Method for predicting ultimate bonding strength of pre-stressed anchor cable with anchoring section penetrating through double stratums
A prestressed anchor cable and bond strength technology, applied in the field of geotechnical engineering, can solve problems such as not conforming to the concept of green development, increasing project cost, wasting engineering materials, etc., achieving good engineering application prospects, saving engineering cost, and shortening the construction period Effect
Active Publication Date: 2021-06-18
ZHEJIANG UNIV
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] In addition, in the existing technology, in order to avoid risks and responsibilities in most design methods, designers often take the lower limit of the reference range of ultimate bond strength corresponding to different types of rock and soil recommended by relevant design codes, which is to a certain extent It increases the cost of the project, wastes the engineering materials, does not conform to the concept of green development, so it is not worth promoting, and this kind of design concept should be abandoned
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
specific Embodiment
[0291] Such as Figure 6-7 As shown, the background of the project that this embodiment relies on is as follows: the upper ground and the lower formation that the anchorage section of the prestressed anchor cable crosses are respectively a fine sand layer and a pebble layer, and the thicknesses of the fine sand layer and the pebble layer are 7m and 10m respectively; Length of the anchorage section of the stressed anchor cable L a =22m (wherein, the length L of the anchorage section in the fine sand layer 1 =13m, length L of the anchorage section in the pebble layer 2 =9m), free section length L f =6m, elastic modulus of prestressed anchor cable E=1.95GPa, cross-sectional area of prestressed anchor cable steel strand A=5.6×10 -4 m 2 , Prestressed anchor cable grout stiffness K g = 1.82GPa, the diameter of the prestressed anchor cable borehole D = 0.133m, and the horizontal inclination angle of the prestressed anchor cable borehole β = 25°.
[0292] Step 1: Deduce the th...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method for predicting the ultimate bonding strength of a pre-stressed anchor cable with an anchoring section penetrating through double stratums. The method comprises the following steps: deducing a theoretical relational expression between a pre-stressed anchor cable drawing force P and a pre-stressed anchor cable initial end displacement u when the shear stress state of the anchoring section of the pre-stressed anchor cable is in a full elastic stage, a first partial yield stage, a second partial yield stage and a third partial yield stage under the double-stratum condition; deducing the shear stress state of the anchoring section of the pre-stressed anchor cable under the double-stratum condition, the limit drawing force P of the pre-stressed anchor cable in the whole yield stage and the range of the displacement u of the initial end of the pre-stressed anchor cable; obtaining a Pc-u curve predicted by a theoretical formula according to the Pt-u curve obtained by the field pull-out test; and checking whether the goodness of fit between the Pc-u curve predicted by the theoretical formula and the Pt-u curve obtained by the field pull-out test meets the requirement or not.
Description
technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a method for predicting the ultimate bonding strength of prestressed anchor cables. Background technique [0002] At present, the prediction methods for the ultimate bond strength of prestressed anchor cables mainly include two kinds of test methods and empirical methods; the test methods also include field pull-out tests and indoor model tests. The quantitative relationship between the ultimate bond strength of the anchor cable and the type or basic quality index of the surrounding rock and soil; when using the field pull-out test to predict the ultimate bond strength of the prestressed anchor cable, it is necessary to pull the prestressed anchor cable to failure, and When the anchorage section passes through multiple strata, at least a corresponding number of stratum pull-to-failure field pull-out tests must be carried out, which is time-consuming, laborious and costly. ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17E02D33/00E02D5/74G06F119/14
CPCG06F30/17E02D33/00E02D5/74G06F2119/14E02D2250/0046E02D2600/30
Inventor 郭盼盼龚晓南魏支援赵小晴汪亦显朱成伟
Owner ZHEJIANG UNIV