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1.
通过试验和数值模拟分析,研究了隧道喷射活性粉末混凝土单层衬砌支护技术。并对所采用的混凝土配合比设计以及喷射混凝土单层衬砌的抗渗性和耐久性进行了分析。结果表明,采用喷射活性粉末混凝土单层衬砌取代复合式衬砌,可提高软岩地层隧道的承载和防水能力,改善隧道环境。研究结果可为进一步提高隧道施工和支护技术提供参考。  相似文献   

2.
以小团山隧道挂模湿喷钢纤维混凝土为例,介绍了隧道施工中挂模湿喷混凝土原材料选择、配合比设计、生产要素配置、施工工艺、质量控制、实施效果等方面的技术.  相似文献   

3.
昆-石高速公路隧道单层衬砌高性能喷射混凝土性能研究   总被引:1,自引:0,他引:1  
一些复合式衬砌隧道易渗漏,难整治已成为突出问题,现代隧道技术工艺水平,能够通过科学选择混凝土组成材料与设计配合比,良好的喷射施工控制,获得高抗渗高强度混凝土,即高性能喷射混凝土(HPS)。设计应用HPS单层衬砌,能够延长隧道使用寿命和减少养护维修费用。  相似文献   

4.
喷射成膜防水技术是使用在隧道及地下工程复合衬砌中的一种新型防水技术。对喷膜防水技术CM-1型成膜材料的配方与性能、PM-1型喷膜防水机的功能原理、喷膜防水施工工艺等作了详细介绍,并通过喷膜防水技术在工程试验中的施工操作和性能测试,说明该技术在地下工程复合式衬砌防水施工中具有良好的应用前景。  相似文献   

5.
余成祥 《山西建筑》2006,32(10):135-136
介绍了小团山隧道湿喷钢纤维混凝土中原材料的选择及施工工艺,以改善隧道施工作业的环境质量,并提高生产率,达到湿喷混凝土质量合格标准。  相似文献   

6.
复合式衬砌是近年来隧道工程中广泛使用的一种新型支护结构,防水效果好。本文分析了复合式衬砌的防水机理,介绍了复合式衬砌的防水层结构设计要点,结合具体工程实例,对隧道施工缝、变形缝等隧道防水薄弱环节的防水施工进行了详细的研究。  相似文献   

7.
湿喷混凝土技术在隧道施工中的应用   总被引:1,自引:1,他引:0  
邓尤东 《山西建筑》2003,29(3):79-80
以小团山隧道湿喷钢纤维混凝土为例 ,介绍了隧道施工中湿喷混凝土原材料选择、配合比设计、生产要素配置、施工工艺、质量控制、实施效果等。经过实践证明 ,该技术得到成功应用 ,并取得了较好的效果  相似文献   

8.
湿喷钢纤维混凝土在隧道工程中的应用   总被引:2,自引:0,他引:2  
本文概要介绍了在西安安康铁路椅子山等隧道进行的湿喷钢纤维混凝土衬砌设计、施工情况,及取得的初步成果.对湿喷钢纤维混凝土衬砌的材料、配合比、强度要求、施工工艺等提出了自己的见解.  相似文献   

9.
从隧道衬砌检测结果看施工和设计中的问题   总被引:6,自引:3,他引:3  
分析了70座公路、铁路隧道的衬砌及塌方等检测结果及统计数据,对目前隧道施工管理、施工技术、隧道设计及规范中有必要改进提高的内容;对塌方问题、衬砌及喷层厚度问题、衬砌背后空区、复合式衬砌两层衬砌间空段等问题,从发生原因、避免办法及通过加强施工管理提高经济效益等方面作了归纳,提出了建议.  相似文献   

10.
任国青 《山西建筑》2008,34(12):148-149
就微硅粉钢纤维湿喷混凝土这一新工艺在隧道单层衬砌施工中的应用,进行了系统的总结和阐述,总结分析了实施隧道单层衬砌的控制方法和要点,提出了保证硅粉钢纤维喷射混凝土施工质量的控制途径。  相似文献   

