Design Method of Bolt Support Length for Multi-layer Slope
A technology of bolt support and design method, applied in construction, infrastructure engineering, sheet pile wall and other directions, can solve the problems of excessive design, waste of materials, inability to achieve support effect, etc., and achieve the effect of optimized design
Active Publication Date: 2017-07-28
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology
In addition, for conservative design, a row of anchor rods is generally designed at a certain distance along the height direction of the slope, which has the problem of over-design, which not only wastes materials, but sometimes cannot achieve a certain supporting effect
There is a lack of a systematic and reasonable design method for the determination of the most dangerous sliding surface position of multi-layer slopes and the reasonable design of the slope bolt support length
Method used
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[0037] The present invention will be further described below in conjunction with accompanying drawing.
[0038] Such as figure 1 Shown, multilayer slope bolting length design method of the present invention, the present invention determines the concrete process of multilayer slope bolting length as:
[0039] Step 1: First, determine the stratification of the slope based on field survey (delamination thickness D i ), the bulk density of each layer of material was determined on the basis of indoor geotechnical tests γ i , internal friction angle and cohesion c i The average value μ γi , mu ci with standard deviation σ γi , σ ci ; i=1, 2, . . . , n. n is the number of layers; record variables where m=3n.
[0040] Step 2: In each layer of the slope, the original layer is subdivided into a certain number of small layers at intervals of 0.5m i , n i =D i / 0.5.
[0041] Step 3: Based on the assumption of circular arc sliding, use uniform random numbers to genera...
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The invention relates to a design method for the support length of a multi-layer side slope anchor rod and belongs to the technical field of stabilizing of a side slop or a slope, aiming at solving the problem of unreasonable design of the prior art. The method comprises the following steps: determining the layering situation of a side slope on the basis of field exploration; refining original layers into a certain number of small layers with same intervals; forming a feasible sliding arc area by utilizing uniform random numbers; calculating the safety coefficients and the reliability index values by utilizing a simplified Bishop method in a limit equilibrium analysis method; acquiring a dangerous sliding surface; calculating the ratio between the invalid sample Ni of each dangerous sliding surface and the summation of all invalid samples; and sequencing according to the ratio, and determining the support length by combination of the specific position of the dangerous sliding surfaces and the angle of an anchor rod. According to the invention, by quantifying the proportion of each dangerous sliding surface in landslide risk, the support length of the anchor rod can be scientifically and reasonably designed, and finally optimal design of the support length of the multi-layer side slope anchor rod can be realized.
Description
technical field [0001] The invention relates to a method for designing the length of multi-layer slope bolt support, and belongs to the technical field of slope or slope stabilization. Background technique [0002] There are many types of slopes in geotechnical engineering in my country. Except for a small number of homogeneous and simple slopes, most slopes are multi-layered due to complex geological history. The stability evaluation and support of multi-layered complex slopes The protection method puts forward higher requirements for geotechnical engineering technicians. Landslides of multi-layer slopes occur frequently due to improper design or unreasonable design method of support length. For example, on December 20, 2015, a landslide occurred in the Guangming New District of Shenzhen City, causing hundreds of people to lose contact and die, posing a huge threat to people's lives and social security. In view of this, how to reasonably carry out the support design of mul...
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IPC IPC(8): E02D5/74
CPCE02D5/74
Inventor 李亮褚雪松
Owner QINGDAO TECHNOLOGICAL UNIVERSITY