CAJ | 학술논문

为了获得不同初始颗粒粒径分布和含水率对层间错动带颗粒破碎和剪切强度特性的影响,通过对比泥夹碎屑、泥夹粉砂、全泥型3种不同层间错动带类型与现场3种不同含水率(10%、7%和3%)试样在法向压力2~10 MPa 作用下的反复直剪试验和剪切面颗粒粒径分析试验结果,可得出以下结论:①粗颗粒越多(d60越大),采用相对颗粒破碎势 Br 量化的颗粒破碎程度越大;②较干颗粒(低含水率)由于磨损产生了更多的细小颗粒,而较湿颗粒(高含水率)由于破裂和摩擦产生了较大颗粒;③粗颗粒仅对峰值抗剪强度产生一定的影响,且粗颗粒越多,残余强度包线非线性越强;④黏聚力和内摩擦角随含水率线性减小,且低含水率试样残余强度包线非线性最强;⑤残余内摩擦角随颗粒破碎后的黏粒含量(<2μm)线性减小.提出的残余内摩擦角初步预测公式可供实际工程参考.
위료획득불동초시과립립경분포화함수솔대층간착동대과립파쇄화전절강도특성적영향,통과대비니협쇄설、니협분사、전니형3충불동층간착동대류형여현장3충불동함수솔(10%、7%화3%)시양재법향압력2~10 MPa 작용하적반복직전시험화전절면과립립경분석시험결과,가득출이하결론:①조과립월다(d60월대),채용상대과립파쇄세 Br 양화적과립파쇄정도월대;②교간과립(저함수솔)유우마손산생료경다적세소과립,이교습과립(고함수솔)유우파렬화마찰산생료교대과립;③조과립부대봉치항전강도산생일정적영향,차조과립월다,잔여강도포선비선성월강;④점취력화내마찰각수함수솔선성감소,차저함수솔시양잔여강도포선비선성최강;⑤잔여내마찰각수과립파쇄후적점립함량(<2μm)선성감소.제출적잔여내마찰각초보예측공식가공실제공정삼고.
The results of the samples with three different types of infilled joint soils (mud with fragment, mud with sand and muddy) and the ones with three different water contents (10% ,7% and 3%)around the in-situ water content by the reversal direct shear tests (normal stress is between 2 MPa and 10 MPa) and particle size distribution (PSD) tests (around the shear zones) were compared to get the effects of the different initial particle size distributions and water contents on the infilled joint soil. Some conclusions are drawn as follows. ①The degree of particle crushing is higher quantified by Br index (relative particle crushing potential) for the coarser particles (d60 is greater). ② Dry particles (lower water content) tend to crush to tiny particles due to abrasion and wet particles (higher water content) generate more relative large particles due to fracture or attribution. ③ Coarse particles have limited effect on the peak strength; besides nonlinearity of residual strength envelope is higher for coarser particles(d60 is greater). ④Cohesion and friction angle decrease linearly with water content; moreover the samples with lower contents have a higher nonlinear residual strength envelope. ⑤ The residual friction angle decreases linearly with clay fraction; in addition, the equation proposed could be used to estimate the residual friction angle of the infilled joint soils preliminarily in practice.