complex geological foundation

Abstract

The present invention discloses a method and structure for reinforcing and treating a complex geological foundation. The method includes: constructing vibroflotation gravel piles in a complex geology including a bedrock layer and a pebble layer in the direction from the pebble layer to the bedrock layer; when large buried objects and / or large-area solution grooves are encountered during the construction of vibroflotation gravel piles in the complex geology, constructing high-pressure jet grouting piles to form a composite pile body composed of the vibroflotation gravel piles and the high-pressure jet grouting piles in contact or overlapping arrangement in the complex geology, so as to reinforce and treat the complex geological foundation. The present invention overcomes the defect that the vibroflotation gravel piles are blocked by large buried objects in the complex geology and cannot be used for reinforcing and treating the complex geological foundation, and overcomes the defect that when there are large-area solution grooves in the complex geology, a large amount of gravel materials need to be filled in the vibroflotation gravel piles, resulting in high material costs. It has the effects of improving the bearing capacity of the complex geological foundation and reducing the material costs.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and particularly relates to a method and structure for reinforcing a foundation in complex geology. Background Art

[0002] In the field of foundation reinforcement in construction projects, for the reinforcement treatment of soft foundations, vibroflotation gravel piles can be constructed to prevent foundation settlement. A vibroflotation gravel pile refers to a pile body composed of stones formed in the foundation by using the construction technology of the vibration water jet method. The pile and the original foundation soil together form a composite foundation to improve the bearing capacity of the foundation. The method of reinforcing the foundation with vibroflotation gravel piles is generally applicable to soft soil layers, and it has the advantages of simple technology, short pile-forming time, and low construction cost. However, in the face of complex geology where there is a pebble layer covering the bedrock layer, especially when large buried objects such as large boulders and large pebbles are encountered in the pebble layer, the vibroflotation gravel piles are blocked by the buried objects, resulting in the inability to continue constructing downward to the bedrock layer and the inability to reinforce the foundation in complex geology. In addition, when there are large-area solution grooves in the pebble layer or the bedrock layer, a large amount of gravel needs to be filled during the construction of vibroflotation gravel piles, which leads to an increase in the material cost, labor cost, and equipment cost of the construction. Therefore, how to reinforce the foundation in the complex geology composed of the bedrock layer and the pebble layer at a low cost is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method and structure for reinforcing a foundation in complex geology to solve the problem that the foundation in complex geology cannot be reinforced when there are large buried objects or large-area solution grooves.

[0004] To solve the above technical problem, the technical solution provided by the present invention is: a method for reinforcing a foundation in complex geology, constructing vibroflotation gravel piles along the direction from the pebble layer to the bedrock layer in the complex geology including the bedrock layer and the pebble layer; when large buried objects and / or large-area solution grooves are encountered during the construction of vibroflotation gravel piles in the complex geology, constructing high-pressure jet grouting piles to form a composite pile body composed of the vibroflotation gravel piles and the high-pressure jet grouting piles in contact or overlapping arrangement in the complex geology, so as to reinforce the foundation in complex geology.

[0005] Furthermore, for the method for reinforcing a foundation in complex geology provided by the present invention, when large-area solution grooves are encountered during the construction of vibroflotation gravel piles, the high-pressure jet grouting piles are constructed by passing through or avoiding the large-area solution grooves, and the high-pressure jet grouting piles are arranged in contact or overlapping with the vibroflotation gravel piles for construction, so as to form a composite pile body composed of the vibroflotation gravel piles and the high-pressure jet grouting piles in contact or overlapping arrangement in the complex geology, and reinforce the foundation in complex geology.

[0006] Furthermore, for the complex geological foundation reinforcement method provided by the present invention, when the vibroflotation gravel pile encounters a large buried object during construction and is blocked from continuing to form a pile downward, a high-pressure jet grouting pile is constructed along the edge of the large buried object or avoiding the large buried object, so that the high-pressure jet grouting pile and the vibroflotation gravel pile are in contact or overlapping for construction, so as to form a composite pile body composed of the contact or overlapping arrangement of the vibroflotation gravel pile and the high-pressure jet grouting pile in complex geology, and reinforce the complex geological foundation.

