不同試驗種類間不排水剪力強度之關聯性

Abstract

前人研究結果顯示出不同試驗測得之不排水剪力強度s_u有很大的差異，應該選用何種試驗求得最接近現場之不排水剪力強度。不同結構物及載重下造成土壤受力不同，土壤破壞面力學行為類似於試驗為TC、DSS及TE。為了符合現地狀況因此適宜選用CAUC(CK_0UC)、DSS及CAUE此三種試驗求得的不排水剪力強度。 目前工程基於成本及方便性上考量，大都採用VST、UU或UC試驗求取不排水剪力強度，其不排水剪力強度與現地實際s_u值仍有很大差異。影響不排水剪力強度重要因素有不同試驗、OCR及應變速率，因此本研究收集各國家資料，探討不同試驗之s_u、OCR及應變速率之間關係，找出試驗間之關連性及不確定性並求得不排水剪力強度設計參數。

The undrained shear strength s_u of different tests was found that have great differences in accordance with previous research. What is the type of undrained shear strength tests matches the in-situ condition best. Difference structures and load cause soil forced is difference. Failure surface of soil mechanics behavior that is similar to TC、DSS and TE test. For matching in-situ condition chose undrained shear strength of CAUC、DSS and CAUE tests . At present, engineering in view of cost and convenience mostly chose undrained shear strength of VST、UU or UC test that have great differences between in-situ condition. The OCR and strain rate are influencing the undrained shear strength ratio factors except difference tests. For undrained shear strength design parameters, probing into undrained shear strength of different tests、OCR and strain rate relationship with undrained shear strength in Various countries.