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A variety of distress have appeared in culvert structure in permafrost regions of China, which seriously affects safety of the structure in use.In view of the damage of reinforced concrete slab culvert structure along a highway in Qinghai Province, this paper presented a strengthening method for culvert structure.The corrugated steel pipe is placed in the reinforced concrete slab culvert .
Aeolian Materials transported and deposited by wind Loess.A calcareous, unstratified deposit of silts or sandy or clayey silt transverse by a network of tubes formed by root fibers now decayed.Mounds, ridges, and hills of uniform fine sand characteristically exhibiting rounded grains.
Aeolian sand sample from Tengger desert, located in the southern part of Inner Mongolia (China) was characterized for major elemental composition and mineralogy by EPMA, XRF and XRD methods.The objective of this research was to provide data which would be a guide to aid future beneficiation of this sand, especially for the economic exploitation of feldspar and quartz which have a wide range .
Aeolian sands are widespread in many semiarid to arid areas of the world and often provide the only economic source of construction materials for low-volume roads.Experience in southern Africa over a number of decades has shown that provided aeolian sand materials are correctly selected and constructed, they can make effective subgrade .
At natural state, aeolian sand is loose, which brings some difficulties in the construction of highway engineering in aeolian sand areas.For the aeolian sand slope, the traditional engineering protection has disadvantages of high cost, high labor intensity, and easy aging of engineering materials [1∼3].
Below use by the practice of construction of present embodiment in the drift-sand ground, the forming process of present embodiment is described.At first excavate out foundation pit in the drift-sand ground, formwork in foundation pit is put into cage of reinforcement and basic main material; Adjust the position of basic main material, make .
Those projects pay more attention to aeolian sand strength and bearing capacity, and it .South Inner Mongolia and North Shaanxi province, and is 40,000 square kilometers, as depicted in Fig.The CBR is one of the most commonly used methods to evaluate the strength of a subgrade soil, subbase, or base .
Desert sand is one of the current research hotspots in alternative materials for concrete aggregates.In the process of practical application, compressive strength is an essential prerequisite for studying other properties.Based on the current research situation, a prediction technology of compressive strength of desert sand concrete (DSC) is proposed based on an artificial neural network .
Guideline on the Use of Sand in Road Construction in the SADC Region AFCAP/GEN/028/C InfraAfrica (Pty) Ltd, Botswana CSIR, South Africa .Compaction of subgrade/fill by impact compactor.Vi LIST OF ABBREVIATIONS AASHTO American Association of State Highway and Transport Officials .Aeolian Wind borne; sediments transported and .
In order to solve the problem of aeolian sand subgrade compaction, we studied the technology of impact compaction, applied it to the engineering practice and analyzed its effect with Rayleigh wave.The technology of impact compaction can combine the compaction of potential energy and kinetic energy and make it easier for the materials to reach their elastic stage.
In this paper, we explore an approach for annual-scale transport prediction from the intertidal beach, in which we aggregate the surface conditions of the intertidal beach, in particular moisture content and roughness, and use hourly monitoring data of wind speed and wind direction.For our case study area (Egmond Beach, The Netherlands), we include Argus video imagery in our analysis to .
In-situ penetration tests have been widely used in geotechnical and foundation engineering for site investigation in support of analysis and design.The standard penetration test (SPT) and the cone penetration test (CPT) are two typical in-situ penetration tests.The dynamic cone penetration test (DCPT) shows features of both the CPT and the SPT.
Jan 25, 2017 Wind-shield walls decrease the velocity of wind-drift sand flow in transit.This results in sand accumulating in the wind-shadow zone of both windshield wall and track line, causing severe sand .
Nov 01, 2018 The impacts of aeolian sand deposition along railway embankment on the cooling effectiveness of CRIE can be classified into two categories: 1) the aeolian sand clogging in open CRIE reduces the permeability of CRI to air and the heat extraction in the permafrost subgrade, and 2) the aeolian sand accumulation on open and closed CRIE slopes .
Nov 12, 2014 The sand hazards at Honglianghe River section of Qinghai–Tibet Railway are serious, and the effect of controlling measures is limited because the disaster-causing mechanism is currently unclear.
Oct 30, 2019 Aeolian sand is widely distributed in cold regions.It has a significant influence on infrastructure safety.By now, aeolian sand is treated as a disaster-inducing factor along the Qinghai Tibet Plateau Engineering Corridor.The objective of this study is to explore the feasibility of sand as a geo-material in highway construction in permafrost regions.
Oct 31, 2005 platforms during pavement construction on a poor subgrade: conventional crushed rock (referred to as “breaker run”) and four alternatives (i.Grade 2 granular backfill (referred to as “Grade 2”),, foundry slag, bottom ash, and foundry sand).
On the construction site of the highway, the aeolian sand subgrade was compacted in the condition of natural water content with optimizing construction machines.Its compaction degree reached 96% .
Quality subgrade filler is scare in the construction of highway in the desert area, aeolian sand is selected as subgrade filler which is massive in the desert area, of which the mineral .
Subgrade Enhancement Geosynthetic (SEG) including Geotextile (SEG.SEG is a geotextile or geogrid placed between the pavement structure and the subgrade (the subgrade is usually untreated).The placement of SEG below the pavement will provide subgrade enhancement by bridging soft areas.
The industrial sand industry, which is a strategic emerging industry represented by Xingshui, sand construction, sand-producing agriculture and sand control, has filled the domestic gap.Main technical achievements: After 30 years of innovation and development, Qin Shengyi has formed its own industrialization – 1.
The remediated Aeolian sand had an average unconfined compression strength of 0.66 MPa and an average inner friction angle of 36 at a bacterial concentration in the OD600 range of 0.
The representative aeolian sand taken from Horqin desert freeway is used as Subgrade Material.In this paper, California Bearing Ratio (CBR) and rebound modulus E0 are analyzed by experiments which are based on different aeolian samples with different compaction degree, different dry density and different moisture capacity.Simultaneously, the relation of stress and strain is studied to .
This study investigate the behavior of sand dunes when using it as a subgrade layer in paved roads and investigate the effect of change relative density, modulus of elasticity of sand dunes under moving load, in permanent deformation (rutting) of flexible pavement structure, through using steel model with dimensions 600 mm length, 500 mm width .
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