Anhui and Huaihe River Water Resources Research Institute

Bengbu, China

Anhui and Huaihe River Water Resources Research Institute

Bengbu, China
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Song X.-J.,Anhui and Huaihe River Water Resources Research Institute | Li J.,Chinese Ministry of Water Resources | Qian C.-F.,Anhui and Huaihe River Water Resources Research Institute
Applied Mechanics and Materials | Year: 2012

General triaxial CD and CU tests are conducted to properly understand mechanical property of cement-soil. Experiment data indicate that: (a) different stress paths have some but little influence on the strength of cement-soil; (b) under low confining pressure, cement-soil is similar to highly overconsolidated soil with shear dilatancy property; but under high confining pressure, it is similar to slightly overconsolidated soil; (c) its residual strength increases linearly with the increase of confining pressure, and the residual strength of CD test is greater than that of the CU test; (d) the ratio of residual strength to peak strength increases with the increase of confining pressure, while its increasing rate decreases; (e) the effective stress envelope of CU test and that of CD test are basically identical. © (2012) Trans Tech Publications, Switzerland.


Song X.-J.,Anhui and Huaihe River Water Resources Research Institute | Xu H.-B.,Anhui and Huaihe River Water Resources Research Institute | Zhou W.-Y.,Anhui and Huaihe River Water Resources Research Institute | Wang W.,Shaoxing University
Yantu Lixue/Rock and Soil Mechanics | Year: 2016

To investigate the influence of intermediate principal stress factor b and minor principal stress on stress-strain characteristics of cement-soil, true triaxial tests are conducted under the conditions of constant minor principal stress ?3 and intermediate principal stress factor b. The results show that both the initial tangent modulus and the peak strength of cement-soil have positive correlation with b; however, the correlation between major principal strain at failure state and b is opposite. What's more, there is a linear relationship between the peak strength and b, and the straight slope increases with the minor principal stress. For the same value of b, the initial tangent modulus, the peak strength and the major principal strain of cement-soil increase with increasing minor principal stress. The peak strength linearly rises with confining pressure as b is increased. The stress-strain curve changes gradually from softening type to hardening type, along with the increasing of confining pressure and intermediate principal stress. Failure stress ratio becomes lower due to the increased ?3 and intermediate principal stress factor b. Finally, the parameters of the generalized Mises yield criterion and the generalized Tresca yield criterion are obtained. Comparative analysis shows that the former criterion is superior to the latter criterion to describe the mechanical behavior of the cement-soil. © 2016, Science Press. All right reserved.


Song X.-J.,Anhui and Huaihe River Water Resources Research Institute | Wang W.,Shaoxing University | Xu H.-B.,Anhui and Huaihe River Water Resources Research Institute
Advanced Materials Research | Year: 2011

Strength characteristics play an important role in mechanic behavior of cement-soil. Laboratory tests on cement-soil with 12% cement ratio and 28 d curing time are conducted by using a new multifunctional triaxial apparatus under fixed spherical pressure condition. Seven series spherical pressures are designed to apply, namely 300 kPa, 400 kPa, 500kPa, 600 kPa, 800 kPa, 1000 kPa, and 1200 kPa. At the same time, seven series consolidation pressures are taken into accounted. Tested data show that: (1) the stress-strain curve of cement-soil is characterized by strain softening, and the soften rate is related to confining pressure; (2) shrinkage or dilatancy of cement-soil volume strongly depend on the value of loaded spherical pressure; (3) failure curve of cement-soil is approximately a line and it agrees with the Mohr-Coulumb criterion. The result of this paper is helpful to the numerical analysis and practical engineering design of cement-soil foundation structures.


Wu S.-Y.,Anhui and Huaihe River Water Resources Research Institute | Song X.-J.,Anhui and Huaihe River Water Resources Research Institute
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

The seepage calculations of dams and levees with mound and layer drains on impervious strata are introduced. The slope angle of drain boundary is greater than 90°. The main contents and results are as follows: (1) For the mound drain with the downstream water depth H 2=0, according to the Kochina's theory q/k=μh 0, the reciprocal of ratio μ between the flow quantity and the height h 0 of release point is calculated, and the relevant fitting formula for 1/μ is presented. By means of the transformed hypergeometric function, a formula for the exit gradient and its distributions with slope angles of 90°, 135°, 180° is given. (2) The conformal mapping method is employed to get the critical water depth H C of the mound drain, and its derivation process is much simpler than that of the Novmurov's method. (3) For the mound drain with H 2≥H C, according to the Novmurov's theory ΔL 2=D 1H 2+D 2q/k, the proportional coefficients D 1 and D 2 of additional length of downstream seepage path are calculated, and two fitting formulae for D 1 and D 2 with enough precision are presented. The conformal mapping method is used to get the exact seepage solution in downstream district with mound drains, combined with the corresponding solution by Normurov in the upstream district of dams and levees, an example is calculated accurately to get the flow quantity ratio q/k, height of release point h s, distribution of exit gradient I, coordinates of the whole phreatic line and its inflection points to check the corresponding program of finite element and other approximate methods. (4) For the mound drain with 0


