CN111832109A - Design method of rock slope gravity type retaining wall without camber structural surface - Google Patents

Design method of rock slope gravity type retaining wall without camber structural surface Download PDF

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CN111832109A
CN111832109A CN202010676349.2A CN202010676349A CN111832109A CN 111832109 A CN111832109 A CN 111832109A CN 202010676349 A CN202010676349 A CN 202010676349A CN 111832109 A CN111832109 A CN 111832109A
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retaining wall
rock
lateral active
resultant force
kpa
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CN111832109B (en
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兰定筠
吴曙光
叶天义
关凯
刘光云
向在兴
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Chongqing University
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    • G06—COMPUTING; CALCULATING OR COUNTING
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    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract

The invention belongs to the technical field of design of a rock slope gravity type retaining wall in civil engineering, and particularly relates to a rock slope gravity type retaining wall design method without an outward-inclined structural surface, which can accurately and conveniently determine the magnitude of lateral active rock pressure resultant force of the rock slope gravity type retaining wall without the outward-inclined structural surface, and has a simple calculation formula; meanwhile, the design method can also determine the strength of the lateral active rock pressure of the gravity retaining wall and the position of the resultant force action point of the lateral active rock pressure, solves the design problem of the rock slope gravity retaining wall, facilitates the specific application of engineering designers, and ensures the design safety of the gravity retaining wall.

