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钻孔灌注长桩试验曲线型式及破坏机理探讨

铁道学报 1998年第4期20卷 93-97页

作者：黄明聪龚晓南赵善锐浙江大学西南交通大学

根据百余根钻孔灌注桩现场静载试验资料［１］，总结了钻孔灌注长桩的静载试验曲线（荷载Ｐ、沉降Ｓ、时间ｔ）的主要类型及其特征；讨论与之相关的破坏规律和极限承载力判定方法、影响因素；提出根据桩长和长径比判定为长桩的大致标准... 详细信息

根据百余根钻孔灌注桩现场静载试验资料［１］，总结了钻孔灌注长桩的静载试验曲线（荷载Ｐ、沉降Ｓ、时间ｔ）的主要类型及其特征；讨论与之相关的破坏规律和极限承载力判定方法、影响因素；提出根据桩长和长径比判定为长桩的大致标准；就长桩的合理尺寸和沉降控制提出新的看法和建议。

关键词：钻孔灌注长桩试验曲线破坏机理静载试验

Dynamic behavior of laterally loaded caisson foundations based on different cushion types: an experimental and theoretical study

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Journal of Zhejiang university-Science A(Applied Physics & engineering) 2020年第7期21卷 565-579页

作者： Wen-bo TU mao-song HUANG Xiao-qiang GU School of Civil engineering and Architecture East China Jiaotong UniversityNanchang 330013China department of geotechnical engineering Tongji UniversityShanghai 200092China Key Laboratory of geotechnical and underground engineering of Ministry of Education Tongji UniversityShanghai 200092China

Bridge foundations located in deep water are usually subjected to horizontal dynamic loads and moments which may be caused by the wind, waves, earthquake, and the possibility of boat crashing or vehicle braking. Caisson foundations based on gravel or sand cushions are a new type of deep-water foundation for bridges, suitable for meizoseismal areas. In this paper, harmonic horizontal excitation tests for the study of the lateral dynamic response of caisson foundations based on cushion layers are described. Different lateral loads and two different cushion types are considered. The results show that the lateral dynamic responses of caisson foundations based on sand and gravel cushions both show strong nonlinear characteristics, and the resonant frequency of the foundation decreases with the increase of the excitation force. The dynamic displacement of a foundation based on a sand cushion is far less than that based on a gravel cushion, and the rate of decrease of the resonant frequency of a foundation based on a gravel cushion is faster than that of a foundation based on a sand cushion under the same conditions. Under dynamic loading the gravel cushion can more effectively dissipate vibration energy and isolate the vibration, than the sand cushion can. A simplified nonlinear analysis method is proposed to simulate the lateral dynamic response of caisson foundations, and the predicted response shows a reasonable match with the results observed in laboratory tests. Scaling laws have also been applied in this small-scale vibration model test to predict the dynamic behavior of the prototype foundation.

关键词： Nonlinear dynamic response Caisson foundation Harmonic vibration test Gravel cushion Sand cushion

基于微震监测与DFN模拟的金川水电站尾闸室破坏机制

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隧道与地下工程灾害防治 2024年第3期6卷 60-72页

作者：皮锦添徐奴文张丰收毛浩宇周相李怀良薄雾四川大学山区河流保护与治理全国重点实验室四川成都610065 同济大学土木工程学院地下建筑与工程系上海200092 国电大渡河流域水电开发有限公司四川成都610041 成都理工大学地质灾害防治与地质环境保护国家重点实验室四川成都610059 西藏大学工学院西藏拉萨850000

为获取金川水电站受碳质千枚岩带影响下尾闸室围岩破坏机制,在施工期构建微震监测系统,获取地下洞室开挖过程微震事件时空分布规律和震源参数信息,同时建立三维离散元数值模型,针对地下厂房软弱断层使用离散裂隙网络(discrete fracture ... 详细信息

为获取金川水电站受碳质千枚岩带影响下尾闸室围岩破坏机制,在施工期构建微震监测系统,获取地下洞室开挖过程微震事件时空分布规律和震源参数信息,同时建立三维离散元数值模型,针对地下厂房软弱断层使用离散裂隙网络(discrete fracture network,DFN)方法构建节理裂隙,综合获取地下洞室位移场和塑性破坏区分布规律,揭示地下洞室围岩破坏机理,基于数值模拟获得开挖过程诱发的合成微震事件,对软弱断层破坏模式和损伤程度进行研究。结果表明:微震事件空间分布特征与围岩破坏区域一致;横纵波能量比揭示了尾闸室破坏模式主要为张拉破坏;通过离散元数值模拟获得最大变形区域和塑性破坏区,计算结果与微震监测结果相互印证;DFN-离散元耦合方法生成的合成微震事件揭示了围岩潜在破坏区域,其结果与实际的微震事件空间分布较为吻合。

关键词：地下洞室微震监测离散元法离散裂隙网络合成微震事件

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承压水越流对地下结构浮力影响试验研究

岩土工程学报 2019年第4期41卷 769-774页

作者：木林隆王乐黄茂松何彦承康景文同济大学岩土与地下工程教育部重点实验室上海200092 同济大学地下建筑与工程系上海200092 中国建筑西南勘察设计研究院有限公司四川成都610000

