CAJ | 학술논문

直剪试验具有方便、经济的优点，被广泛应用，提高直剪试验数据的可靠性具有重要意义。在总结前人研究成果的基础上，将直剪试验结果数据的修正分为2类：单点面积修正方法和多点面积修正方法。通过简化受剪切土体受力物理模型，提出基于面积修正和正应力修正的单点面积应力修正方法。结果表明：该方法是有效、可靠的，修正后的强度指标要大于其他2种方法，并且对3种方法的实际运用进行简单探讨。在推导过程中，提出面积修正系数和正应力修正系数。修正系数结果表明：随着剪切位移的增加，有效剪切面上的剪应力大于实测值；有效剪切面积上的正应力小于施加的竖向应力，并且随着剪切位移的增加而逐渐减小；非有效剪切面上的正应力呈逐渐增大趋势。由于直剪试验本身的缺陷，使得其修正后的强度参数与三轴试验结果存在一定差别。提出的单点面积应力修正方法提高了利用直剪试验获取土体抗剪强度参数的可靠性和准确性。
직전시험구유방편、경제적우점，피엄범응용，제고직전시험수거적가고성구유중요의의。재총결전인연구성과적기출상，장직전시험결과수거적수정분위2류：단점면적수정방법화다점면적수정방법。통과간화수전절토체수력물리모형，제출기우면적수정화정응력수정적단점면적응력수정방법。결과표명：해방법시유효、가고적，수정후적강도지표요대우기타2충방법，병차대3충방법적실제운용진행간단탐토。재추도과정중，제출면적수정계수화정응력수정계수。수정계수결과표명：수착전절위이적증가，유효전절면상적전응력대우실측치；유효전절면적상적정응력소우시가적수향응력，병차수착전절위이적증가이축점감소；비유효전절면상적정응력정축점증대추세。유우직전시험본신적결함，사득기수정후적강도삼수여삼축시험결과존재일정차별。제출적단점면적응력수정방법제고료이용직전시험획취토체항전강도삼수적가고성화준학성。
The direct shear test(DST) is widely used because of its convenience and economy. It is of great significance to improve the reliability of the DST data. Based on the summary of former test results,the DST data correction is divide into two types,single-point area correction method and multipoint area correction method. By simplifying the force analysis model of shearing soil,an area-stress correction(ASC) method is presented. The results show that this method is effective and reliable. The corrected strength parameters are more than those of other two methods. A simple discussion on the practical application of these methods is done. In the derivation process,the area correction coefficient and the normal stress correction coefficient are put forward. The correction coefficients of ASC show that the shear stress on the effective shear plane is greater than the measured results;and the normal stress on the effective shear area is less than the applied vertical stress with the shear displacement increasing. The normal stress on the non-effective shear plane is increasing. Since the disadvantages and defects of the DST,there are some differences between the corrected strength parameters and those of triaxial test. The mathematical analysis and test results indicate that ASC method is effective and reliable. It improves the accuracy of soil shear strength parameters obtained from DST.