Description

Design method of rock slope gravity type retaining wall without camber structural surface
Technical Field
The invention belongs to the technical field of design of a rock slope gravity type retaining wall in civil engineering, and particularly relates to a rock slope gravity type retaining wall design method without an outward-inclined structural surface.
Background
Rock slope gravity retaining walls are common, and have related structural design and application in projects such as buildings and roads, for example, CN108487300A, CN104762978A and CN108487301A in the prior art are all involved.
However, regarding the design of a rock slope gravity type retaining wall without an outward-inclined structural surface, the existing national specification of "building slope engineering technical specification" GB50330-2013 relates to that the magnitude of the lateral active rock pressure resultant force of the gravity type retaining wall can only be determined according to the method provided by the specification, and the calculation formula is complicated, and the strength of the lateral active rock pressure of the gravity type retaining wall and the resultant force action point position thereof cannot be determined, so that the design of the rock slope gravity type retaining wall cannot be completed, and the design problem of the rock slope gravity type retaining wall is not solved.
The design calculation method provided by the invention can simply and conveniently determine the magnitude of the lateral active rock pressure resultant force of the rock slope gravity type retaining wall without the camber structural surface, and the calculation formula is simple; meanwhile, the design method provided by the invention can also determine the strength of the lateral active rock pressure of the gravity type retaining wall and the position of the resultant force action point of the lateral active rock pressure, solves the problem of how to design the rock slope gravity type retaining wall, is convenient for engineering designers to design and use, and ensures the design safety of the gravity type retaining wall.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for designing a rock slope gravity retaining wall without an outward-inclined structural plane, which can effectively solve the design problem of the rock slope gravity retaining wall, and has the effects of simple design and calculation process, convenience for engineering designers to use and capability of ensuring the safety of engineering design.
In order to solve the technical problems, the invention adopts the following technical scheme:
the design method of the rock slope gravity type retaining wall without the camber structural surface comprises the following steps:
1) calculating lateral active rock pressure resultant force E of retaining walla，kN/m；
Figure BDA0002584192220000011
Figure BDA0002584192220000012
Figure BDA0002584192220000021
Wherein H is the height (m) of the retaining wall, and gamma is the weight (kN/m) of the rock mass3) C is rock mass cohesion (kPa), phieThe equivalent internal friction angle (degree) of the rock mass, q the standard value (kPa) of the uniformly distributed load on the earth surface, the friction angle (degree) of the rock mass to the retaining wall back, beta the included angle (degree) of the surface of the rock slope and the horizontal plane, alpha the included angle (degree) of the retaining wall back and the horizontal plane, and Ka0Is an active rock pressure coefficient, KaIs the Coulomb initiative soil pressure coefficient;
2) calculating lateral active rock pressure strength e of retaining walli，kPa；
Figure BDA0002584192220000022
Wherein z isiTo calculate the distance (m), e) of a point from the top of the retaining walliIs a distance z from the wall top of the retaining walliLateral active rock pressure strength (kPa) of the wall at the point of calculation;
3) calculating the position H of the resultant force action point of the lateral active rock pressure of the retaining wallp，m；
Figure BDA0002584192220000023
Wherein HpThe distance (m), e) between the lateral active rock pressure resultant force of the retaining wall and the wall bottom0The lateral active rock pressure strength (kPa) at the top of the retaining wall; e.g. of the typeHThe lateral active rock pressure strength (kPa) at the bottom of the retaining wall.
Compared with the prior art, the invention has the following beneficial effects:
the design method of the rock slope gravity type retaining wall without the camber structural surface can accurately and conveniently determine the magnitude of the lateral active rock pressure resultant force of the rock slope gravity type retaining wall without the camber structural surface, and the calculation formula is simple; meanwhile, the design method can also determine the strength of the lateral active rock pressure of the gravity retaining wall and the position of the resultant force action point thereof, so that the design problem of how to design the rock slope gravity retaining wall is solved, the concrete application of engineering designers is facilitated, and the engineering designers can more scientifically, safely and economically design the rock slope gravity retaining wall without an outward-inclined structural surface; the method is applied to actual engineering, can ensure the safety of engineering, avoids engineering accidents, and protects the life and property safety of the nation and the people.
Drawings
FIG. 1 is a schematic illustration of a gravity retaining wall and a rock slope behind the wall in an embodiment;
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The rock slope gravity type retaining wall design method without the camber structural surface comprises the following specific steps:
1) determining geometrical conditions, physical and mechanical performance parameters and calculation parameters of the gravity type retaining wall and the rock slope behind the wall;
referring to FIG. 1, H is the retaining wall height (m), and γ is the rock mass weight (kN/m)3) C is rock mass cohesion (kPa), phieThe angle of equivalent internal friction of a rock mass is (degree), q is a standard value (kPa) of uniformly distributed loads on the ground surface, is the angle of friction of the rock mass to the retaining wall back, beta is the included angle between the surface of the rock slope and the horizontal plane (degree), and alpha is the included angle between the retaining wall back and the horizontal plane (degree).
2) Calculating the lateral active rock pressure resultant force of the gravity retaining wall;
lateral active rock pressure resultant force E of rock slope gravity type retaining wall without camber structural surfaceaThe calculation is carried out according to the equivalent internal friction angle of the rock mass, and the calculation is deduced according to the coulomb theory formula to obtain:
Figure BDA0002584192220000031
Figure BDA0002584192220000032
Figure BDA0002584192220000033
in the formula, EaThe resultant force of lateral active rock pressure (kN/m) for a gravity retaining wall;
Ka0is the active rock pressure coefficient;
Kais the coulomb active earth pressure coefficient.
3) Calculating the pressure intensity of the lateral active rock of the gravity retaining wall;
lateral active rock pressure resultant force E of gravity type retaining wallaThe height is subjected to derivative calculation to obtain the lateral active rock pressure intensity eiComprises the following steps:
Figure BDA0002584192220000034
in the formula, ziCalculating the distance (m) between the point and the top of the retaining wall;
eiis a distance z from the wall topiLateral active rock pressure strength (kPa).
4) Calculating the position of a resultant force action point of lateral active rock pressure of the gravity type retaining wall;
according to the lateral active rock pressure strength of the gravity retaining wall and the trapezoidal distribution of the lateral active rock pressure strength, the position H of the acting point of the lateral active rock pressure resultant force can be obtainedpComprises the following steps:
Figure BDA0002584192220000035
in the formula, e0The lateral active rock pressure strength (kPa) at the top of the retaining wall;
eHthe lateral active rock pressure strength (kPa) at the bottom of the retaining wall;
Hpthe distance (m) between the lateral active rock pressure resultant force of the retaining wall and the wall bottom.
5) Calculating the anti-slip and anti-overturn of the gravity retaining wall;
the magnitude E of the lateral active rock pressure resultant force obtained according to the calculationaAnd the position of the resultant force acting point HpAnd calculating the anti-sliding and anti-overturning performances of the gravity retaining wall according to the current standard to complete the design of the gravity retaining wall.
Detailed description of the preferred embodiment
The calculation is carried out according to the design method of the invention and the calculation is carried out according to the method specified in the technical Specification for building slope engineering GB50330-2013, and the comparison of the results can be seen in Table 1.
TABLE 1
Figure BDA0002584192220000041
Detailed description of the invention
The calculation is carried out according to the design method of the invention and the calculation is carried out according to the method specified in the technical Specification for building slope engineering GB50330-2013, and the comparison of the results can be seen in Table 2.
TABLE 2
Figure BDA0002584192220000042
The design method of the rock slope gravity type retaining wall without the camber structural surface can simply and accurately determine the magnitude of the lateral active rock pressure resultant force of the rock slope gravity type retaining wall without the camber structural surface; meanwhile, the strength of the lateral active rock pressure of the gravity type retaining wall and the position of the resultant force action point of the lateral active rock pressure can be determined; the design problem of rock slope gravity type barricade is solved, the concrete application of engineering design personnel is facilitated, and the engineering safety is ensured.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (3)

