CN111945675B

CN111945675B - Interval alternate die-increasing longitudinal partition arc-shaped cabin face filling earth-rock dam

Info

Publication number: CN111945675B
Application number: CN202010753265.4A
Authority: CN
Inventors: 刘后露; 王东; 金浩博; 郭广鑫; 周泽泽; 梁勤正
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2020-07-30
Filing date: 2020-07-30
Publication date: 2022-05-17
Anticipated expiration: 2040-07-30
Also published as: CN111945675A

Abstract

An arc-shaped warehouse surface filling earth-rock dam with alternate mold increase at intervals and longitudinal partitions relates to a structure and a construction method for regulating and controlling three-dimensional deformation of the earth-rock dam. The two measures are combined to control the whole deformation of the dam body, particularly the horizontal displacement component from two banks to the center of a river in the three-dimensional deformation of the dam body is reduced, and the safety of the earth-rock dam is better ensured.

Description

Interval alternate die-increasing longitudinal partition arc-shaped cabin face filling earth-rock dam

Technical Field

The invention particularly relates to a structure and a construction method for controlling three-dimensional deformation of an earth-rock dam, particularly axial horizontal displacement components of the dam, and belongs to the technical field of hydraulic engineering.

Background

Along with the repeated innovation and record of the height of the earth-rock dam, the deformation control of the earth-rock dam becomes more and more difficult in industry science and technology, particularly, when the ultra-high earth-rock dam is built in a narrow and deep valley, the safety of a seepage control structure is often influenced by a three-dimensional deformation effect, for example, a panel dam is formed, if the horizontal displacement component of the dam shell in the three-dimensional deformation direction to the river center is too large, the panel is driven to generate overproof extrusion displacement, and therefore the safety of a key seepage control structure panel is threatened.

On the basis of analyzing the extrusion failure mechanism of the face plate dam, the patent ZL2018103462477 provides a scheme that different rolling compaction degrees are longitudinally arranged along the axis of the dam on a dam shell, so that longitudinal deformation mold division is realized, and 'core gathering' deformation is inhibited or reduced. The longitudinal partitioning idea is theoretically feasible, but in practice, the grinding compactness is reduced by the two sides of the dam abutment, the recognition of an engineer is deviated, and the risk of deformation of the peripheral seam of the panel dam also exists. In order to overcome the defects, longitudinal partition is better realized to inhibit the deformation of the 'core-gathering' of the high earth-rock dam, and by referring to the theory and technology (CN 110130278A, CN 109440733A, CN 108018830A and the like) of 'cemented gravel' damming of Giardian and the like of China Water conservancy and hydropower science research institute, in the filling process of an earth-rock dam shell, materials with staggered filling lengths and higher compactness and higher deformation modulus are filled among intervals (or among multiple layers) to realize the partition change of the weighted deformation modulus in the height direction along the axial direction of the dam, and then the arc characteristics of the filling cabin surface in the subject group patent ZL 20181032477 are integrated to comprehensively realize the control of the three-dimensional deformation, particularly the axial horizontal displacement component of the earth-rock dam, and the deformation safety of the high earth-rock dam is better ensured.

Disclosure of Invention

In order to more reliably and comprehensively control the three-dimensional deformation of the earth-rock dam, particularly the 'concentric' deformation component in the axial direction of the dam, the invention designs an interval alternate die-adding longitudinal partition arc-shaped cabin surface filling earth-rock dam structure and a construction scheme. The specific technical scheme for realizing the purpose of the invention is as follows:

the earth-rock dam shell is symmetrically divided into five subareas along two banks of the axial direction of the dam, and the weighting deformation modulus in the subareas on two sides of the dam abutment, the subareas on two sides of the center beside the center position and the central subarea are set to realize the sequential decrease from the central subarea of the dam body to the subareas on two sides by a method of setting a semi-cemented sand gravel filling material interval alternate mold increasing layer.

When the dam body is filled in a layered mode, the traditional layer is rolled through a bin to achieve the design value (or the maximum value) of the test compactness; and arranging a mold increasing layer after separating a plurality of layers. The lengths of the mold-increasing layers are alternately changed in the two side partitions and the central partition of the center according to the elevation, and the rest bin positions are filled with the traditional damming sand gravel material; the material of the mold-increasing layer adopts 'semi-cemented sand gravel filler', the dam building technology, equipment and process of 'cemented sand gravel' of the Chinese institute of water conservancy and hydropower science are used for stirring, paving and rolling the material, the whole cabin surface is rolled, only the material mixing proportion is controlled by the lowest limit of 'guide rule of cemented particle dam building technology', the cement content of the cementing material can be controlled at 32Kg/m³The control, the maximum grain diameter of the sand gravel is controlled according to 300mm, and other indexes are simplified, so that the difference from the traditional dam building material in the production process is reduced to the maximum extent, and the manufacturing cost is controlled. Meanwhile, because the dam shell of the earth and rockfill dam requires certain water permeability, the semi-cemented gravel stone material is higher than cemented gravel although the water permeability is lower than that of original gravel, and the mold-increasing layer is only alternately implemented at intervals in the dam shell, so that a reverse filter layer and a transition layer of the earth and rockfill dam are not involved, and the dam shell can still be comprehensively weightedThe water permeability requirement required by the earth-rock dam is maintained.

The four subarea interfaces are set as nonlinear interfaces according to the shape characteristics of the river valleys and the deformation characteristics of the dam body, and are determined according to the relevant characteristics of deformation analysis in specific implementation.