Song X.-J.,Anhui and Huaihe River Water Resources Research Institute | Xu H.-B.,Anhui and Huaihe River Water Resources Research Institute
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

In order to study the mechanical property of cement-soil, the plane strain tests and consolidated drained triaxial (CD) tests are carried out. Characteristics and strength properties of stress-strain curve of cement-soil are discussed. The results show that the stress-strain curve has softening behavior; the softening degree is related to confining pressure and it is obvious under the condition of plane strain state; the strength failure envelopes of both CD test and plane strain test are linear and the Mohr-Coulomb criterion can be applied here; the residual strengths of both CD test and plane strain test increase linearly along with the increase of confining pressure. Moreover, the residual strength of plane strain test is greater than that of CD test; the ratio of residual strength to peak strength increases with the increase of confining pressure and the increasing rate slows down. Under the condition of plane strain, the failure strength is 1.4 to 1.6 times of the CD test result. According to the microstructure and conservation of energy principle, the softening causes of cement-soil are analyzed. The gel material such as cement hydrate is the major factor. The softening characteristic is intensified because of the effect of intermediate principal stress.


Zhang Q.S.,Anhui and Huaihe River water resources research institute
Advanced Materials Research | Year: 2013

Concrete hollow block after being shaped up is possessed of features like strong shrinkage, poor thermal conductivity and repeated contraction after dampness, which leads to many problems in the use of concrete hollow block wall material. This article elaborates the causes of cracks on concrete hollow block wall from multiple perspectives, such as temperature expansion, air shrinkage, construction quality and design structure, and put forward solutions according to the causes from aspects of production, design, construction and technique improvement. © (2013) Trans Tech Publications, Switzerland.


Zhi-nang Y.,Chinese Ministry of Water Resources | Xin-jiang S.,Anhui and Huaihe River Water Resources Research Institute
Applied Mechanics and Materials | Year: 2012

According to the results of cement-soil uniaxial compressive test, consider cement-soil stress-strain relations as a continuous random process, the function of random variable obeys Weibull distribution, and introduce generalized hooke′s law in order to establish Weibull distribution of cement-soil constitutive model, solve the softening problem that a variety of incremental nonlinear elastic models cannot reflect the cement-soil. This paper discussed the parameter character of Weibull distribution model of cement-soil, presented the solving method of parameters of cement-soil Weibull distribution constitutive model, verified by results of test, revealed the rationality of the model and shows that the proposed model is more convenient than other model, have widely application value. © (2012) Trans Tech Publications, Switzerland.


Peng J.,Anhui and Huaihe River Water Resources Research Institute | Zhu L.,Anhui and Huaihe River Water Resources Research Institute
Hydraulic Engineering - Proceedings of the 2012 SREE Conference on Hydraulic Engineering, CHE 2012 and 2nd SREE Workshop on Environment and Safety Engineering, WESE 2012 | Year: 2013

According to field construction conditions, mix proportion of steel fiber reinforce shotcrete is proposed through laboratory and field experiments. The results of the study show that the steel fiber reinforced shotcrete under the optimized design can meet the requirements of compressive strength, tensile strength, flexural strength, bending temper index, temper coefficient, bond strength with surrounding old concrete and other technical indexes. © 2013 Taylor & Francis Group.


Zhang Q.-S.,Anhui and Huaihe River Water Resources Research Institute
2011 International Conference on Remote Sensing, Environment and Transportation Engineering, RSETE 2011 - Proceedings | Year: 2011

Concrete cracking of cement-based materials has been a hot research field, especially for non-load in recent years due to early cracking of particular concern. This paper describes the simulation of the natural environment during construction, the use of flat crack planes, the air in different time periods were pouring concrete slab cracking, observed and recorded later analysis and evaluation of concrete cracking sensitivity of the issue, the results show that: ordinary concrete cracking mix better performance than the ratio of concrete pumping, water conservation was slightly better than the Nature Conservancy, covering the best conservation; plastic stage of the concrete surface pressure change is only the second rub the continuity of the crack, can not resist the final cracking, big slump degree requirements after concrete pouring strictly control the location of cracks should be covered by conservation. © 2011 IEEE.


Shu B.,Anhui and Huaihe River Water Resources Research Institute | Peng J.H.,Anhui and Huaihe River Water Resources Research Institute
Applied Mechanics and Materials | Year: 2014

The paper aims to solve the serious and regular crack problems in underground garage. ANSYS finite element software is applied to set up the overall finite element model on floor-foundation and foundation coupling beam-foundation soil in underground garage. Combined with engineering field detection, factors influencing underground garage floor like underground water level, soil expansion caused by water content change in expansive soil, soil poisson ratio, foundation settlement are taken into consideration to find out the causes of cracks. The study is expected to provide reference for similar cases in other projects. © (2014) Trans Tech Publications, Switzerland.

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