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Probabilistic prediction of expected ground condition and construction time and costs in road tunnels 被引量:4
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作者 A.Mahmoodzadeh S.Zare 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2016年第5期734-745,共12页
Ground condition and construction (excavation and support) time and costs are the key factors in decision-making during planning and design phases of a tunnel project. An innovative methodology for probabilistic est... Ground condition and construction (excavation and support) time and costs are the key factors in decision-making during planning and design phases of a tunnel project. An innovative methodology for probabilistic estimation of ground condition and construction time and costs is proposed, which is an integration of the ground prediction approach based on Markov process, and the time and cost variance analysis based on Monte-Carlo (MC) simulation. The former provides the probabilistic description of ground classification along tunnel alignment according to the geological information revealed from geological profile and boreholes. The latter provides the probabilistic description of the expected construction time and costs for each operation according to the survey feedbacks from experts. Then an engineering application to Hamro tunnel is presented to demonstrate how the ground condition and the construction time and costs are estimated in a probabilistic way. In most items, in order to estimate the data needed for this methodology, a number of questionnaires are distributed among the tunneling experts and finally the mean values of the respondents are applied. These facilitate both the owners and the contractors to be aware of the risk that they should carry before construction, and are useful for both tendering and bidding. 展开更多
关键词 Markov process Geological condition Monte-Carlo (MC) simulation construction time and costs Hamro tunnel
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Predictability of well construction time with multivariate probabilistic approach
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作者 LUU Quang-Hung LAU Man Fai +3 位作者 NG Sebastian P.H. TING Clement P.W. WEE Reuben THEN Patrick H.H. 《Petroleum Exploration and Development》 CSCD 2021年第4期987-998,共12页
Current univariate approach to predict the probability of well construction time has limited accuracy due to the fact that it ignores key factors affecting the time.In this study,we propose a multivariate probabilisti... Current univariate approach to predict the probability of well construction time has limited accuracy due to the fact that it ignores key factors affecting the time.In this study,we propose a multivariate probabilistic approach to predict the risks of well construction time.It takes advantage of an extended multi-dimensional Bernacchia–Pigolotti kernel density estimation technique and combines probability distributions by means of Monte-Carlo simulations to establish a depth-dependent probabilistic model.This method is applied to predict the durations of drilling phases of 192 wells,most of which are located in the AustraliaAsia region.Despite the challenge of gappy records,our model shows an excellent statistical agreement with the observed data.Our results suggested that the total time is longer than the trouble-free time by at least 4 days,and at most 12 days within the 10%–90% confidence interval.This model allows us to derive the likelihoods of duration for each phase at a certain depth and to generate inputs for training data-driven models,facilitating evaluation and prediction of the risks of an entire drilling operation. 展开更多
关键词 well construction time multivariate probabilistic modelling probabilistic approach Markov Chain Monte-Carlo
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Quick Construction of Profitable Elaborate WCDMA Network in 3G Times
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作者 Chen Yong (Mobile Division of ZTE Corporation, Shanghai 201203, China) 《ZTE Communications》 2005年第2期34-36,共3页
关键词 WCDMA Quick construction of Profitable Elaborate WCDMA Network in 3G times
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侗族原生性生存空间与族群生命共同体的统合
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作者 张泽忠 《河池学院学报》 2013年第3期38-43,48,共7页
侗族自称"干"(侗语指"用树枝木栅把栖居之所遮掩起来")。侗族聚居地古属牂牁夜郎地。侗族原生性环境空间与族群生命共同体的统合及其适时建构性特质的形成,渊源于"干"族群的生存观念基础及其传统文化认... 侗族自称"干"(侗语指"用树枝木栅把栖居之所遮掩起来")。侗族聚居地古属牂牁夜郎地。侗族原生性环境空间与族群生命共同体的统合及其适时建构性特质的形成,渊源于"干"族群的生存观念基础及其传统文化认知行为。人类学、民族学"原生论"与"建构论"从民族和民族主义理论的两端相对性的或强调民族是"原生的",或强调民族是"建构的",两者各持一端,互为抵牾。"干"族群文化自我深层结构中的统合性因素表明,"原生性"与"建构性"既互为相向,又互为指认和互为通约;即文明进程中,"干"族群原生性生存空间的绵延与族群生命共同体的统合,始基于传统因素即统合性因素的延伸性整合及其与日俱化的适时建构性。 展开更多
关键词 环境空间 族群共同体 统合性因素 原生性 适时建构性
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Bending behavior of double-row stabilizing piles with constructional time delay 被引量:11
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作者 Yang YU Yue-quan SHANG Hong-yue SUN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2012年第8期596-609,共14页
The bending behavior of double-row stabilizing plies is associated with the constructional time delay(CTD),which can be defined as the time interval between the installations of the front stabilizing pile and the rear... The bending behavior of double-row stabilizing plies is associated with the constructional time delay(CTD),which can be defined as the time interval between the installations of the front stabilizing pile and the rear stabilizing pile.This paper investigates the effect of CTD on the bending moments of double-row stabilizing piles and a method for determining the optimal CTD is proposed.The stabilizing pile is modeled as a cantilever pile embedded in the Winkler elastic foundation.A triangular distributed earth pressure is assumed on the pile segment in the sliding layer.The front stabilizing pile and the rear stabilizing pile are connected by a beam with pinned joints.The analytical solutions of bending moments on the front and the rear stabilizing piles are derived and the accuracy of bending moment solutions is validated by comparing the tensile strain measured from the Hongyan landslide project,Taizhou,Zhejiang,China.It is concluded that CTD has a significant influence on the bending moments of double-row stabilizing piles.An optimal CTD can be obtained when the maximum tensile stress in the front stabilizing pile is equal to that in the rear stabilizing pile,which is 1.4 months for the Hongyan landslide project. 展开更多
