Jin Kui Li

Deep Horizontal Displacement Measurement Technology in the Application of Foundation Pit Excavation

This paper introduces the measurement principles and techniques of foundation pit’s pile body horizontal displacement. It is based on Dalian Maritime University station’s(Dalian Metro) construction. Then 26 monitoring measuring stations were built around the foundation pit. After 10 months’ measuring the data shows pile body horizontal displacement’s rule during foundation pit dewatering, excavation, support installing and the main structure of the construction. The maximum horizontal displacement conform the relevant requirement. In other words, it ensures the safety of the construction. At the same time, it points out that the pile horizontal displacement monitoring is key index of the information technology construction. Especially during the excavation of foundation, the pile horizontal displacement account for about 60%-80% of all. Steel support plays a significant role in horizontal displacement of the pit wall.

The Surface Deformation Law with Engineering Mechanics Caused by Construction of Tunnels with Large Section and Small Interval

There is a large section tunnel and neighboring tunnels in parallel with cross diaphragm method (CRD) and single excavation by drilling-blasting method at a subway station in Dalian. For the construction of shallow buried tunnels, this article has carried on the numerical simulation analysis of dynamic excavation in order to draw a law of surface deformation due to the interaction effect of CRD and drilling and blasting method by analyzing the surface subsidence in every sequential step. It is concluded that maximum ground settlement point affected by different construction stage and the influence of excavation caused by stress redistribution will keep away from or be close to the large cross section tunnel axis as the reference line whose maximum deviation value is the clear distance of 0.6 times; In different construction stages, the settlement decreases along with the increase of distance far away the maximum ground settlement point; Adjacent tunnel construction has a significant effect on the surface deformation.

Elastic Wave Measurement Technology and its Engineering Application

The velocity and amplitude of elastic wave in the rock mass are dependent on the physical and mechanical properties, as well as the structural and stress state of rock mass. The elastic wave testing technique has become one of the most important approaches in geological engineering and rock mechanics. In order to enhance the analysis and application of elastic wave testing technique, the present paper investigates the elastic wave propagation pattern both in laboratory and in field. The lab tests focus on wave velocity in rock mass and the field work focus on the measurement of longitudinal wave velocity by using double-service elastic wave test. The field tests also include the testing of the roadway surrounding rock loose circle on the edge of underground chamber construction site. The study profiles the rock mass’s elastic wave dynamic characteristics, clarifies the rock mass structures, assess the property of the rock mass surrounding the subway. All these are of great significance to the underground chamber and tunneling engineering design and construction.

Landslide Machanism in Xinghai Zhong Long Yuan and Its Reinforcement Technology

The landslide is a global geological disasters, causing casualties and huge economic losses. This paper, the Dalian Xinghai Zhong Long Yuan landslides treatment project, analysis of landslides generated by internal causes and predisposing factors, obtained a landslide failure mechanism, and the causes of slope cutting, improve cut flood drainage structures, prestressed anchor Mississauga solid technical measures. The construction process for top of the hill horizontal displacement, deep horizontal displacement and anchor bearing capacity monitoring results show that the landslide control program is correct and effective measures to achieve the desired effect, made landslides governance success to reference for landslide control work for the Dalian region and the coastal cities.

Numerical Simulation Method to Analysis of Strengthening Effect in the ZhongLong Park

Landslide is a kind of global geological disasters, causing casualties and huge economic losses to many countries and regions. Analysis on the study of slope stability is very important geotechnical engineering in the field of content. Taking Dalian Xinghai long garden landslide as an example, based on the detailed investigation of geological disasters in Dalian Xinghai area, using the Soilworks software to analyse evaluation of landslide treatment effect.

The Monitoring and Analysis of Surface Subsidence of Soft Soil Rock Large Section of Subway Tunnel Shield Construction

In this paper use the shield construction of Dalian subway 202 bid section as an example, carried out the monitoring measurement of surface subsidence and crown surface subsidence during the shield construction, detailed analysis the monitoring data, explored the characteristics and distribution of surrounding rock and surface deformation of large cross section shield construction. Construction transverse deformation has a relationship with lateral position and the tunnel excavation length. The closer from shield machine working face, the closer to the center line of the tunnel, the greater impact is. The research results have reference value for the future similar engineering design and construction.

Analysis of Dalian Subway Tunnel Shield Construction Impact with Engineering Materials and Engineering Mechanics on Existing Bridge Pier

In the 202 section of subway shield Dalian interval in close proximity to existing bridge as the basis, the surface settlement and bridge pier settlement observation station are established. By the 62 day of the crossing construction monitoring, the monitoring data are analyzed in detail. When surface subsidence induced by shield tunnel construction, above the measuring point start speed is faster than settling startup speed measuring points on both sides, about 2-2.5 times, subsidence range higher about 8 to 10 m ahead of time. Away from the pier side first started, and start faster than the side near the pier ,is about 1.2 times , settlement of shield construction are mainly concentrated in the distance before and after the excavation of shield machine 10 m, accounting for 80.72%-81.6% of the total settlement . At highest risk for shield construction area, we should strengthen monitoring and make contingency plans in a timely manner.

The Effect of Specimen's Height on the Point Load Test

In order to use different size of the rock in the site point load tests, select the same site at the scene of specimen do load test research. Through the statistical analysis of 9 groups of the point load strength index data, demonstrates the influence of the test specimen size and shape sample size and shape to rock point load test results, and draws the influence rule of the specimen height to the point load test. The research has the vital significance for underground engineering design and construction.

Influence of Fiber’s Surface State on Mechanical Properties and Fiber-Matrix Interaction of CFRP

In order to investigate the influence of carbon fiber’s surface state on the mechanical properties and the fiber-matrix interaction of CFRP, the change of surface state was achieved by thermal treatment of carbon fibers at elevated temperatures, and the surface state was characterized by XPS. The mechanical properties were measured from the flexural test. The CFRP reinforced with 600 °C treated fabrics containing the highest reactive functional groups, showed the highest flexural strength and modulus. But in the case of CFRP reinforced with 1500 °C treated fabrics containing the lowest reactive functional groups, exhibited the lowest flexural strength and modulus. Combining the mechanical properties with the microstructure analysis, the results indicated that the fiber-matrix interaction (strong or weak) depends on the relative percentage of reactive functional groups present on the carbon fiber surface.

Analysis of Construction Monitoring of Jinzhou Underground Mall Excavation

Cause the deformation of soil around the foundation pit excavation, have a great impact on the surrounding environment. At the same time, the excavation is limited by surrounding environmental conditions. Relying on the Jinzhou underground mall excavation monitoring project, after monitoring the ground settlement and horizontal displacement of pile top and measurement during the construction period, we realize the real-time information construction ,safe and smooth construction in the process of construction. And we conclude some useful conclusions, which can be a reference for similar engineering and reference.