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271.
During and after the very wet 1991/1992 winter experienced in Jordan, significant instabilities occurred in several sections
of the new Irbid–Amman Highway in Jordan. A potential impact of surface and subsurface flow on the failed areas was noted.
This paper is concerned with a hydrological study of the Irbid–Amman Highway, including watershed characteristics, hydrological
data analysis, and hydraulic analysis of remedial works to failed areas and other parts of the highway drainage to minimize
the impact of surface runoff and the effects of subsurface water with respect to the stability of the upslope and to limit
the porewater pressure within the road formation. The study shows that the culvert capacity and the discharge velocity of
the cross-highway drainage are deficient. Recommendations (e.g. gabion cascades) are therefore suggested to reduce drainage
to the cross highway drainage structures. Grouting is suggested to stabilize the embankments above the inlets to culverts.
Remedial drainage works are suggested for each major failed area. These include: culverts, table drain, drainage blanket beneath
road formation, cut-off drains above cuttings, subsurface drains into the cut in the vicinity of springs, curtain drain beneath
the lined table drain, and others.
Received: 26 March 1997 · Accepted: 23 March 1998 相似文献
272.
273.
274.
钢屈服—摩擦复合耗能器的性能研究 总被引:6,自引:1,他引:5
本文提出了“综合利用不同耗能原理和机制来设计新型耗能器”的思想,研究开发了钢屈服-摩擦复合耗能器,并对其进行了性能试验和对比试验,考察了耗能器的工作性能和耗能性能。给出了耗能器的恢复力模型,研究结果表明,钢屈服-摩擦复合耗能器利用钢屈服滞回和摩擦两种机制耗能,具有稳定的工作性能,耗能能力强且可调节,构造简单,形状紧凑,体积小,造价低,制作与安装方便,是一种有广阔应用前景的新型耗能减震装置。 相似文献
275.
静水压力作用下圆拱正对称失稳临界力的求解 总被引:3,自引:0,他引:3
按Ritz法求得铰支和固支圆拱受静水压力作用时,具有高精度的正对称失稳临界力的第3次近似值。在圆拱临界力的求解中,还可同时导得圆环以不同波数失稳的临界力的精确值。 相似文献
276.
嵌岩桩理论研究和设计中的几个问题 总被引:27,自引:0,他引:27
明确嵌岩桩的定义和分类,对嵌岩桩的承载机理、临界嵌入深度、设计理论和数值模拟方法等问题进行讨论,并对未来的工作进行论述。 相似文献
277.
DING Keqin DUAN Menglan FU Pinsheng LIU Chuntu
Ph. D. Associate Professor Research Department Center of Boiler Pressure Vessel Inspection Research Beijing P. R. China
Ph. D. Research Professor CCS Research Development Center China Classification Society Beijing P. R. China
Lecturer Yumen Petroleum School of Technique Technology Yumen P. R. China Research Professor 《中国海洋工程》1999,(4)
A simple probabilistic model for predicting crack growth behavior under random loading is pre-sented.In the model,the parameters c and m in the Paris-Erdogan Equation are taken as random variables,and their stochastic characteristic values are obtained through fatigue crack propagation tests on an offshorestructural steel under constant amplitude loading.Furthermore,by using the Monte Carlo simulation tech-nique,the fatigue crack propagation life to reach a given crack length is predicted.The tests are conducted toverify the applicability of the theoretical prediction of the fatigue crack propagation. 相似文献
278.
ZHAO Junyou GUO Aiju DING Keqin LIU Chuntu
Lecturer Petroleum University of China Shangdong P. R. China.
Engineer Zhongyuan Petrochemical Corporation Henan P. R. China.
Postdoctoral Fellow 《中国海洋工程》1999,(1)
-This paper carries out the analysis of mechanics of a grip system of three-key-board hydraulictongs developed for offshore oil pipe lines which has been successfully used in oil fields in China.The mainimprovement of this system is that a lever frame structure is used in the structural design,which reducesgreatly the stresses of the major components of the oil pipe tongs.Theoretical analysis and numerical calcu-lation based on thirteen basic equations developed show that the teeth board of the tongs is not easy to slipas frequently happens to other systems and is of higher reliability. 相似文献
279.
280.
The disturbed state concept (DSC) model, and a new and simplified procedure for unloading and reloading behavior are implemented in a nonlinear finite element procedure for dynamic analysis for coupled response of saturated porous materials. The DSC model is used to characterize the cyclic behavior of saturated clays and clay–steel interfaces. In the DSC, the relative intact (RI) behavior is characterized by using the hierarchical single surface (HISS) plasticity model; and the fully adjusted (FA) behavior is modeled by using the critical state concept. The DSC model is validated with respect to laboratory triaxial tests for clay and shear tests for clay‐steel interfaces. The computer procedure is used to predict field behavior of an instrumented pile subjected to cyclic loading. The predictions provide very good correlation with the field data. They also yield improved results compared to those from a HISS model with anisotropic hardening, partly because the DSC model allows for degradation or softening and interface response. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献