When the dam body is filled and rolled layer by layer, the bin surface is symmetrically and arc-shaped superfill along the axis direction of the dam, the middle part is high, the two sides are low, and the dam is filled to the dam crest elevation layer by layer. The superfilling curve is determined by the layered settlement of the earth-rock dam body. During the layered rolling construction, each layer of bin surface is not horizontal but symmetrically arched along the axial direction of the dam. The nonlinear superfilling measure ensures that the missing supplementary material source of the subsequent sedimentation part of each section is mostly from the superfilling source of the section, thereby indirectly inhibiting the sedimentation three-dimensional effect of the dam body.

The invention has the advantages of inhibiting and reducing the three-dimensional deformation of the earth-rock dam, particularly the horizontal deformation component in the axial direction of the dam, being beneficial to the deformation safety of the high earth-rock dam and being basic improvement on the panel safety of the panel dam.

Drawings

FIG. 1 is an elevation view of a dam filled with earth and rockfill on an arc-shaped cabin surface of longitudinal partitions with alternately added molds at intervals.

Fig. 2 is a plan view of an arc-shaped storehouse face filling earth-rock dam with alternately increased moulds in longitudinal subareas.

Wherein, 1 is divided into two sides; 2-two side zones of the center; 3-central zone; 4-zoning interface; 5-alternate mold-increasing layers of semi-cemented sand gravel filling materials; 6-superfilling curve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. The scope of the invention is not limited to the description.

The method comprises the steps of firstly, symmetrically dividing an earth-rock dam shell into five subareas along two banks of a dam axis direction, wherein the weighted deformation modulus in the two subareas 1 on two sides of a dam shoulder, the subareas 2 on two sides of the center beside the center position and the (vertical direction) weighted deformation modulus in the center subarea 3 realize that the dam body is sequentially decreased from the center subarea to the two subareas.

The four subarea interfaces 4 are arranged into nonlinear interfaces according to the shape characteristics of the river valleys and the deformation characteristics of the dam body.

When the dam body is filled and rolled in layers, the bin surface is symmetrically and arcuately superfilled along the axis direction of the dam, the middle is high, the two sides are low, the dam is filled to the crest elevation layer by layer all the time, and an superfilling curve 6 is determined by the layered settlement of the dam body of the earth-rock dam.

The proportion of the semi-cemented sand gravel filling is controlled by the lowest line of the technical guide of cemented particle damming, the cement content of the cementing material is controlled according to the upper limit of 32Kg/m3, the maximum particle size of the sand gravel is controlled according to 300mm, and other indexes are simplified, so that the material is kept in a semi-cemented state and has certain water permeability.

The semi-cemented sand gravel filling material is produced according to the guiding rule of cemented particle damming technology, the paving and the rolling are the same as the construction equipment and the process of the traditional earth-rock dam, the rest bin positions of the die-increasing layer are filled with the traditional damming sand gravel material, and the bin-through rolling is implemented.

Claims

1. The method is characterized in that the arch-shaped bin faces of longitudinal subareas of the alternately increased moulds at intervals are filled with earth-rock dams, when the dam bodies are filled and rolled in a layered mode, the bin faces are symmetrically and arc-shaped superfilling along the axis direction of the dam, the middle of the arch-shaped dam is high, the two sides of the arch-shaped dam are low, the arch-shaped dam is filled to the crest elevation layer by layer, an superfilling curve (6) is determined by the layered settlement of the dam bodies of the earth-rock dams, and the material of the increased mould layer adopts semi-cemented sand gravel filling material, and the method is characterized in that: the earth and rockfill dam comprises five subareas, wherein the five subareas are symmetrically distributed on two sides of a dam body along the axial direction of the dam, the two side subareas (1) on the dam shoulder, two side subareas (2) at the center beside the center position and the weighted deformation modulus in the center subarea (3) of the earth and rockfill dam are used for setting a semi-cemented sand and gravel filling material interval alternate formwork increasing layer (5) in the two side subareas at the center and the center subarea, the length of the formwork increasing layer is alternately changed in the two side subareas at the center and the center subarea according to the elevation, and the deformation modulus is sequentially decreased from the center subarea of the dam body to the two side subareas, so that the three-dimensional deformation of the earth and rockfill dam is inhibited, and the horizontal deformation component in the axial direction of the dam is reduced; the four subarea interfaces (4) are set into nonlinear interfaces according to the shape characteristics of the river valleys and the deformation characteristics of the dam body.

2. The interval alternating pattern-increasing longitudinal partition arc-shaped storehouse face filling earth-rock dam as claimed in claim 1, characterized in that: the mixing proportion of the semi-cemented sand gravel filling material is controlled by the lowest limit of the technical guide rule of cemented granule damming, and the cement content of the cementing material is controlled by the upper limit of 32Kg/m³The maximum particle size of the sand gravel is controlled according to 300mm, and other indexes are simplified, so that the material is kept in a semi-cementing state and has certain water permeability.

3. The interval alternating pattern-increasing longitudinal partition arc-shaped storehouse face filling earth-rock dam as claimed in claim 1, characterized in that: the semi-cemented sand gravel filling material is produced according to the guiding rule of cemented particle damming technology, the paving and the rolling are the same as the construction equipment and the process of the traditional earth-rock dam, the rest bin positions of the die-increasing layer are filled with the traditional damming sand gravel material, and the bin-through rolling is implemented.