[0007] Furthermore, for the complex geological foundation reinforcement method provided by the present invention, when the vibroflotation gravel pile encounters both a large buried object and a large-area solution cavity during construction, the high-pressure jet grouting pile is constructed by passing through or avoiding the large-area solution cavity and avoiding the large buried object or along the edge of the large buried object, so that the high-pressure jet grouting pile and the vibroflotation gravel pile are in contact or overlapping for construction, so as to form a composite pile body composed of the contact or overlapping arrangement of the vibroflotation gravel pile and the high-pressure jet grouting pile in complex geology, and reinforce the complex geological foundation.

[0008] Furthermore, for the complex geological foundation reinforcement method provided by the present invention, when the area of the large buried object is so large that the high-pressure jet grouting pile cannot be avoided, an intermediate pile body is constructed to make the high-pressure jet grouting pile and the vibroflotation gravel pile in contact to form a composite pile body.

[0009] Furthermore, for the complex geological foundation reinforcement method provided by the present invention, the intermediate pile body is a high-pressure jet grouting pile or a vibroflotation gravel pile.

[0010] Furthermore, for the complex geological foundation reinforcement method provided by the present invention, the pebble layer is deep, and when the pebble layer is greater than the reference depth, it is deep.

[0011] To solve the above technical problems, another technical solution provided by the present invention is: a complex geological foundation reinforcement structure, in a complex geological environment with large buried objects and / or large-area solution cavities, a composite pile body composed of the contact or overlapping arrangement of vibroflotation gravel piles and high-pressure jet grouting piles is provided.

[0012] Furthermore, for the complex geological foundation reinforcement structure provided by the present invention, the high-pressure jet grouting pile is arranged by passing through or avoiding the large-area solution cavity; and / or the high-pressure jet grouting pile is arranged along the edge of the large buried object or avoiding the large buried object.

[0013] Furthermore, for the complex geological foundation reinforcement structure provided by the present invention, the composite pile body includes an intermediate pile body in contact or overlapping arrangement between the vibroflotation gravel pile and the high-pressure jet grouting pile.

[0014] Compared with the prior art, the beneficial effects of the above technical solutions of the present invention are as follows:

[0015] A method and structure for reinforcing and treating a complex geological foundation provided by the present invention, when there are large buried objects such as large boulders and large cobbles and / or large-area solution grooves in complex geology, a composite pile body composed of vibroflotation gravel piles and high-pressure jet grouting piles in contact or overlapping arrangement is formed in the complex geology to reinforce and treat the complex geological foundation. The high-pressure jet grouting pile is used to reinforce the vibroflotation gravel pile to improve the bearing capacity of the complex geological foundation. The present invention overcomes the defect that the vibroflotation gravel pile is blocked by large buried objects such as large boulders and large cobbles in complex geology and cannot be used for reinforcement treatment of the complex geological foundation through the composite pile body. The present invention overcomes the defect that when there are large-area solution grooves in complex geology, a large amount of gravel materials need to be filled in the vibroflotation gravel pile, resulting in high material costs through the composite pile body. Therefore, the present invention has the effects of being able to reinforce and treat the complex geological foundation, improving the bearing capacity of the complex geological foundation, and reducing material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional structure diagram of complex geology in an embodiment of the present invention;

[0017] Figures 2 to 5 is a schematic diagram of the process of constructing a composite pile body when there is a large-area solution groove in an embodiment of the present invention;

[0018] Figures 6 to 9 is a schematic diagram of the process of constructing a composite pile body when there are large buried objects in an embodiment of the present invention;

[0019] Figures 10 to 12 is a schematic diagram of the process of constructing a composite pile body when there are large buried objects and large buried objects in an embodiment of the present invention;

[0020] Figure 13 is a flowchart of a method for reinforcing and treating a complex geological foundation in an embodiment of the invention;

[0021] As shown in the figure:

[0022] 100, vibroflotation gravel pile; 200, high-pressure jet grouting pile; 300, bedrock layer; 400, pebble layer; 500, solution groove; 600, large buried object; 700, intermediate pile body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention will be described in detail below with reference to the accompanying drawings:

[0024] The complex geology in the embodiments of the present invention sequentially includes a bedrock layer 300 and a pebble layer 400 from bottom to top. Among them, the pebble layer 400 can be shallow or deep. When the pebble layer 400 is less than the reference depth, it is shallow; when the pebble layer 400 is greater than the reference depth, it is deep. The reference depth can be from 2 meters to 4 meters.