11.
Predicting geological hazards during tunnel construction   总被引:1,自引:0,他引:1  
The complicated geological conditions and geological hazards are challenging problems during tunnel construction,which will cause great losses of life and property.Therefore,reliable prediction of geological defective features,such as faults,karst caves and groundwater,has important practical significances and theoretical values.In this paper,we presented the criteria for detecting typical geological anomalies using the tunnel seismic prediction(TSP) method.The ground penetrating radar(GPR) signal response to water-bearing structures was used for theoretical derivations.And the 3D tomography of the transient electromagnetic method(TEM) was used to develop an equivalent conductance method.Based on the improvement of a single prediction technique,we developed a technical system for reliable prediction of geological defective features by analyzing the advantages and disadvantages of all prediction methods.The procedure of the application of this system was introduced in detail.For prediction,the selection of prediction methods is an important and challenging work.The analytic hierarchy process(AHP) was developed for prediction optimization.We applied the newly developed prediction system to several important projects in China,including Hurongxi highway,Jinping II hydropower station,and Kiaochow Bay subsea tunnel.The case studies show that the geological defective features can be successfully detected with good precision and efficiency,and the prediction system is proved to be an effective means to minimize the risks of geological hazards during tunnel construction.  相似文献   

12.
岩石公路隧道塌方风险事故树分析   总被引:12,自引:1,他引:11  
塌方是岩石隧道施工中的常见灾害.总结了岩石公路隧道塌方发生的几大因素及发生机理.利用事故树理论(Fault Tree Analysis,FTA),结合上述因素分析,编制了岩石公路隧道塌方分析事故树,并结合西部某公路隧道工程,对该隧道中潜在塌方因素进行了定量分析,计算得出塌方事故的发生概率、各底事件的关键重要度,提出了相应的管理措施和控制建议.  相似文献   

13.
 通过龙头山隧道、岚峰隧道的现场试验研究和数值分析,提出大断面公路隧道的过程设计方法,并建立应用模型。过程设计方法以荷载–结构法为基础,并以极限拉应变值来确定围岩松动区范围。与传统的公路隧道设计规范、普氏理论等方法相比,设计荷载中重点考虑施工过程的影响,从而在保证隧道安全性的同时优化偏于保守的支护参数。通过双侧壁导坑开挖方法和单侧壁导坑开挖方法这2个应用实例表明:过程设计方法比状态设计方法更为可靠和实用,更符合大断面隧道的实际情况。研究结果将有助于为大断面公路隧道寻求更为有效、合理的设计方法,提高大断面隧道的设计水平。  相似文献   

14.
Since the development of the new Austrian tunnelling method(NATM) in the 1960s,this technique has been applied successfully in many tunnels.However,opinions of NATM principles emerged till 2000,i.e.NATM is not a tunnelling method,but an approach covering all general principles of tunnelling.To investigate the general principles of the NATM,this study focused on tunnelling practises in the Bolu tunnel,and evaluated the conditions under which the NATM practises could be effective.The Bolu tunnel project was designed following the NATM principles.It is evident that practises adopted in this tunnel are important with respect to the NATM.In addition,it shows that the solutions to the problems encountered in this tunnel are consistent with the NATM principles.Finally,the study determines the ground types of the NATM principles and proposes associated updates.  相似文献   

15.
The paper introduces some peculiar and innovative aspects by the experimental tests carried out in a boundary-layer wind tunnel (BLWT) for the design of the roof of the new Olympic soccer stadium in Piraeus, Greece, using simultaneous pressure measurements and state-of-the-art processing techniques. The wind tunnel data are then used for the numerical simulation of the quasi-static response of the structure in the time domain, so obtaining the time histories of the structural response. The extreme values of the wind effects are evaluated directly from the statistical analysis of the corresponding time histories and are compared with those from dead loads. Finally the uniform pressure distributions are identified which produce the same extreme values of wind effects.  相似文献   

