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Xu L.,Hubei Engineering University | Ai X.,Hubei Engineering University | Yu J.,Hubei Engineering University | Li Q.,Wuhan RSM Intelligence Geotechnique Co. | He Y.,Hubei Engineering University
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010

Tunnel construction will cause surface deformation inevitably, which has a negative effect on the surface buildings. According to the construction practice of Wucunshan Tunnel in Xiamen Airport Road, the effect of tunnel construction on the surface masonry buildings is analyzed through field monitoring and finite element simulation. The results show that the excavations of tunnel face CRD1-4 have the most important influence on building settlement. Tunnel excavation has little influence on the building under compact construction, and vice versa. The grouting pressure and grouting amount must be strictly controlled in the construction process. It is better to grouting slowly rather than fast, which can ensure the uniform uplift of the whole building. The most obvious response of building under uneven settlement occurs at the bottom story; and its ability to resist down concave deformation is stronger than that to upper convex deformation. The cracks are mainly distributed around the door and window openings in the longitudinal wall at first floor, developing slantwise along the side of smaller settlement to the side of larger settlement. Moreover, the development of the cracks aggravates with the increase of the differential settlement, and vice versa. 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


Zhang G.-H.,CAS Wuhan Institute of Rock and Soil Mechanics | Chen L.-B.,Fujian Provincial Expressway Construction Headquarters | Qian S.-X.,Xiamen Road and Bridge Construction Group Co. | Cai G.-Y.,Xiamen Road and Bridge Construction Group Co. | And 3 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

The research on the stability of surrounding rock is carried out during the construction, as per twin-side heading method, of large section and small clear-distance tunnels under complex geological condition; through the on-site supervision measure of internal displacements of surrounding rock, vault settlement, pressure of surrounding rock and stress of bolt in combination with the engineering practice of Damaoshan tunnels. When the pilot tunnels start excavating, the variation trend, characteristics and displacement field of displacement inside surrounding rock should be clarified, as well as the mutual influence of neighboring pilot tunnels in construction, mutual adjusting mechanism between surrounding rock and retaining structure and the reason of smaller distortion measured by vault settlement than the actual distortion of surrounding rock, the stress state of retaining structure, stress of bolt, variation relation of surrounding rock displacement. The supervision results indicate the feasibility of existing construction technology and retaining parameter adopted for fault zone of V-grade surrounding rock section of large section and small clear distance tunnels because of controllable surrounding rock distortion, strong retaining structure, safe storage and stable surrounding rock. The method, analysis and conclusion of research will be valuable experience and for reference in design, construction, supervision and further theoretical research on tunnel engineering under similar condition. Source


Kong W.,Hubei Engineering University | He Y.,Hubei Engineering University | Li Q.,Wuhan RSM Intelligence Geotechnique Co. | Wang H.,CAS Wuhan Institute of Rock and Soil Mechanics | Qin W.,CAS Wuhan Institute of Rock and Soil Mechanics
Modern Tunnelling Technology | Year: 2014

Generally, bored tunnels in urban areas are characterized by a shallow depth, a large section, poor surrounding rock, dense buildings above the tunnel, and high-risk construction. Aiming at the safety risk to existing buildings during tunneling construction, the three influential factors of building performance, tunnel condition, and in-situ monitoring data are considered and a two-level fuzzy comprehensive model is established to dynamically evaluate the safety of existing buildings and determine reasonable safeguarding measures for buildings according to evaluation consequences. Using the case of the Wushancun tunnel passing under existing buildings on Chenggong avenue in Xiamen, construction safety was evaluated and relevant measures were adopted according to evaluation consequences, and sound results were achieved. Source


Yang Y.-B.,CAS Wuhan Institute of Rock and Soil Mechanics | Yang Y.-B.,Wuhan RSM Intelligence Geotechnique Co. | Liu M.-G.,CAS Wuhan Institute of Rock and Soil Mechanics | Zhang G.-H.,CAS Wuhan Institute of Rock and Soil Mechanics | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

Based on the construction parameter optimization test of class ∨ surrounding rock of Damaoshan Tunnel, through the on-site monitoring work of blasting vibration velocity, acoustic wave velocity of rock mass and internal displacements of surrounding rock, the damage extent and scope of rock mass of a new large cross-section tunnel constructed by double side-wall heading excavation method next to existing tunnel was studied; and then the construction parameters such as single-cycle footage of pilot tunnel,blasting parameters and so on were optimized. It is shown that the surrounding rock of the tunnel constructed by double side-wall heading excavation method would unavoidably be damaged in a certain degree because of repeating blasting, especially the interlaid rock wall in tunnel groups with closely-spaced. In construction of large cross-section tunnel with double side-wall heading excavation method, it is contradictory to control both damage extent and damage scope. By reducing the single-cycle footage to reduce the blasting velocity, it could only control the damage scope, however, repeated blasting would lead to a greater damage extent, greatly affecting the stability of surrounding rock. On the contrary, through appropriate increasing of the single-cycle footage to control the damage extent, the excessive blasting vibration velocity would lead to greater damage scopes, which greatly affect the safe operation of existing tunnel. Basing on the monitoring result, Therefore, in engineering practices, we should weigh the advantage and disadvantage of both solutions according to the characteristics of the actual project and to determine an optimal compromise. The research method and analysis method of this study could provide reference for the design, construction, monitoring of tunnel project under similar conditions and further theoretical research. Source

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