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Pang T.,Beijing Jiaotong University | Pang T.,Xiamen Road and Bridge Construction Group Co. | Fang Y.,Water Resources Bureau of Xianning | Qin W.,CAS Wuhan Institute of Rock and Soil Mechanics
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013

Taking the deep foundation pit of open-cut tunnel in Xiamen City for example, safety monitoring is carried out on the surrounding environment as well as on supporting structure itself during the construction period. The monitoring measures for the safe construction of deep foundation pit mainly include tour check, settlement, horizontal displacement, deep displacements, underground water level, axial stress of anchor and blasting vibration, etc.. Combined with the geology condition and in-situ construction environment, the monitoring results are comprehensively analyzed on the surrounding environment as well as on supporting structure. Research results show that geology condition is the main factor that causes the difference of deformation distribution. Large displacement will appear after the creation of new free face, so the stability of the retaining pile are affected. When the blasting excavation is applied on the deep foundation pit, the selection of design parameters are demanded to further verify their rationality. Monitoring and analysis are carried on dangerous situation such as high displacement velocity of the supporting pile, landslide and collapse of slope etc.; and the monitoring results show that emergency measures relevant to the dangerous situation are reasonable and effective. Source


Qin W.,CAS Wuhan Institute of Rock and Soil Mechanics | Zhao R.,Xiamen Road and Bridge Construction Group Co. | Wang H.,CAS Wuhan Institute of Rock and Soil Mechanics | Kong W.,Hubei Engineering University
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010

Wucun tunnel in Xiamen City is shallow-buried large-span tunnel with soft rock, which underpass intensive buildings. The research work of combining numerical simulation with on-site monitoring is conducted in the process of tunnel construction. According to the results of finite element analysis and on-site monitoring data, combining with construction measures, comprehensive research are carried out on the safety of building during the construction. The research results show that the strength of completely decomposed granite can be improved by full-face curtain grouting, but it has little effect on uplifting the above building. Nevertheless, surface grouting has obvious effect on controlling the settlement of the above building, and the accumulative settlements of most monitoring points are less than 30 mm, which meet the design requirements. Because of the insufficient grouting equipment, the building can not be overall uplifted by surface grouting, which leads new cracks to appear and make the original cracks alive. CRD(center cross diagram) method is adopted to underpass the building, and its construction order should be CRD1 → CRD2 → CRD3 → CRD4, which has certain effectivemess on the control of the above building settlement. Source


Chen T.-L.,Beijing Jiaotong University | Zhang D.-L.,Beijing Jiaotong University | Zeng C.,Xiamen Road and Bridge Construction Group Co. | Ying G.-G.,Beijing Jiaotong University
China Ocean Engineering | Year: 2013

As a kind of transportation mode for crossing channels, undersea tunnel has incomparable advantages for its directness, convenience, fastness, insusceptibility to weather conditions, and smaller influences on environments. In recent years, with the development of undersea tunnel construction, the design and construction technologies have been greatly enhanced. The first undersea tunnel in China has just been built. Waterproofing is the key technique of undersea tunneling. A new concept of waterproofing scheme of grouting, sealing, draining and divided sections was adopted in the construction of the tunnel based on the researches, the in-situ geological features, the astuteness of the current technology, and the cost of construction. The structural details of the sealing and draining system are introduced to illustrate the salient features of the new waterproofing technique. It is hoped that experiences described in the paper can offer guidance for the construction of the extensive undersea tunnels in the coming years. © 2013 Chinese Ocean Engineering Society and Springer-Verlag Berlin Heidelberg. Source


Tan Z.,Beijing Jiaotong University | Zeng C.,Xiamen Road and Bridge Construction Group Co. | Li J.,Beijing Jiaotong University | Du C.,Beijing Jiaotong University | Zhang P.,Beijing Jiaotong University
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2011

There have been arguments about water pressure on tunnel linings, due to the complexity and plethoric interfering factors. Based on the Xiamen Xiang'an sea tunnel project, similarity model test of a larger scale and advanced fiber grating technology was conducted to explore the water pressure distribution under various drainage conditions, the force characteristics of the lining under the effect of the water pressure and rock stress, and the water pressure distribution and force characteristics of the lining for the procedure of tunnel primary lining construction. This paper illustrates from the model tests that the water pressure cannot be reduced by lining and grouting ring for the whole block waterproof method, the water pressure reduces with the rising drainage for whole drainage. Comparing with significant superposition of the seepage field and stress field, the scope and value of tunnel lining structure enlarge markedly under the effect of the water pressure and rock stress, and the water pressure play the leading role, the invert is the most unfavorable position. When simulating the procedure of construction, it is found that the influence scale of tunnel excavation is about 2 time of the diameter of tunnel and the primary support only bear part of water pressure. Source


Qin W.,CAS Wuhan Institute of Rock and Soil Mechanics | Li Q.,Wuhan RSM Intelligence Geotechnique Co. | Ren W.,CAS Wuhan Institute of Rock and Soil Mechanics | Liang C.,Xiamen Road and Bridge Construction Group Co. | Yang Y.,Xiamen Road and Bridge Construction Group Co.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010

Wucun tunnel is a two-way and six-lane tunnel with complex structure in Xiamen City, which is composed of double-arch tunnel, small-distance tunnel, initially supported multi-arch tunnel and split tunnel. Vault settlement and convergence of surrounding rock are the main in-situ monitoring work, and the monitoring results are comprehensively analyzed combined with the measures and procedures of tunnel excavation. Research results show that vault settlement in main tunnel is less than half of that in guide hole in three-hole method construction area; and it is shown that the double-arch structure is applicable to the tunnel with higher settlement control requirement. Vault settlement derived from CRD1 can exceed half of the total value settlement during the excavation period. If the measuring point is embedded after excavation of core soil, the lost settlement will be approximately 37.5% of the total. Surrounding rock can be reinforced by full-face curtain grouting, which achieves better control in vault settlement than in convergence of surrounding rock. Under the influence of dead weight and larger cross-section of pipe roof chamber, larger vault settlement appears in pipe roof area. The removal of temporary support has less impact on the displacement of surrounding rock. Construction factors such as excavation mainly lead to larger convergence deformation as well as grouting; the latter produces a greater impact. Excavation in right tunnel has a certain impact on secondary lining in left tunnel. Source

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