已知地基中一点的大小主应力为<img src="https://nimg.ppkao.com/2018-07/yuanhao/2018072017235266508.jpg?sign=531824fa1bb661323d71091f76b34b3f&t=62d1ee3f" />，<img src="https://nimg.ppkao.com/2018-07/yuanhao/2018072017235767812.jpg?sign=4914f5e0c12bcff27ec4eb9091d9a909&t=62d1ee3f" />，土的强度指标<img src="https://nimg.ppkao.com/2018-07/yuanhao/2018072017240578053.jpg?sign=a78e35370a29d59f88948dcced48391a&t=62d1ee3f" />，<img src="https://nimg.ppkao.com/2018-07/yuanhao/2018072017241073099.jpg?sign=fdeb5575a76db8b18fce8dc1fdd1cd07&t=62d1ee3f" />，试判断该点是否会剪破？剪破面与大主应力之间的夹角为多少？