16.
陈玲菊 《城市勘测》2015,(1):142-145
针对传统GM(1,1)模型在高铁隧道沉降变形分析与预测中精度不理想状况,本文在传统GM(1,1)模型基础上,建立自适应GM(1,1)模型与残差修正GM(1,1)模型并讨论两种改进模型各自优点。利用传统GM(1,1)模型、自适应GM(1,1)模型以及残差修正GM(1,1)模型对某高铁隧道监测点作沉降分析与预测。通过对比,得出自适应GM(1,1)模型与残差修正GM(1,1)模型对原模型的预测曲线相关性和预测精度有一定程度提高;残差修正GM(1,1)模型对于沉降曲线波动较大处仍有较好的拟合与预测效果,其预测效果优于自适应GM(1,1)模型。  相似文献   

17.
This study presents an application of artificial neural network(ANN) and Bayesian network(BN) for evaluation of jamming risk of the shielded tunnel boring machines(TBMs) in adverse ground conditions such as squeezing grounds.The analysis is based on database of tunneling cases by numerical modeling to evaluate the ground convergence and possibility of machine entrapment.The results of initial numerical analysis were verified in comparison with some case studies.A dataset was established by performing additional numerical modeling of various scenarios based on variation of the most critical parameters affecting shield jamming.This includes compressive strength and deformation modulus of rock mass,tunnel radius,shield length,shield thickness,in situ stresses,depth of over-excavation,and skin friction between shield and rock.Using the dataset,an ANN was trained to predict the contact pressures from a series of ground properties and machine parameters.Furthermore,the continuous and discretized BNs were used to analyze the risk of shield jamming.The results of these two different BN methods are compared to the field observations and summarized in this paper.The developed risk models can estimate the required thrust force in both cases.The BN models can also be used in the cases with incomplete geological and geomechanical properties.  相似文献   

18.
Estimation of tunnel diameter convergence is a very important issue for tunneling construction,especially when the new Austrian tunneling method(NATM) is adopted.For this purpose,a systematic convergence measurement is usually implemented to adjust the design during the whole construction,and consequently deadly hazards can be prevented.In this study,a new fuzzy model capable of predicting the diameter convergences of a high-speed railway tunnel was developed on the basis of adaptive neuro-fuzzy inference system(ANFIS) approach.The proposed model used more than 1 000 datasets collected from two different tunnels,i.e.Daguan tunnel No.2 and Yaojia tunnel No.1,which are part of a tunnel located in Hunan Province,China.Six Takagi-Sugeno fuzzy inference systems were constructed by using subtractive clustering method.The data obtained from Daguan tunnel No.2 were used for model training,while the data from Yaojia tunnel No.1 were employed to evaluate the performance of the model.The input parameters include surrounding rock masses(SRM) rating index,ground engineering conditions(GEC) rating index,tunnel overburden(H),rock density(?),distance between monitoring station and working face(D),and elapsed time(T).The model’s performance was assessed by the variance account for(VAF),root mean square error(RMSE),mean absolute percentage error(MAPE) as well as the coefficient of determination(R2) between measured and predicted data as recommended by many researchers.The results showed excellent prediction accuracy and it was suggested that the proposed model can be used to estimate the tunnel convergence and convergence velocity.  相似文献   

19.
用于泥水盾构隧道的聚合物正电胶泥浆研究   总被引:1,自引:1,他引:0  
通过试验发现聚合物和正电胶(MMH)作为处理剂具有抑制粘土分散、稳定砂土和改善泥浆特性等效果,据此经主要原材料优选试验、造浆率试验、抗污染试验及分散岩屑回收率试验研发了聚合物正电胶泥浆(PMS).在上海复兴东路泥水盾构隧道工程中的应用结果表明:PMS能生成孔隙小、致密性高且厚度大的泥膜,具有良好的实用性及应用前景.  相似文献   

20.
射流风机升压影响的计算机辅助试验仿真分析   总被引:2,自引:0,他引:2  
结合公路隧道纵向通风系统设计方案,运用了CFD(计算流体动力学)方法对射流风机的升压效率影响因素进行三维数值分析,确定了影响射流风机升压效率的主要因素并提出提高射流风机升压效率的措施以供工程设计参考.  相似文献   

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