A Method for Determining the Pore Formation of Cut-off Wall on Steep Bedrock Surface Under Deep Overburden
A technology of deep covering layer and bedrock surface, which is applied in the direction of sheet pile wall, foundation structure engineering, construction, etc., can solve the problems of difficult foundation-cover interface judgment, difficulty in forming grooves, slip drilling in groove section construction, etc., to improve wall Body stability, simple construction, and reduced construction difficulty
Active Publication Date: 2018-03-16
长江三峡勘测研究院有限公司(武汉)
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Problems solved by technology
[0005] The purpose of the present invention is to provide a construction method for rock-socketing on steep slopes of cut-off walls in order to solve engineering problems such as easy misjudgment of the steep foundation-covering interface and difficulty in rock-socketing of the foundation surface of the cut-off wall in the construction of the cut-off wall , this construction method effectively solves the problem that it is difficult to judge the base-cover interface in the steep slope section of the deep and thick covering layer of the cut-off wall, and the construction of the groove section is "slip drilling" and it is difficult to form a groove.
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[0033] The present invention will be further described with a specific embodiment below in conjunction with the accompanying drawings.
[0034] The anti-seepage wall construction is carried out in the SF35 slot section of the dam cofferdam of the Wudongde Hydropower Station on the Jinsha River. The depth of the slot is 63.3-68.9m, and the inclination angle of the foundation-cover interface is about 60°. The overburden part in the groove section adopts conventional percussion drilling technology and wall protection method, and drills to the vicinity of the presumed foundation-covering interface. The drill bit diameter of the percussion drill is φ1.2m, such as figure 1 As shown; after the drilling of the overburden layer 3 is completed, the pilot hole is used to drill with a small diameter of φ110mm, and the method of "two-end control and interpolation correction" is used to determine the interface shape of the base-cover. First construct the pilot holes in the slots 4 at both e...
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The invention provides a method for determining deep covering layer lower slope bed rock surface impervious wall drilling. A bed covering interface is determined mainly according to effective combination of a percussion drill and a pilot hole; and according to the form of the bed covering interface, a foundation surface is determined by using a flat beating method. The method can reduce the construction footage of a pilot hole covering layer, guarantees smooth actuation of subsequent construction, solves the problem of high authentication difficulty of deep covering layer slope section bed rocks, and reduces the construction difficulty of a slope bed covering interface.
Description
technical field [0001] The invention relates to an engineering construction method, in particular to a method for making holes in an anti-seepage wall on a steep bedrock surface under a deep and thick covering layer in engineering survey construction. Background technique [0002] Deep overburden, steep foundation-cover interface, and high hardness of the underlying bedrock are engineering problems often faced in the construction of anti-seepage walls of water conservancy projects in Southwest China. In engineering construction, how to accurately define the foundation-cover interface and determine The foundation surface of the anti-seepage wall is an important technical problem in the field of engineering survey and construction [0003] The material composition of the deep and thick overburden is complex, especially in the canyon area of Southwest my country, where the topography is mostly "V" shaped, and the underlying bedrock burial depth, base-cover interface shape, an...
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IPC IPC(8): E02D5/18
CPCE02D5/18
Inventor 王团乐黄灿新倪凯军肖云华郝文忠刘冲平覃振华张熊王吉亮邓柏松董立
Owner 长江三峡勘测研究院有限公司(武汉)