1. A rock slope gravity type retaining wall design method without an outward-inclined structural surface is characterized in that: the method comprises the following steps:
1) calculating lateral active rock pressure resultant force E of retaining walla，kN/m；
Figure FDA0002584192210000011
Figure FDA0002584192210000012
Figure FDA0002584192210000013
Wherein H is the height (m) of the retaining wall, and gamma is the weight (kN/m) of the rock mass3) C is rock mass cohesion (kPa), phieThe equivalent internal friction angle (degree) of the rock mass, q the standard value (kPa) of the uniformly distributed load on the earth surface, the friction angle (degree) of the rock mass to the retaining wall back, beta the included angle (degree) of the surface of the rock slope and the horizontal plane, alpha the included angle (degree) of the retaining wall back and the horizontal plane, and Ka0Is an active rock pressure coefficient, KaIs the Coulomb initiative soil pressure coefficient;
2) calculating lateral active rock pressure strength e of retaining walli，kPa；
Figure FDA0002584192210000014
Wherein z isiTo calculate the distance (m), e) of a point from the top of the retaining walliIs a distance z from the wall top of the retaining walliLateral active rock pressure strength (kPa) of the wall at the point of calculation;
3) calculating the position H of the resultant force action point of the lateral active rock pressure of the retaining wallp，m；
Figure FDA0002584192210000015
Wherein HpThe distance (m), e) between the lateral active rock pressure resultant force of the retaining wall and the wall bottom0The lateral active rock pressure strength (kPa) at the top of the retaining wall; e.g. of the typeHThe lateral active rock pressure strength (kPa) at the bottom of the retaining wall.
2. The method for designing a rock slope gravity retaining wall without an outward-inclined structural surface according to claim 1, wherein the method comprises the following steps: before the step 1), determining the geometric conditions and physical and mechanical property parameters of the gravity type retaining wall and the rock slope behind the wall.
3. The method for designing a rock slope gravity retaining wall without an outward-inclined structural surface according to claim 1, wherein the method comprises the following steps: further comprising a step 4) of calculating the lateral active rock pressure resultant force E of the retaining wall according to the calculated lateral active rock pressure resultant force EaAnd the position H of the pressure resultant force action pointpAnd then, calculating the anti-sliding and anti-overturning of the retaining wall to complete the design of the gravity retaining wall.
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