[0025] Please refer to Figure 13 , and in combination with Figures 1 to 12 , the embodiments of the present invention provide a method for reinforcing and treating a complex geological foundation, including:

[0026] Step 810, please refer to Figure 2 、 Figure 6 , in the complex geology including the bedrock layer 300 and the pebble layer 400, construct vibroflotation gravel piles 100 along the direction of the pebble layer 400 towards the bedrock layer 300;

[0027] Step 820, please refer to Figures 2 to 5 、 Figures 6 to 9 、 Figures 10 to 12 , when large buried objects 600 and / or large-area solution grooves 500 are encountered during the construction of vibroflotation gravel piles 100 in the complex geology, construct high-pressure jet grouting piles 200 to form a composite pile body composed of the vibroflotation gravel piles 100 and the high-pressure jet grouting piles 200 in contact or overlapping arrangement in the complex geology, so as to reinforce and treat the complex geological foundation.

[0028] Please refer to Figures 3 to 5 、 Figures 7 to 9 and Figures 10 to 12 , the embodiments of the present invention provide a complex geological foundation reinforcement and treatment structure based on the above complex geological foundation reinforcement and treatment method, and a composite pile body composed of the vibroflotation gravel piles 100 and the high-pressure jet grouting piles 200 in contact or overlapping arrangement is set in the complex geological environment with large buried objects 600 and / or large-area solution grooves 500. The complex geology sequentially includes a bedrock layer 300 and a pebble layer 400 from bottom to top.

[0029] A method and structure for reinforcing and treating a complex geological foundation provided by an embodiment of the present invention, when there are large buried objects 600 such as large boulders and large cobbles and / or large-area solution grooves 500 in the complex geology, a composite pile body composed of vibroflotation gravel piles 100 and high-pressure jet grouting piles 200 in contact or overlapping arrangement is formed in the complex geology to reinforce and treat the complex geological foundation. The high-pressure jet grouting pile 200 is used to reinforce the vibroflotation gravel pile 100 to improve the bearing capacity of the complex geological foundation. The embodiment of the present invention overcomes the defect that the vibroflotation gravel pile 100 is blocked by large buried objects 600 such as large boulders and large cobbles in the complex geology and cannot be used for reinforcing and treating the complex geological foundation through the composite pile body. The embodiment of the present invention overcomes the defect that when there are large-area solution grooves 500 in the complex geology, a large amount of gravel materials need to be filled in the vibroflotation gravel pile 100, resulting in high material costs through the composite pile body. Therefore, the embodiment of the present invention has the effects of being able to reinforce and treat the complex geological foundation, improving the bearing capacity of the complex geological foundation, and reducing the material cost.

[0030] Please refer to Figures 2 to 5 , the method for reinforcing and treating a complex geological foundation provided by an embodiment of the present invention, the step 820 includes: when the vibroflotation gravel pile 100 encounters a large-area solution groove 500 during construction, the high-pressure jet grouting pile 200 is constructed by passing through or avoiding the large-area solution groove 500, so that the high-pressure jet grouting pile 200 is in contact or overlapping with the vibroflotation gravel pile 100 for construction, so as to form a composite pile body composed of the vibroflotation gravel pile 100 and the high-pressure jet grouting pile 200 in the complex geology to reinforce and treat the complex geological foundation. Please refer to Figures 3 to 5 , the structure for reinforcing and treating a complex geological foundation provided by an embodiment of the present invention, the high-pressure jet grouting pile 200 is arranged by passing through or avoiding the large-area solution groove 500. In the embodiment of the present invention, the high-pressure jet grouting pile 200 is used to pass through or avoid the large-area solution groove 500, which can avoid the gravel filling in the construction of the vibroflotation gravel pile 100 when encountering the large-area solution groove 500, reduce the gravel filling amount, and reduce the material cost. And when the bearing capacity of the complex geological foundation is insufficient due to the insufficient construction depth of the vibroflotation gravel pile 100, the high-pressure jet grouting pile 200 is used to reinforce the depth and bearing capacity of the vibroflotation gravel pile 100, thereby improving the bearing capacity of the complex geological foundation. In the embodiment of the present invention, the depth of the high-pressure jet grouting pile 200 constructed to the bedrock layer 300 is 20 cm, and the construction can be continued deeper according to actual needs.