关键词 Subgrade reaction LANDSLIDE Stabilizing pile constructional time delay (CTD) Bending moment
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Acoustic emission monitoring of rockbursts during TBM-excavated headrace tunneling at Jinping Ⅱ hydropower station 被引量:6
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作者 Wuwei Cheng Wenyou Wang +1 位作者 Shiqiang Huang Peng Ma 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2013年第6期486-494,共9页
To better understand the mechanical properties of marble at Jinping II hydropower station, this paper examines the changes of brittle rocks in excavation damaged zones(EDZs) before and after excavation of tunnel with ... To better understand the mechanical properties of marble at Jinping II hydropower station, this paper examines the changes of brittle rocks in excavation damaged zones(EDZs) before and after excavation of tunnel with the tunnel boring machine(TBM). The paper attempts to employ the acoustic emission(AE) to study the AE characteristics and distribution of rockburst before and after TBM-excavated tunnel. It is known that the headrace tunnel #2, excavated by the drill-and-blast(D&B) method, is ahead of the headrace tunnel #3 that is excavated by TBM method. The experimental sub-tunnel #2–1, about 2000 m in depth and 13 m in diameter, between the two tunnels is scheduled. In the experimental sub-tunnel #2–1, a large number of experimental boreholes are arranged, and AE sensors are installed within 10 m apart from the wall of the headrace tunnel #3. By tracking the microseismic signals in rocks, the location, frequency, quantity, scope and intensity of the microseismic signals are basically identifed. It is observed that the AE signals mainly occur within 5 m around the rock wall, basically lasting for one day before tunnel excavation and a week after excavation. Monitoring results indicate that the rockburst signals are closely related to rock stress adjustment. The rock structure has a rapid self-adjustment capacity before and after a certain period of time during tunneling. The variations of rock stresses would last for a long time before reaching a fnal steady state. Based on this, the site-specifc support parameters for the deep tunnels can be accordingly optimized. 展开更多
关键词 Acoustic emission(AE) monitoring Tunnel construction Microseismic event Relaxation time Rockbursts
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Effect of Various Alumina Powders on Properties of Castables
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作者 SONG Yanan WEI Guoping +7 位作者 CHEN Qin SHUAI Hang LIU Guangping SHEN Mingke CHEN Yaosheng YU Yan WANG Yulong CAO Yaping 《China's Refractories》 CAS 2022年第2期45-48,共4页
To satisfy the requirements of alumina castables in specific environment and enhance their properties,alumina castables were prepared using tabular alumina,various alumina powders(07RAL,15RA,22RABL,40CA,99-20um,and 99... To satisfy the requirements of alumina castables in specific environment and enhance their properties,alumina castables were prepared using tabular alumina,various alumina powders(07RAL,15RA,22RABL,40CA,99-20um,and 99-325mesh),and calcium aluminate cement as main raw materials,and heat treating at 110,1000,1600℃,respectively.Their flowability and physical properties were tested,and the morphology was researched.The results show that compared with calcined alumina and tabular alumina powders,reactive alumina has higher specific surface area and better filling performance leading to lower water demand and higher viscosity,and the castables prepared with reactive alumina have higher CCS and CMOR after heat treating at 110,1000 and 1600℃as well as lower PLC than those with calcined alumina and tabular alumina powders. 展开更多
关键词 alumina powder CASTABLES rheological property construction time sintering performance
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Gas field construction on time
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《China City Planning Review》 1994年第1期26-26,共1页
About one--fOurth of the con- sery’e capacity at l00 billion cubic me-struction on China’s largest off shore tres.drilling field is now complete. and en- By January 30. more than 240gineers say the projcct is on sch... About one--fOurth of the con- sery’e capacity at l00 billion cubic me-struction on China’s largest off shore tres.drilling field is now complete. and en- By January 30. more than 240gineers say the projcct is on schedule kilo1netres ol’ underu:ater pipelinestbr opening January l. l996. u:ere laid. about one fourth of the to-The Ya l3-- l Gas Field in the ta1. according yesterday’s o\’erseas edi-South Chlna Sea wiIl suppl} Hong tion or People’s Dall}’.Kong and Hainan Province w’ith natu- Exentually tuo underuaterral gas. Estimates put the tield’s re- pipeIInes ’’iIl he constructedt one. 展开更多
关键词 Gas field construction on time THAN
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新构式主义视角下汉语事件结构中的时量短语
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作者 王晨 《语言学研究》 2021年第2期98-111,共14页
本文在新构式主义视角下讨论汉语事件结构中的时量短语在句法推导中的作用。本文认为时量词具有整量词的特征,因此在DP中占据核心位置,名词通过“的”与时量词连接。时量短语整体合并于内时体标示词,以时间长度衡量事件体量。但在一些... 本文在新构式主义视角下讨论汉语事件结构中的时量短语在句法推导中的作用。本文认为时量词具有整量词的特征,因此在DP中占据核心位置,名词通过“的”与时量词连接。时量短语整体合并于内时体标示词,以时间长度衡量事件体量。但在一些情况下时量词和名词可以分置于两处,时量词变成动词的补充,由名词界定事件的体量。本文分析指出,动词和宾语在句法上未必具有严格的选择关系,表面上差异明显的成分在句法上可能占据相同的位置,在事件结构中起类似的作用。 展开更多
关键词 句法 事件结构 时量短语 新构式主义 整量词
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