针对承压水地层中地下结构受到浮力预测不准确的问题,开展存在地下结构的土层中竖向渗流模型试验,考察不同环境中的承压水渗流对地下结构的浮力影响。主要探讨不同水力梯度下均质土层中竖向渗流及承压水向上穿越弱透水层渗流时,所产生... 详细信息

针对承压水地层中地下结构受到浮力预测不准确的问题,开展存在地下结构的土层中竖向渗流模型试验,考察不同环境中的承压水渗流对地下结构的浮力影响。主要探讨不同水力梯度下均质土层中竖向渗流及承压水向上穿越弱透水层渗流时,所产生的孔隙水压力变化规律及其对地下结构的浮力的影响特点。试验表明:存在渗流时,土中孔压分布和地下结构浮力与静水压力不符;均质土中竖向渗流时,孔压和浮力较同深度理论值的提升比例与竖向水力梯度成正比;承压水在上覆弱透水层中渗流时,弱透水层中孔压和浮力的提升比例要大于强透水层,且土分层界面处孔压和浮力的提升比例最大,约为2倍的水力梯度。

关键词：地下结构承压水渗流浮力孔隙压力

基于临近桩基保护要求的基坑变形控制指标研究

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岩土工程学报 2021年第3期43卷 465-470页

作者：木林隆朱孟玺黄茂松康景文纪智超余行同济大学岩土及地下工程教育部重点实验室上海200092 同济大学地下建筑与工程系上海200092 中国建筑西南勘察设计研究院有限公司四川成都610000 中铁第四勘察设计院集团有限公司湖北武汉430063

基坑开挖对临近桩基的保护一直是基坑工程的难题之一,控制围护墙变形是防止临近桩基破坏的最主要措施,而目前对于围护墙的变形控制标准主要是来源于统计结果,并不能反映临近桩基的变形承受能力。通过基于位移控制的基坑开挖对临近桩基... 详细信息

基坑开挖对临近桩基的保护一直是基坑工程的难题之一,控制围护墙变形是防止临近桩基破坏的最主要措施,而目前对于围护墙的变形控制标准主要是来源于统计结果,并不能反映临近桩基的变形承受能力。通过基于位移控制的基坑开挖对临近桩基础影响两阶段分析方法,建立基坑围护墙变形与桩基变形的关系,并进一步通过对基坑与桩基的主要相关参数分析提出了变形影响因子。在此基础上,基于临近桩基础角变形控制要求,提出了基坑围护墙最大水平变形的控制指标与经济指标。

关键词：基坑开挖允许变形桩基保护控制标准

CEPC Technical Design Report

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Radiation Detection Technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai Yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-Jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai Huacheng Cai Lorenzo Calibbi Junsong Cang Guofu Cao Jianshe Cao Antoine Chance Xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin Chen Danping Chen Fuqing Chen Fusan Chen Gang Chen Guoming Chen Hua-Xing Chen Huirun Chen Jinhui Chen Ji-Yuan Chen Kai Chen Mali Chen Mingjun Chen Mingshui Chen Ning Chen Shanhong Chen Shanzhen Chen Shao-Long Chen Shaomin Chen Shiqiang Chen Tianlu Chen Wei Chen Xiang Chen Xiaoyu Chen Xin Chen Xun Chen Xurong Chen Ye Chen Ying Chen Yukai Chen Zelin Chen Zilin Chen Gang Chen Boping Chen Chunhui Chen Hok Chuen Cheng Huajie Cheng Shan Cheng Tongguang Cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi Ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev Tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong Jianin AGH university of Science and Technology Faculty of Physics and Applied Computer ScienceKrakow Anhui university HefeiAnhui Applied Physics department Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu university Institute of ScienceVaranasi Bandirma Onyedi Eylul university Bandirma Beihang university Beijing Beijing Computational Science Research Center Beijing Beijing Conveyi LTD Beijing Beijing Glass Research Institute Co. LtdBeijing Beijing Institute of Technology Beijing Beijing Normal university Beijing Brown university ProvidenceRI Budker Institute of Nuclear Physics Novosibirsk Cadi Ayyad university Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech Cairo university Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central china Normal university WuhanHubei Central South university ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan china academy of engineering physics MianyangSichuan china building materials academy Beijing china Center of Advanced Science and Technology Beijing china Institute of Atomic Energy Beijing china Jiliang university HangzhouZhejiang china Nuclear Instrument CO. LTDBeijing china university of Geosciences Beijing china university of Geosciences WuhanHubei china university of Mining and Technology XuzhouJiangsu china West Normal university NanchongSichuan Chongqing university Department of PhysicsChongqing Chulalongkorn university Bangkok City university of Hong Kong Department of PhysicsHong Kong Cockcroft Institute Daresbury Cornell university IthacaNY CPPM(AMU/IPhU&CNRS/INP) Marseille Dalian Minzu university DalianLiaoning Dalian university of Technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov Laboratory of Nuclear Problems of Joint Institute for Nuclear Research(DLNP JINR) Dubna East china university Of Science And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by china,fostered through extensive collaboration with international *** complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2015)and the Conceptual Design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection *** is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2030s.

关键词： initiated exceeding precise