[0031] Please refer to Figures 6 to 9, in the complex geological foundation reinforcement treatment method provided by the embodiment of the present invention, the step 820 includes: when the vibro gravel pile 100 encounters a large buried object 600 during construction and is blocked and unable to continue to form a pile downward (vibro gravel pile 100), construct a high-pressure jet grouting pile 200 along the edge of the large buried object 600 or avoiding the large buried object 600, so as to form a composite pile body composed of the vibro gravel pile 100 and the high-pressure jet grouting pile 200 in contact or overlapping arrangement in the complex geology, and reinforce the complex geological foundation. Please refer to Figures 6 to 9 , a complex geological foundation reinforcement treatment structure provided by the embodiment of the present invention, the high-pressure jet grouting pile 200 is arranged along the edge of the large buried object 600 or avoiding the large buried object 600. Among them Figure 6 is that the vibro gravel pile 100 encounters a large buried object 600 during construction and is blocked and unable to continue to form a pile downward; Figure 7 is to construct the high-pressure jet grouting pile 200 along the edge of the large buried object 600, so that the composite pile body composed of the vibro gravel pile 100 and the high-pressure jet grouting pile 200 is in an overlapping arrangement of the two. Figure 8 is to construct the high-pressure jet grouting pile 200 avoiding the large buried object 600, so that the composite pile body composed of the vibro gravel pile 100 and the high-pressure jet grouting pile 200 is in a contact arrangement of the two. Please refer to Figure 9 , when the large buried object 600 is so large that the high-pressure jet grouting pile 200 cannot be avoided, an intermediate pile body 700 can be constructed between the high-pressure jet grouting pile 200 and the vibro gravel pile 100, so that the high-pressure jet grouting pile 200 and the vibro gravel pile 100 are in contact arrangement through the intermediate pile body 700 to form a composite pile body. Correspondingly, in the complex geological foundation reinforcement treatment structure provided by the embodiment of the present invention, the composite pile body includes an intermediate pile body 700 in contact or overlapping arrangement between the vibro gravel pile 100 and the high-pressure jet grouting pile 200. Among them, the intermediate pile body 700 can be a high-pressure jet grouting pile 200, a vibro gravel pile 100 or other pile bodies in the field. Since the vibro gravel pile 100 encounters a large buried object 600 and the construction depth in the complex geology is not in place, resulting in insufficient bearing capacity of the complex geological foundation, the high-pressure jet grouting pile 200 is used to reinforce the depth and bearing capacity of the vibro gravel pile 100, thereby improving the bearing capacity of the complex geological foundation.

[0032] Please refer to Figures 6 to 9 , in the complex geological foundation reinforcement treatment method provided by the embodiment of the present invention, the large buried object 600 includes large boulders, large cobbles or hard objects located within the pebble layer 400 and / or the bedrock layer 300. Among them Figures 6 to 9Only an example where the large buried object 600 is located in the pebble layer 400 is illustrated herein. The above composite pile body is equally applicable to the geological environment where the large buried object 600 is located in the bedrock layer 300, and it shall not be used as a limitation of the embodiments of the present invention.

[0033] Please refer to Figures 10 to 12 , for the complex geological foundation reinforcement method provided by the embodiments of the present invention, the step 820 includes: when the vibroflotation gravel pile 100 encounters both the large buried object 600 and the large-area solution cavity 500 during construction, construct the high-pressure jet grouting pile 200 along the edge of the large buried object 600 or avoiding the large buried object 600 and passing through or avoiding the large-area solution cavity 500, so that the high-pressure jet grouting pile 200 is in contact with or overlaps with the vibroflotation gravel pile 100 for construction, so as to form a composite pile body composed of the vibroflotation gravel pile 100 and the high-pressure jet grouting pile 200 in the complex geology to reinforce the complex geological foundation. When encountering both the large buried object 600 and the large-area solution cavity 500 during construction, it not only avoids the gravel filling amount of the large-area solution cavity 500 during the construction of the vibroflotation gravel pile 100, reducing the material cost, but also reinforces the depth and bearing capacity of the vibroflotation gravel pile 100 through the high-pressure jet grouting pile 200, improving the bearing capacity of the complex geological foundation.

