SGER: Failure of Teton Dam: A New Theory

0234103，华盛顿州立大学巴拉辛加姆·穆洪坦，《泰顿大坝的失败：一种新的理论》这项研究的目的是验证一种关于蒂顿大坝失败的新理论。爱达荷州的蒂顿大坝在1976年6月5日的第一次蓄水过程中失败。它造成了14人死亡和非常大的经济损失。它的失败是近年来涉及大型土坝的最广为人知的事件之一。这座大坝是按照现代标准设计和建造的；因此，它的失败受到了工程专家的极大关注。然而，包括独立小组(IP)和内部审查小组(IRG)在内的专家对故障的评估和预测未能达成共识。提出的破坏机制包括水力破裂、内部侵蚀、湿煤层理论和坝肩岩石缺陷。然而，没有一项调查能够令人满意地解释当水库到达El时大坝决口的原因。5301.7英尺，只在Sta附近。右基台15+00。这项调查是基于基础的“状态土力学”的初步工作。结果表明，洞心(-1区)至EL.5300英尺处存在一条深裂隙(S)，最深的裂隙(S)仅出现在右桥台及坝段附近。14+00到15+00。当水库上升到艾尔湖以上时。1976年6月5日凌晨5300英尺，水通过敞开的横向垂直裂缝(S)流入位于El基岩上的渗透性下游2区。5200英尺水流慢慢地侵蚀着裂缝进入一条大隧道，导致几个小时后大坝的重大决口。这项初步工作是基于临界状态土力学框架进行的。它假定土体的力学行为，如压缩性、孔压响应、关于屈服、破裂和断裂的剪切行为，取决于Q-P-E(剪应力-平均应力-孔隙比)空间或等效的Li-P(流动性指数-平均应力)空间中的“土的状态”。计划结束时将举行为期一天的研讨会，一个专家小组将在会上与调查人员会面，审查研究结果，并根据过去对Teton失败的调查提出批评。专家委员会将包括来自美国垦荒局、美国陆军工程兵团的专业人士和学者。讲习班的会议记录，以及对蒂顿大坝破坏的详细分析和建议，将通过全球网络传播。

0234103, Balasingam Muhunthan, Washington State University"Failure of the Teton Dam: A New Theory"The objective of this research is to verify a new theory regarding the failure of the Teton Dam. The Teton Dam, in Idaho, failed during its first filling on 5 June 1976. It resulted in 14 fatalities and a very large economic loss. Its failure was one of the most publicized events involving a large earth fill dam in recent times. The dam was designed and built using modern standards; therefore its failure received considerable attention from engineering experts. However the failure assessment and prognosis by experts, including the Independent Panel (IP) and the Interior Review Group (IRG), failed to arrive at a consensus. Failure mechanisms suggested, included hydraulic fracture, internal erosion, the wet-seam theory, and defects in the abutment rock. None of the investigations, however, was able to explain satisfactorily why the dam breached when the reservoir reached El. 5301.7 ft and only in the vicinity of Sta. 15+00 on the right abutment. This investigation is based on a preliminary work using fundamental "state based soil mechanics". It indicates that a deep open transverse vertical crack(s) existed in the core (Zone-1) to EL.5300 ft and the deepest crack(s) occurred only in the right abutment and in the vicinity of Sta. 14+00 to Sta.15+00. When the reservoir rose above El. 5300 ft in the early hours of 5 June 1976, water flowed through the open transverse vertical crack(s) into the pervious downstream Zone-2, which was seated on bedrock at El. 5200 ft. The water flow slowly eroded the crack into a large tunnel leading to the major breach of the dam hours later. This preliminary work is based on the critical state soil mechanics framework. It assumes that the mechanical behavior of soils, such as the compressibility, pore pressure response, shear behavior with respect to yield, rupture and fracture, is dependent on the "state of soil" in q-p-e (shear stress-mean stress-void ratio) space or equivalently the LI - p (Liquidity Index - mean stress) space. A one-day workshop will be held at the conclusion of the program, at which a panel of experts will meet with the investigators to examine the research results and provide a critique in light of past investigations of the Teton failure. The expert committee will include professionals from the US Bureau of Reclamation, the US Army Corps of Engineers, and academics. The proceedings of the workshop, along with a detailed analysis of the Teton Dam failure and recommendations, will be disseminated via the worldwide web.