[0034] The main purpose of the embodiments of the present invention is to solve the problem that the foundation reinforcement effect of the vibroflotation gravel pile is not ideal in the relatively complex geological conditions where the bedrock layer has large undulations, there are large-area solution cavities, and the pebble layer is relatively thick. A construction method combining jet grouting piles and vibroflotation gravel piles is proposed to reinforce the complex geological foundation, and the goals of wide applicability, economic efficiency, and simple construction are achieved. The embodiments of the present invention solve the problem that the vibroflotation gravel pile cannot be drilled due to the too deep or too shallow bedrock; solve the problem that the verticality of the pile cannot be guaranteed due to the large slope of the bedrock, reduce the construction cost, shorten the construction period, and have good social and economic benefits.

[0035] The present invention is not limited to the above specific embodiments. Any deformation and modification made by those skilled in the art based on the above content shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for reinforcing and treating a complex geological foundation, characterized in that: in a complex geology including a bedrock layer and a pebble layer, vibroflotation gravel piles are constructed along the pebble layer towards the bedrock layer; when large buried objects and / or large-area solution grooves are encountered during the construction of vibroflotation gravel piles in complex geology, high-pressure jet grouting piles are constructed to form a composite pile body composed of the vibroflotation gravel piles and the high-pressure jet grouting piles in contact or overlapping arrangement in the complex geology, so as to reinforce and treat the complex geological foundation; when large-area solution grooves are encountered during the construction of vibroflotation gravel piles, the high-pressure jet grouting piles are constructed through or avoiding the large-area solution grooves, and the high-pressure jet grouting piles are constructed in contact or overlapping with the vibroflotation gravel piles, so as to form a composite pile body composed of the vibroflotation gravel piles and the high-pressure jet grouting piles in contact or overlapping arrangement in the complex geology, and reinforce and treat the complex geological foundation; when the vibroflotation gravel piles cannot continue to be formed downward due to the blockage of large buried objects during the construction process, the high-pressure jet grouting piles are constructed along the edge of the large buried object or avoiding the large buried object, and the high-pressure jet grouting piles and the vibroflotation gravel piles are constructed in contact or overlapping, so as to form a composite pile body composed of the vibroflotation gravel piles and the high-pressure jet grouting piles in contact or overlapping arrangement in the complex geology, and reinforce and treat the complex geological foundation.

2. The complex geological foundation reinforcement treatment method according to claim 1, wherein, when large buried objects and large-area solution grooves are encountered simultaneously during the construction of vibroflotation gravel piles, the high-pressure jet grouting piles are constructed through or avoiding the large-area solution grooves and avoiding the large buried objects or along the edge of the large buried object, and the high-pressure jet grouting piles are constructed in contact or overlapping with the vibroflotation gravel piles, so as to form a composite pile body composed of the vibroflotation gravel piles and the high-pressure jet grouting piles in contact or overlapping arrangement in the complex geology, and reinforce and treat the complex geological foundation.

3. The complex geological foundation reinforcement treatment method according to claim 1 or 2, characterized in that, when the area of the large buried object is so large that the high-pressure jet grouting pile cannot be avoided, an intermediate pile body is constructed to make the high-pressure jet grouting pile and the vibroflotation gravel pile in contact arrangement to form a composite pile body.

4. The complex geological foundation reinforcement treatment method according to claim 3, characterized in that, The intermediate pile body is a high-pressure jet grouting pile or a vibroflotation gravel pile.

5. The complex geological foundation reinforcement treatment method according to claim 1, characterized in that The pebble layer is deep, and when the pebble layer is greater than the reference depth, it is deep.

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